CN102179471A - Inorganic casting bonding agent based on phosphate - Google Patents
Inorganic casting bonding agent based on phosphate Download PDFInfo
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- CN102179471A CN102179471A CN 201110129197 CN201110129197A CN102179471A CN 102179471 A CN102179471 A CN 102179471A CN 201110129197 CN201110129197 CN 201110129197 CN 201110129197 A CN201110129197 A CN 201110129197A CN 102179471 A CN102179471 A CN 102179471A
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Abstract
The invention relates to an inorganic bonding agent for casting, which is an inorganic casting bonding agent based on phosphate applied to hot core technology. The phosphate casting inorganic bonding agent consists of phosphate solution, polyvinyl alcohol [CH2CH(OH)]n solution and a metal oxide curing agent; when being applied to preparing sand type or sand core, by taking the new sand according to parts by weight as reference, the phosphate casting inorganic bonding agent comprises the following components: 100 parts of new sand, 0.1-1 part of metal oxide curing agent, 0.5-2 parts of polyvinyl alcohol solution, and 3-5 parts of phosphate solution. In the invention, based on the phosphate casting inorganic bonding agent, hydrophobic nodes are added in condensed phosphate space lattices so that the rate of contacting with water is reduced and the wet resistance is obviously improved; for the sand type or sand core prepared by taking phosphate as the main body of the casting bonding agent, no harmful product can be produced during the process of casting production compared with organic resign bonding agent; the added polyvinyl alcohol for improving the wet resistance does not like benzene-containing organic resin to cause the production of harmful gas because of incomplete combustion.
Description
Technical field
The present invention relates to a kind of casting inorganic binder, promptly be applied to a kind of of hot core technology based on phosphatic inorganic casting binder.
Background technology
As manufacturing basis, foundary industry has entered a unprecedented fast-developing period along with the rapid growth of made in China, especially automobile industry.
At present, need to use large batch of resinoid bond in the production process of high-grade foundry goods, can produce a large amount of free formaldehyde and free-phenol in the precoated sand production process that hot method is solidified; The effect that the cold-box rule needs the triethylamine gas catalysis of poison realizes the methylol (CH in the phenolic resins
2OH) (N=C=O) generate the reaction of solid urethanes phenolic aldehyde between the group and in the PIC; No matter be hot method, or cold process, behind casting pouring resin fully or imperfect combustion all can produce a large amount of harmful exhausts; Going from bad to worse of environment, the enhancing of environmental consciousness forces people constantly to seek novel lowly to get angry, the pollution-free green casting binder.
Adopt CO
2Nontoxic, tasteless, the casting process non-exhaust emission of waterglass series inorganic binder that solidifies, but defectives such as retained strength is too high, difficult regeneration cause it to produce to be polluted, thereby the phosphate base inorganic binder with good collapsibility becomes the preferred material of green casting binder.
Though as far back as 1978, U.S. Pat 4127157 just proposed based on phosphatic casting binder; But the disadvantage of phosphate binders promptly has significantly easily hygroscopicity, and sucting wet problem causes the phosphate space lattice node disconnection that solidify to form on the one hand and loses intensity, can't guarantee the profile of sand mold or core, but influence the resting period of core; Aqueous vapor in the core is vaporized in casting process and is caused the bleb defective on the other hand, brings harm to casting quality.In order to solve the hygroscopicity problem, the Zhang Youshou of lake Beijing Polytechnical University etc. adopt the method for adding various oxides, strengthen phosphatic bond strength and improve moisture-proof, but effect is unsatisfactory, bring difficulty for especially the regeneration of old sand; Its patent CN10941045A has proposed the curing agent preparation method of phosphate binders, has reduced the powdery curing agent and has produced the possibility of dust, contains the benzene organic resin but but added.German patent DE 10226817C1 is at the core bending strength deficiency of phosphate binders preparation, add the organic matter that contains polyamines (Polyamine), also still there is significantly easily hygroscopicity in European products based on this patent, sand test specimen after the curing under relative humidity 85 ± 5% conditions, but the resting period be no more than two hours.
Summary of the invention
Hygroscopicity problem at above-mentioned phosphate binders, but guarantee to use the sand mold of phosphate binders or core to have the longer resting period, reduce the probability that bleb is scrapped, the present invention is on phosphate casting inorganic binder basis, thereby increase the probability that the hydrophobic node reduces contact wetting by phosphate space lattice, significantly improve its moisture-proof in polycondensation; With phosphate is sand mold or the core that the casting binder main body prepares, and than the organic resin binding agent, can not produce any harmful product in foundry production; Can be for improving the polyvinyl alcohol that moisture-proof adds as the organic resin that contains benzene, because of imperfect combustion produces harmful gas.
The present invention is with reference to the structure of common phospholipid molecule in the biology, promptly has the double grading of the vinyl group of the phosphate radical of water-wet behavior and hydrophobic character, satisfies complicated hydrophilic and hydrophobic requirement.
Described phosphate casting inorganic binder is by phosphate solution, polyvinyl alcohol [CH
2CH (OH)]
nSolution and metal oxide curing agent are formed; Be reference with the fresh sand parts by weight when being used to prepare sand mold or core, promptly fresh sand is 100 parts, 3 ~ 5 parts of 0.1 ~ 1 part of metal oxide curing agent, 0.5 ~ 2 part of poly-vinyl alcohol solution and phosphate solutions.
Phosphate solution calculates by weight: 80 ~ 150 parts in 00 part of phosphatase 11,10 ~ 40 parts in aluminium hydroxide, 1 ~ 6 part of barium hydroxide and water mix said components and to make phosphate solution at 80 ~ 150 degree; Wherein the product aluminum phosphate of phosphoric acid and aluminium hydroxide reaction is the key component of binding agent, and barium hydroxide is as the stabilizing agent of avoiding aluminum phosphate polycondensation precipitation.
Poly-vinyl alcohol solution calculates by weight: 650 parts～2000 parts in 100 parts of polyvinyl alcohol, 5 ~ 20 parts of citric acids and water mix said components and to make at 70 ~ 120 degree; Wherein the hydroxyl in the polyvinyl alcohol participates in phosphatic dehydration polycondensation reaction, and vinyl group forms the hydrophobic node of phosphate network.
Described metal oxide curing agent is a pure zirconia magnesium powder.
The method that above-mentioned phosphate casting inorganic binder is prepared sand mold or core is: the fresh sand quality is with 100 listed as parts by weight, successively add 3 ~ 5 parts of metal oxide curing agent 0.1 ~ 1 weight portion, poly-vinyl alcohol solution 0.5 ~ 2 weight portion and phosphate solutions, and evenly mix; The molding sand of mixing or core sand add core box and consolidation with manual or mechanical mode, are heated to 80 ~ 150 ℃ of thermal currents that solidify or adopt uniform temp and solidify core or sand mold that the formation casting is required.
Curing process makes and phosphate generation polycondensation reaction forms the surface that space lattice is coated on casting model powder, and these casting model powders is closely linked formation casting sand core or the required intensity of sand mold; Because the vinyl group that has hydrophobic character on the space lattice part of nodes significantly reduces the suction probability, makes casting sand core or sand mold have good moisture-proof; The combustion process of vinyl group behind casting and pouring can not produce any poisonous gas discharging because of the imperfect combustion of similar phenyl ring, thereby is a kind of casting binder of environmental protection.
The specific embodiment
In order to estimate the hygroscopicity of casting binder, normally the sand test specimen after solidifying is positioned under specified moisture (as relative humidity 85 ± 5%) condition, measure sample tensile strength or compression strength attenuation relation in time, easily the binding agent sample of moisture absorption may lose intensity and defeated and dispersed in one hour or a few hours, but has a strong impact on the resting period of casting sand type or core.
Further specify actual using method of the present invention below in conjunction with example, it is an explanation of the invention and be not limited to following example.
Example 1
Phosphate solution is according to calculating by weight: mass percentage concentration is 100 parts in 85% 2 a parts+water of 25 parts+barium hydroxide of 100 parts+aluminium hydroxide of industrial phosphoric acid, said components is mixed at 90 degree make phosphate solution;
Poly-vinyl alcohol solution is according to calculating by weight: 900 parts in the 7 parts+water of 100 parts+citric acid of polyvinyl alcohol of the degree of polymerization 1750 ± 50 mixes said components and to make poly-vinyl alcohol solution at 80 degree;
The molding sand preparation is calculated according to mass fraction: with 0.8 part of 3 parts+poly-vinyl alcohol solution of 0.6 part+phosphate solution of 100 mass parts roughing sand+magnesia powders, mixed in 10 minutes; The molding sand of mixing is put into " ∞ " sample mould and consolidation with manual mode, is heated to 120 ℃, solidifies in 5 minutes, forms the required sand mold of casting, takes out sample and tests its tensile strength, real-time intensity 0.23MPa; Under 85 ± 5% damp conditions, the intensity 0.21Mpa after 24 hours, but this intensity means at least 24 hours resting periods of sand test specimen.
Example 2
Phosphate solution is according to calculating by weight: mass percentage concentration is 2.5 parts of 85% 25 parts+barium hydroxides of 100 parts+aluminium hydroxide of industrial phosphoric acid, mixes and adds thermal agitation and prepare aluminum phosphate solution;
Poly-vinyl alcohol solution is according to calculating by weight: 900 parts in the 7 parts+water of 100 parts+citric acid of polyvinyl alcohol of the degree of polymerization 1750 ± 50 mixes said components and to make poly-vinyl alcohol solution at 120 degree;
The molding sand preparation is calculated according to mass fraction: with 1.8 parts of 4.8 parts+poly-vinyl alcohol solutions of 0.85 part+phosphate solution of 100 mass parts roughing sand+magnesia powders, mixed in 15 minutes; The molding sand of mixing is put into " ∞ " sample mould and consolidation, adopts 150 ℃ thermal current to solidify 5 minutes, forms the required sand mold of casting, takes out sample and tests its tensile strength;
Real-time intensity 0.28MPa; Under 85 ± 5% damp conditions, the intensity 0.24Mpa after 24 hours, but this intensity means at least 24 hours resting periods of sand test specimen.
Claims (5)
1. one kind based on phosphatic inorganic casting binder, and it is characterized in that: described inorganic casting binder is by phosphate solution, polyvinyl alcohol [CH
2CH (OH)]
nSolution and metal oxide curing agent are formed; Be reference with the fresh sand parts by weight when being used to prepare sand mold or core, promptly fresh sand is 100 parts, 3 ~ 5 parts of 0.1 ~ 1 part of metal oxide curing agent, 0.5 ~ 2 part of poly-vinyl alcohol solution and phosphate solutions.
2. as claimed in claim 1 a kind of based on phosphatic inorganic casting binder, it is characterized in that: described phosphate solution calculates by weight: 80 ~ 150 parts in 00 part of phosphatase 11,10 ~ 40 parts in aluminium hydroxide, 1 ~ 6 part of barium hydroxide and water mix said components and to make phosphate solution at 80 ~ 150 degree.
3. as claimed in claim 1 a kind of based on phosphatic inorganic casting binder, it is characterized in that: described poly-vinyl alcohol solution calculates by weight: 650 parts～2000 parts in 100 parts of polyvinyl alcohol, 5 ~ 20 parts of citric acids and water mix said components and to make at 70 ~ 120 degree.
4. as claimed in claim 1 a kind of based on phosphatic inorganic casting binder, it is characterized in that: described metal oxide curing agent is a pure zirconia magnesium powder.
5. with the described a kind of method that is used to prepare sand mold or core based on phosphatic inorganic casting binder of claim 1 be: the fresh sand quality is with 100 listed as parts by weight, successively add 3 ~ 5 parts of metal oxide curing agent 0.1 ~ 1 weight portion, poly-vinyl alcohol solution 0.5 ~ 2 weight portion and phosphate solutions, and evenly mix; The molding sand of mixing or core sand add core box and consolidation with manual or mechanical mode, are heated to 80 ~ 150 ℃ of thermal currents that solidify or adopt uniform temp and solidify core or sand mold that the formation casting is required.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110129197 CN102179471B (en) | 2011-05-18 | 2011-05-18 | Inorganic casting bonding agent based on phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110129197 CN102179471B (en) | 2011-05-18 | 2011-05-18 | Inorganic casting bonding agent based on phosphate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102179471A true CN102179471A (en) | 2011-09-14 |
| CN102179471B CN102179471B (en) | 2013-04-17 |
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| CN 201110129197 Expired - Fee Related CN102179471B (en) | 2011-05-18 | 2011-05-18 | Inorganic casting bonding agent based on phosphate |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302232A (en) * | 2013-05-07 | 2013-09-18 | 湖北工业大学 | Modified phosphate casting binder and preparation method and application thereof |
| CN104289661A (en) * | 2014-09-10 | 2015-01-21 | 湖北工业大学 | Preparation of coated sand by use of phosphate inorganic binder and molding method thereof |
| CN105964891A (en) * | 2016-05-20 | 2016-09-28 | 重庆长江造型材料（集团）股份有限公司 | High-fluidity phosphate inorganic binder sand and preparation method thereof |
| CN106311960A (en) * | 2015-06-23 | 2017-01-11 | 姚伟 | Bonding agent and preparing method thereof |
| CN106424535A (en) * | 2016-11-24 | 2017-02-22 | 合肥仁创铸造材料有限公司 | Inorganic precoated sand and preparation method thereof |
| CN106734861A (en) * | 2016-12-15 | 2017-05-31 | 龚禧 | Based on lactic acid and polylactic acid modified phosphate inorganic adhesive and preparation method thereof |
| CN106734860A (en) * | 2016-12-02 | 2017-05-31 | 陈佩珊 | One kind is based on phosphatic organic casting binder |
| CN107584069A (en) * | 2017-10-31 | 2018-01-16 | 湖北工业大学 | A kind of heat cure phosphate casting binder and preparation method thereof and application method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5910442A (en) * | 1982-07-12 | 1984-01-19 | Tokuyama Soda Co Ltd | Material of casting mold |
| CN85103047A (en) * | 1985-03-12 | 1986-09-10 | 秩父水泥株式会社 | The stiffening agent that water glass is used |
| CN101417315A (en) * | 2007-10-24 | 2009-04-29 | 大连核心铸造技术工程研究所 | Phosphate binder for casting |
| CN101590517A (en) * | 2009-06-23 | 2009-12-02 | 华中科技大学 | Be used for composite modified material of lost foam casting Mg alloy surface and preparation method thereof |
| CN101941045A (en) * | 2009-07-10 | 2011-01-12 | 湖北工业大学 | Preparation method and application of phosphate inorganic casting binder suspension curing agent |
-
2011
- 2011-05-18 CN CN 201110129197 patent/CN102179471B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5910442A (en) * | 1982-07-12 | 1984-01-19 | Tokuyama Soda Co Ltd | Material of casting mold |
| CN85103047A (en) * | 1985-03-12 | 1986-09-10 | 秩父水泥株式会社 | The stiffening agent that water glass is used |
| CN101417315A (en) * | 2007-10-24 | 2009-04-29 | 大连核心铸造技术工程研究所 | Phosphate binder for casting |
| CN101590517A (en) * | 2009-06-23 | 2009-12-02 | 华中科技大学 | Be used for composite modified material of lost foam casting Mg alloy surface and preparation method thereof |
| CN101941045A (en) * | 2009-07-10 | 2011-01-12 | 湖北工业大学 | Preparation method and application of phosphate inorganic casting binder suspension curing agent |
Non-Patent Citations (1)
| Title |
|---|
| 《金属工艺学》 20080630 张瑞平 "金属工艺学" 冶金工业出版社 第134和136页 5 , * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302232A (en) * | 2013-05-07 | 2013-09-18 | 湖北工业大学 | Modified phosphate casting binder and preparation method and application thereof |
| CN104289661A (en) * | 2014-09-10 | 2015-01-21 | 湖北工业大学 | Preparation of coated sand by use of phosphate inorganic binder and molding method thereof |
| CN106311960A (en) * | 2015-06-23 | 2017-01-11 | 姚伟 | Bonding agent and preparing method thereof |
| CN105964891A (en) * | 2016-05-20 | 2016-09-28 | 重庆长江造型材料（集团）股份有限公司 | High-fluidity phosphate inorganic binder sand and preparation method thereof |
| CN105964891B (en) * | 2016-05-20 | 2017-11-14 | 重庆长江造型材料（集团）股份有限公司 | A kind of phosphate inorganic adhesive sand with high fluidity and preparation method thereof |
| CN106424535A (en) * | 2016-11-24 | 2017-02-22 | 合肥仁创铸造材料有限公司 | Inorganic precoated sand and preparation method thereof |
| CN106734860A (en) * | 2016-12-02 | 2017-05-31 | 陈佩珊 | One kind is based on phosphatic organic casting binder |
| CN106734861A (en) * | 2016-12-15 | 2017-05-31 | 龚禧 | Based on lactic acid and polylactic acid modified phosphate inorganic adhesive and preparation method thereof |
| CN107584069A (en) * | 2017-10-31 | 2018-01-16 | 湖北工业大学 | A kind of heat cure phosphate casting binder and preparation method thereof and application method |
| CN107584069B (en) * | 2017-10-31 | 2020-03-10 | 湖北工业大学 | Thermosetting phosphate casting binder and preparation method and use method thereof |
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| Publication number | Publication date |
|---|---|
| CN102179471B (en) | 2013-04-17 |
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Granted publication date: 20130417 Termination date: 20200518 |