CN100513006C - Process of preparing starch adesive for casting - Google Patents
Process of preparing starch adesive for casting Download PDFInfo
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- CN100513006C CN100513006C CNB2006101353311A CN200610135331A CN100513006C CN 100513006 C CN100513006 C CN 100513006C CN B2006101353311 A CNB2006101353311 A CN B2006101353311A CN 200610135331 A CN200610135331 A CN 200610135331A CN 100513006 C CN100513006 C CN 100513006C
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Abstract
The present invention is process of preparing starch adhesive for casting. The starch adhesive for casting is prepared with gelatinized starch and inorganic bentonite as basic material and through organizing, intercalating and adding proper amount of supplementary material. The preparation process includes the steps of organizing bentonite, organizing gelatinized starch and mixing. The present invention has the advantages of high product strength, high product performance, low cost, low power consumption and environment friendship, and the product is used in replacing mixed fatty oil or resin sand in casting.
Description
Technical field
The present invention relates to a kind of preparation method of binding agent, be specifically related to a kind of method for preparing starch adesive for casting.
Background technology
Binder for casting and operation technique thereof then are the principal elements that influences sand casting production environment and casting mold and core sand performance, and binder for casting is different from the binding agent of other purposes, the requirement of its uniqueness is arranged again at its performance, economy, environment aspects, so according to the requirement of casting binder, develop the casting binder of novel nontoxic pollution-free, high comprehensive performance and moulding thereof, core manufacturing craft is imperative.Traditional binder for casting such as resin, tung oil, waterglass etc. all have advantage and range of application separately, but also all exist the cost of some problems such as resin higher, the sand mulling craft complexity produces the strong and stimulating toxic gas when moulding and cast, thereby causes environmental pollution; Sodium silicate sand collapsibility, reuse are poor; The resource-constrained of tung oil, restricting their development and application, therefore, the common recognition that development is pollution-free, low-cost, binding agent that have good collapsibility has become founder author. casting has then been complied with the developments of casting binder with the research of starch main binder (based on the binding agent of starch).Certainly, starch adesive and foundary industry use other is inorganic, organic binder bond is similar, also exist the shortcoming of oneself, promptly therefore low, the moisture-proof difference of specific strength etc. looks back the research overview of summing up starch adesive for casting, inquire into its research direction, be expected to starch conversion industry is combined with foundary industry, can improve starch structure, enlarge the range of application of modified starch, can improve the foundary industry pollution again and promote China's industrial expansion, be highly significant.
Summary of the invention
The present invention seeks to solve existing starch as binding agent, intensity is low, processing performance is poor, can not be used for the defective of the making of mud core, and the method for preparing starch adesive for casting that a kind of preparation technology is simple, adhesive strength is high, processing performance is good is provided.
The method that the present invention prepares starch adesive for casting is:
1.: bentonite organises
Be under 75 ℃～85 ℃ the condition, organic modifiers to be mixed with 100mmol/100g～110mmol/100g ratio with inorganic bentonite in temperature, the reaction that under stirring condition, organises, behind stirring reaction 1～3h, centrifugal washing;
With the wet organoclay after the washing, progressively adding the intercalator that helps of dissolving in advance while stirring, adding to help intercalator solution and bentonite weight proportion be 0.8: 1.0～1.0: 1.0, stirring keeps, the stirring reaction time is 1～3h, will make the thing stand for standby use;
2.: gelatinized starch organises
Starch is scattered in the cold water, under stirring condition, when progressively being warmed to 75 ℃～85 ℃, starch becomes gelatinized starch mucus: under this temperature, slowly add the intercalator that helps of dissolving in advance, gelatinized starch is 1: 0.7～1: 1 with helping the weight proportion of intercalator solution, and stirring keeps, the stirring reaction time is 1～3h, will make the thing stand for standby use;
3.: make starch adesive
2. 1. step is made thing and step makes thing and left standstill respectively 8～12h hour;
Under the condition of 70 ℃～80 ℃ of temperature, 2. 1. step is made thing and step makes thing and mixes with 1: 9～3: 7 ratios, after stirring 1～3h, pour evaporimeter into, evaporimeter sent in the drier under 40 ℃～50 ℃ the condition of arbitrary vacuum dry, dry back obtains thing and is screened to 100～150 orders in the grinder fragmentation, makes starch adesive for casting.
Because following modification theory: I is bentonitic to organise: experiment adopts the polyhydroxy organic amine salt to do the intercalator modified alta-mud, thereby increase the hydroxy density of bentonite lamella, impel bentonite to produce stronger active force, increase the compatibility of itself and starch by hydrogen bond.The preparation of II organobentonite/starch compound binding agent: sterically hindered big owing to starch molecular structure is helical form and contains glucose unit, be difficult to enter soil layer during the organobentonite blend.Adopt polyvinyl alcohol as helping intercalator, be that polyvinyl alcohol is the big molecule of polyhydroxy straight chain on the one hand, sterically hindered little, can contact with the bentonite superficial layer, and form hydrogen bond between the hydroxyl of organic modifiers, strong interaction energy makes polyvinyl alcohol enter soil layer and even peels off bentonitic lamella. on the other hand, polyvinyl alcohol and starch have certain compatibility, improve the dispersiveness of bentonite in starch, may form the nano composite material of starch base.
The present invention has significant advantage:
1. the intensity height of product, good combination property.
2. cost is low.Its low price is equivalent to the present fatty oil that closes, and it is few 1/3 that amount ratio closes fatty oil, and the price of closing fatty oil goes up gradually, and starch is agricultural product, and its price is lower.
3. practical.Starch is as its technology and pattern assembly of binder for casting, and equipment is the same with compound grease sand, makees binding agent if be originally with closing fatty oil.Use starch now instead and make binding agent, all technologies, tooling device does not all change; Do not have harsh requirement for roughing sand, do not need dry sand, more do not need washed-out sand, any thickness and dihedral coefficient, the sand of clay content all can be used;
4. compliance with environmental protection requirements.Raw material are inorganic bentonite and starch, all are the materials of environmental protection, and the modifier of adding also is nontoxic, and the binding agent that makes finds no malicious element and exists through chemical analysis.Economize 1/3 the energy than closing fat sand, it is the binding agent of the friendly type of environmental protection that oven dry, cast are sent gas nonpoisonous and tasteless.
The specific embodiment
1.: bentonite organises
Be under 75 ℃～85 ℃ the condition, organic modifiers to be mixed with 100mmol/100g～110mmol/100g ratio with inorganic bentonite in temperature, the reaction that under stirring condition, organises, behind stirring reaction 1～3h, centrifugal washing; With the wet organoclay after the washing, progressively adding the intercalator that helps of dissolving in advance while stirring, adding to help intercalator solution and bentonite weight proportion be 0.8: 1.0～1.0: 1.0, stirring keeps, the stirring reaction time is 1～3h, will make the thing stand for standby use.
2.: gelatinized starch organises
Starch is scattered in the cold water, under stirring condition, when progressively being warmed to 75 ℃～85 ℃, starch becomes gelatinized starch mucus: under this temperature, slowly add the intercalator that helps of dissolving in advance, gelatinized starch is 1: 0.7～1: 1 with helping the weight proportion of intercalator solution, and stirring keeps, the stirring reaction time is 1～3h, will make the thing stand for standby use;
3.: make starch adesive
2. 1. step is made thing and step makes thing and left standstill respectively 8～12h hour; Under the condition of 70 ℃～80 ℃ of temperature, 2. 1. step is made thing and step makes thing and mixes with 1: 9～3: 7 ratios, after stirring 1～3h, pour evaporimeter into, evaporimeter sent in the drier under 40 ℃～50 ℃ the condition of arbitrary vacuum dry, dry back obtains thing and is screened to 100～150 orders in the grinder fragmentation, makes starch adesive for casting.
Wherein, helping intercalator is that concentration is 10% poly-vinyl alcohol solution; Organic modifiers is triethanolamine or Pehanorm salt; Gelatinized starch is one or more in tapioca, cornstarch and the glutinous rice starch; Starch adesive for casting adds water, silica sand and other additives in use, promptly gets core sand after the mulling and is used for coremaking.
Embodiment
(1) raw material: the source of inorganic bentonite: Liancheng County, Longyan, Fujian Province;
The source of starch: tapioca: Fujian province the Northwest, Guangxi province, southwestern various places;
Cornstarch: each province, northeast
(2) concrete preparation method's step is as follows:
1. guaranteeing that heating-up temperature is under 80 ℃, with inorganic bentonite 100 grams～120 grams and triethanolamine 90～105 grams, reaction 2～3h that (rotating speed: per minute 80 changes) organises under stirring condition, centrifugal then washing.
2. guaranteeing that heating-up temperature is under 80 ℃ the situation, progressively add the polyvinyl alcohol that has dissolved while stirring, its concentration is 10%80mL, keeps to stir 2～3h;
3. guaranteeing that heating-up temperature is under 80 ℃ the situation, add while stirring tapioca 100 grams be scattered in carry out gelatinization in the water after, slowly add the polyvinyl alcohol 75mL that has dissolved again, keep and stir 1～2h;
4. will be 2., 3. leave standstill 8～10h respectively;
5. guaranteeing that heating-up temperature is under 80 ℃, will be 2., 3. press tapioca: organobentonite=8: 2 (mass ratio) preparation mix stir 2h after, pour evaporimeter into, in 40 ℃～50 ℃ vacuum drying, fragmentation, 100～150 orders that sieve make starch adesive for casting.Time spent adds water, silica sand and other additives, promptly gets core sand after the mulling and is used for coremaking.
This product is mainly used in Foundry Works and makes mud core binding agent usefulness.
The product occupation mode
1. use: certain factory's diesel-engine body (II level mud core), use this binding agent, its performance indications: dry strength 2.3～2.6MPa, binding agent addition 3～4% changes according to the silica sand situation.180 ℃～200 ℃ of bake out temperatures, temperature retention time is determined on a case-by-case basis.Sand mulling craft: silica sand (GB50/100) 100%+ binding agent (3%～3.5%) is done and is mixed 5min+ water 10% (accounting for the chiltern amount), and wet mixing sand 10 minutes shakes out and makes core.
Certain factory is potassium steel and other wear resistance castings factory, and the trial period is about 1 year, and the foundry goods mud core that all size does not wait is used this binding agent, its raw material with the tapioca starch be main again with corn flour (tapioca starch: corn flour=8:2), sand mulling craft:
Silica sand (GB50/100) 100%+ binding agent (2.5%～4.0%) is done and is mixed 5min+ water 8～9% (accounting for the chiltern amount)+diesel oil 0.3%～0.5% (accounting for the chiltern amount), and mulling 10 minutes is shaked out and made core.Processing performance: dry strength 〉=1.5MPa, 180 ℃～200 ℃ of bake out temperatures, smallclothes need not dried can be from doing.
Starch is as its technology and pattern assembly of binder for casting, and equipment is the same with compound grease sand, makees binding agent if be originally with closing fatty oil.Use starch now instead and make binding agent, all technologies, installing is equipped with all change altogether.
This binding agent is as binder for casting, and it is particularly suitable to replace closing the fatty oil binding agent: 1. roughing sand is not had specific (special) requirements, any thickness sand contains moisture, and containing the mud amount can use.2. technology, tooling device, operating procedure are with to close fatty oil the same.3. this binding agent is that dry powder is packed, convenient transportation.4. cost is low, and price is with to close fatty oil suitable, but addition lacks 1/3 than closing fatty oil.It is low that the bake out temperature ratio closes fatty oil, and it is short that the moisture preserving time ratio closes fatty oil, economizes energy consumption.5. compliance with environmental protection requirements, clean, odorlessness.
Claims (6)
1. method for preparing starch adesive for casting, it is characterized in that: its preparation process is:
1.: bentonite organises
Be under 75 ℃～85 ℃ the condition, organic modifiers to be mixed with 100mmol/100g～110mmol/100g ratio with inorganic bentonite in temperature, the reaction that under stirring condition, organises, behind stirring reaction 1～3h, centrifugal washing;
With the wet organoclay after the washing, progressively adding the intercalator that helps of dissolving in advance while stirring, adding to help intercalator solution and bentonite weight proportion be 0.8: 1.0～1.0: 1.0, stirring keeps, the stirring reaction time is 1～3h, will make the thing stand for standby use;
2.: gelatinized starch organises
Starch is scattered in the cold water, under stirring condition, when progressively being warmed to 75 ℃～85 ℃, starch becomes gelatinized starch mucus: under this temperature, slowly add the intercalator that helps of dissolving in advance, gelatinized starch is 1: 0.7～1: 1 with helping the weight proportion of intercalator solution, and stirring keeps, the stirring reaction time is 1～3h, will make the thing stand for standby use;
3.: make starch adesive
2. 1. step is made thing and step makes thing and left standstill respectively 8～12h hour;
Under the condition of 70 ℃～80 ℃ of temperature, 2. 1. step is made thing and step makes thing and mixes with 1: 9～3: 7 ratios, after stirring 1～3h, pour evaporimeter into, evaporimeter sent in the drier under 40 ℃～50 ℃ the condition of arbitrary vacuum dry, dry back obtains thing and is screened to 100～150 orders in the grinder fragmentation, makes starch adesive for casting.
2. according to the described method for preparing starch adesive for casting of claim 1, it is characterized in that: the described intercalator that helps is a polyvinyl alcohol.
3. according to the described method for preparing starch adesive for casting of claim 2, it is characterized in that: described polyvinyl alcohol concentration is 10%.
4. according to the described method for preparing starch adesive for casting of claim 1, it is characterized in that: described organic modifiers is triethanolamine or Pehanorm salt.
5. according to the described method for preparing starch adesive for casting of claim 1, it is characterized in that: described gelatinized starch is one or more in tapioca, cornstarch and the glutinous rice starch.
6. according to the described method for preparing starch adesive for casting of claim 1, it is characterized in that: described starch adesive for casting adds water, silica sand and other additives in use, promptly gets core sand after the mulling and is used for coremaking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101353311A CN100513006C (en) | 2006-12-15 | 2006-12-15 | Process of preparing starch adesive for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101353311A CN100513006C (en) | 2006-12-15 | 2006-12-15 | Process of preparing starch adesive for casting |
Publications (2)
| Publication Number | Publication Date |
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| CN1974056A CN1974056A (en) | 2007-06-06 |
| CN100513006C true CN100513006C (en) | 2009-07-15 |
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| CNB2006101353311A Expired - Fee Related CN100513006C (en) | 2006-12-15 | 2006-12-15 | Process of preparing starch adesive for casting |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102310157A (en) * | 2011-10-13 | 2012-01-11 | 李华山 | Blending ratio of mud core molding sand |
| CN102581214B (en) * | 2012-03-29 | 2013-12-04 | 福州大学 | Preparation method of modified phenolic resin/kaolin composite binder for casting |
| CN109014020A (en) * | 2018-07-02 | 2018-12-18 | 四川顺宇铸造有限公司 | A kind of casting moulding sand hardening agent and production application process |
| CN111687374A (en) * | 2020-07-07 | 2020-09-22 | 曲阜市铸造材料厂 | Water glass reclaimed sand and preparation method thereof |
| CN113351824B (en) * | 2021-06-09 | 2022-09-23 | 山东交通学院 | Bionic casting binder and preparation method thereof |
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2006
- 2006-12-15 CN CNB2006101353311A patent/CN100513006C/en not_active Expired - Fee Related
Non-Patent Citations (6)
| Title |
|---|
| α淀粉与膨润土在水中的相互作用. 周霞等.铸造，第1997卷第9期. 1997 |
| α淀粉与膨润土在水中的相互作用. 周霞等.铸造，第1997卷第9期. 1997 * |
| 国内外铸造用淀粉粘结剂的研究概况和发展趋势. 周霞等.铸造，第49卷第10期. 2000 |
| 国内外铸造用淀粉粘结剂的研究概况和发展趋势. 周霞等.铸造，第49卷第10期. 2000 * |
| 铸造用改性淀粉粘结剂的研制和应用. 于文斌等.铸造，第55卷第1期. 2000 |
| 铸造用改性淀粉粘结剂的研制和应用. 于文斌等.铸造，第55卷第1期. 2000 * |
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Granted publication date: 20090715 Termination date: 20201215 |