CN110000329B - Formwork hardener for investment casting - Google Patents
Formwork hardener for investment casting Download PDFInfo
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- CN110000329B CN110000329B CN201910402016.8A CN201910402016A CN110000329B CN 110000329 B CN110000329 B CN 110000329B CN 201910402016 A CN201910402016 A CN 201910402016A CN 110000329 B CN110000329 B CN 110000329B
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- sodium fluosilicate
- isopropanol
- dihydrate
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
- B22C1/10—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for influencing the hardening tendency of the mould material
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention relates to a formwork hardening agent for investment casting, which consists of the following raw materials in parts by weight: 10-15 parts of crystalline aluminum chloride hexahydrate; 10-15 parts of sodium fluosilicate; 15-20 parts of dihydrate flaky calcium chloride; 0.1-1.5 parts of isopropanol; anhydrous boric acid 1.2-1.8; 55-75 parts of clear water. Sodium fluosilicate water glassThe glass has obvious hardening acceleration effect, and especially has more obvious effect when being matched with the penetrant isopropanol. The use of sodium fluosilicate can reduce the dosage of dihydrate flaky calcium chloride, so that Na in the hardening process of the shell2The O residue is obviously reduced, so the high-temperature strength and the wet strength of the shell are obviously enhanced, and the dimensional precision of the casting can be ensured.
Description
Technical Field
The invention relates to a formwork hardener for investment casting.
Background
The investment precision casting industry mostly adopts water glass as a binder, and a common shuttering hardener is prepared by hexahydrate crystalline aluminum chloride, dihydrate flaky calcium chloride, anhydrous boric acid, a penetrant and clear water according to a proportion, wherein the penetrant is JFC or X405 or wins-8010, and the shuttering hardener also contains a wetting agent S1003 or SR-2.
The hardening agent takes hexahydrate crystal aluminum chloride and dihydrate flaky calcium chloride as main materials, although the defect that the application of ammonium chloride seriously worsens the labor condition is overcome, a larger amount of Na exists in the dihydrate flaky calcium chloride in the hardening process of the formwork2And O remains, which reduces the high-temperature strength and the wet strength of the mold shell, thereby reducing the size precision of the casting.
Disclosure of Invention
The invention aims to solve the technical problems of the hardening agent which takes the crystal aluminum chloride hexahydrate and the calcium chloride dihydrate flakes as main materials and discloses a formwork hardening agent for investment casting.
The formwork hardening agent comprises the following raw materials in parts by weight: 10-15 parts of crystalline aluminum chloride hexahydrate; 10-15 parts of sodium fluosilicate; 15-20 parts of dihydrate flaky calcium chloride; 0.1-1.5 parts of isopropanol; anhydrous boric acid 1.2-1.8; 55-75 parts of clear water.
The invention relates to a hardening agent used in the solidification process of quartz sand and water glass formworks, wherein, the crystal aluminum chloride hexahydrate is used for enhancing the strength of the formworks, because the reaction speed of the crystal aluminum chloride hexahydrate is slower, the formworks and water glass are mutually neutralized in the solidification process to promote hydrolysis, the pH value of the water glass is gradually reduced to separate out silica gel, meanwhile, the pH value of the crystal aluminum chloride hexahydrate is gradually increased to separate out AL (OH) through hydrolytic polymerization reaction3The aluminum gel forms silica gel and the aluminum gel to be coagulated together, so the strength of the formwork is high.
The cold water solution of sodium fluosilicate is neutral, the hot water solution is alkaline, and the sodium fluosilicate has obvious hardening acceleration effect on water glass, and particularly has more obvious effect when being matched with penetrant isopropanol.
The use of sodium fluosilicate can reduce the dosage of dihydrate flaky calcium chloride, so that Na in the hardening process of the mold shell2The O residue is obviously reduced, so the high-temperature strength and the wet strength of the formwork are obviously enhanced, and the size precision of the casting can be ensured.
Compared with the hardening agent which takes the hexahydrate crystal aluminum chloride and the dihydrate flaky calcium chloride as main materials, the invention not only obviously improves the labor condition and the like, but also has the following characteristics: the hardening agent can obviously improve the strength of the shuttering when hardened for 5 minutes, and can achieve the hardening effect of the hardening agent for 15 minutes when hardened for 10 minutes, thereby not only shortening the production period of the shuttering, but also obviously improving the size precision of the shuttering after dewaxing and roasting, further improving the qualification rate of castings from 89-92 percent to 94-96 percent, and increasing the economic benefit.
Detailed Description
The present invention is further illustrated by the following examples.
The quality requirements of the raw materials are as follows: crystalline aluminum chloride hexahydrate, the content is more than 90 percent; sodium fluosilicate, the content is more than 97%; dihydrate flaky calcium chloride, the content of which is more than 72 percent; isopropanol, concentration 99%; anhydrous boric acid with content more than 98%; and (4) clear water.
Example 1
The raw materials comprise the following components in parts by weight: taking 15 parts by weight of hexahydrate crystal aluminum chloride, 10 parts by weight of sodium fluosilicate, 20 parts by weight of dihydrate flaky calcium chloride, 0.1 part by weight of isopropanol and 1.8 parts by weight of anhydrous boric acid.
And (3) injecting 75 parts by weight of clear water (normal temperature) into a stirring tank, sequentially adding the raw materials while stirring, continuously stirring for 30 minutes, stopping the machine, pouring the mixture into a large tank through an anticorrosive pump, performing melting reaction for 2 hours, and using the mixture, wherein the pH value of the hardening agent is 7-7.3.
Example 2
The raw materials comprise the following components in parts by weight: taking 12 parts by weight of hexahydrate crystal aluminum chloride, 13 parts by weight of sodium fluosilicate, 17 parts by weight of dihydrate flaky calcium chloride, 1 part by weight of isopropanol and 1.5 parts by weight of anhydrous boric acid.
Injecting 65 parts by weight of clear water (normal temperature) into a stirring tank, sequentially adding the raw materials while stirring, continuously stirring for 30 minutes, stopping the machine, pouring the mixture into a large tank through an antiseptic pump, performing melting reaction for 2 hours, and then using the mixture, wherein the pH value of a hardening agent is 7.1-7.4.
Example 3
The raw materials comprise the following components in parts by weight: 10 parts by weight of crystalline aluminum chloride hexahydrate, 15 parts by weight of sodium fluosilicate, 15 parts by weight of dihydrate flaky calcium chloride, 1.5 parts by weight of isopropanol and 1.2 parts by weight of anhydrous boric acid are taken.
55 parts by weight of clear water (normal temperature) is injected into a stirring tank, the raw materials are sequentially added under stirring, the stirring is continued for 30 minutes, then the machine is stopped, the mixture is poured into a large tank through an antiseptic pump, the mixture is used after being melted and reacted for 2 hours, and the pH value of the hardening agent is 7.3-7.4.
Claims (1)
1. The formwork hardening agent for investment casting is characterized by comprising the following raw materials in parts by weight: crystalline aluminum chloride hexahydrate 15; 10 parts of sodium fluosilicate; dihydrate platy calcium chloride 20; 0.1 parts of isopropanol; anhydrous boric acid 1.8; clear water 75; wherein the content of the sodium fluosilicate is more than 97 percent, and the concentration of the isopropanol is 99 percent; the formwork hardening agent is prepared by the following method:
and (3) injecting 75 parts by weight of normal-temperature clear water into a stirring tank, sequentially adding the raw materials while stirring, continuously stirring for 30 minutes, stopping the machine, pouring the mixture into a large tank through an anticorrosive pump, and carrying out melting reaction for 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910402016.8A CN110000329B (en) | 2019-05-15 | 2019-05-15 | Formwork hardener for investment casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910402016.8A CN110000329B (en) | 2019-05-15 | 2019-05-15 | Formwork hardener for investment casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110000329A CN110000329A (en) | 2019-07-12 |
| CN110000329B true CN110000329B (en) | 2021-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910402016.8A Active CN110000329B (en) | 2019-05-15 | 2019-05-15 | Formwork hardener for investment casting |
Country Status (1)
| Country | Link |
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| CN (1) | CN110000329B (en) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101362190B (en) * | 2008-09-28 | 2010-06-23 | 上海应用技术学院 | Composite curing method of sodium silicate binder |
| CN102133614A (en) * | 2010-01-25 | 2011-07-27 | 襄樊市科民化工科技有限公司 | Formwork curing agent and production method thereof |
| CN103102119B (en) * | 2011-11-10 | 2015-08-26 | 比亚迪股份有限公司 | A kind of stiffening agent and preparation method thereof |
| CN103212666B (en) * | 2013-04-03 | 2015-01-14 | 沈阳汇亚通铸造材料有限责任公司 | Slurry-shaped inorganic enhancing agent for casting sodium silicate self-hardening sand and preparation method thereof |
| CN103658522B (en) * | 2013-12-24 | 2015-08-12 | 江苏丰泽生物工程设备制造有限公司 | Small-sized fermentation tank precision casting technology |
| CN104226890B (en) * | 2014-09-30 | 2016-06-22 | 济南圣泉集团股份有限公司 | The waterglass reinforcing agent of casting and preparation method |
| CN104525847A (en) * | 2014-12-22 | 2015-04-22 | 南京优耐特精密机械制造有限公司 | Shell hardening agent |
| CN105312486A (en) * | 2015-10-20 | 2016-02-10 | 天津荣亨集团股份有限公司 | Shuttering hardening agents |
| CN105347727A (en) * | 2015-11-26 | 2016-02-24 | 自贡格灵新材料科技有限公司 | High-permeability liquid hardening agent |
| CN108145091A (en) * | 2017-12-18 | 2018-06-12 | 定远县宝隆机械制造有限公司 | A kind of case hardening agent prescription of model casting |
| CN107931515A (en) * | 2017-12-18 | 2018-04-20 | 定远县宝隆机械制造有限公司 | A kind of investment casting formwork composite hardening agent prescription |
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2019
- 2019-05-15 CN CN201910402016.8A patent/CN110000329B/en active Active
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| CN110000329A (en) | 2019-07-12 |
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