CN105414460A - High-pouring-precision composite modified sodium silicate-bonded sand for pump valve casting and preparation method thereof - Google Patents
High-pouring-precision composite modified sodium silicate-bonded sand for pump valve casting and preparation method thereof Download PDFInfo
- Publication number
- CN105414460A CN105414460A CN201510816164.6A CN201510816164A CN105414460A CN 105414460 A CN105414460 A CN 105414460A CN 201510816164 A CN201510816164 A CN 201510816164A CN 105414460 A CN105414460 A CN 105414460A
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- Prior art keywords
- sand
- sodium silicate
- pump valve
- uniformly mixed
- precision
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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
-
- 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
-
- 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
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
- B22C1/188—Alkali metal silicates
Abstract
The invention discloses high-pouring-precision composite modified sodium silicate-bonded sand for a pump valve casting. Compared with conventional modified sodium silicate binding agents, modified sodium silicate binding agents in the sodium silicate-bonded sand have more excellent normal-temperature wet strength, better thixotropy and rheological property and higher binding speed, and are environmentally friendly, and the use amount of sodium silicate is small. In addition, aluminum titanate added into the sand is low in coefficient of thermal expansion, so that the thermal stability and air permeability of the sand form are improved, and the melt pouring precision is improved; bentonite-loaded nano calcium fluoride is dispersed into the sand to achieve the lubricating and reinforcing effects, a non-stick impermeable layer is formed, and the casting is prevented from carrying and adhering to the sand. The composite modified sodium silicate-bonded sand is excellent in comprehensive performance, compact in structure, rapid in scatter cleaning and high in casting precision and can meet the pouring requirements of the high-precision pump valve casting.
Description
Technical field
The present invention relates to water-glass sand technical field, particularly relate to composite modified water-glass sand of a kind of pump valve foundry goods height cast precision and preparation method thereof.
Background technology
Molding sand is mainly used for the material of moulding in casting according to the class that different ratios is mixed by sand material, bonding agent and adminicle etc., different according to the bonding agent used, clay-bonded sand, water-glass sand, resin sand etc. can be divided into, wherein water-glass sand has that intensity is high, cost is low, technique is simple, pollute the advantages such as little, is widely used.
Pump, valve foundry goods have the features such as wall is thin, complex-shaped, particularly strict to the quality requirement of molding sand in casting process, the quality of molding sand is also the key factor being related to casting quality, although there is significant advantage in sodium silicate sand, also there is a lot of shortcoming simultaneously, obvious defect is mainly manifested in that normal temperature strength is low, collapsibility is poor, regenerating used is difficult, if do not carried out modification to it, is difficult to the quality improving pump valve foundry goods.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, provides composite modified water-glass sand of a kind of pump valve foundry goods height cast precision and preparation method thereof.
The present invention is achieved by the following technical solutions:
A composite modified water-glass sand for pump valve foundry goods height cast precision, this water-glass sand is prepared by the raw material of following weight portion: 50-60 order quartz sand 50-60,80-100 order kaolin 30-40,100-120 order metatitanic acid aluminium powder 10-12, solid content are Ludox 4-5, the sodium pyrophosphate 0.1-0.2 of 30-40%, graphite powder 1-1.5, modified water glass bonding agent 1.5-2, bentonite 2-3, Choline Chloride 0.1-0.2, nano calcium fluoride 0.4-0.5,50% ethanol water 8-10, silane coupler 0.1-0.2.
Described modified water glass bonding agent is made up of the raw material of following weight portion: the waterglass 12-15 of 40-50 Baume degrees, aluminium-magnesium silicate 0.1-0.2, bacteria cellulose 2-3, quaternary ammonium salt ionic liquid 6-8; Its modification method for preparing is: first drop in quaternary ammonium salt ionic liquid by bacteria cellulose, be heated to 40-50 DEG C, be uniformly mixed 2-3h, adds other leftover materials subsequently, continues to be uniformly mixed 40-50min, to obtain final product.
The preparation method of the composite modified water-glass sand of described a kind of pump valve foundry goods height cast precision is:
(1) first nano calcium fluoride, silane coupler are added in ethanol water, ultrasonic agitation dispersion 40-50min, obtain nano calcium fluoride dispersion liquid for subsequent use, add bentonite subsequently, be uniformly mixed 2-3h, stir and after terminating, mixed material is poured in evaporimeter, dry process in 70-80 DEG C of environment, completely except desolventizing, subsequently that gains abrasive lapping is broken, obtain 100-200 order powder for subsequent use;
(2) batch mixing is carried out according to the material taking sequence of quartz sand, kaolin, metatitanic acid aluminium powder, graphite powder, after being uniformly mixed 40-50min, add step (1) gained material, continue to be uniformly mixed 30-40min, finally add modified water glass bonding agent and other leftover materials again, shake out after being blown into carbon dioxide solidification after being uniformly mixed and get final product.
Modified water glass bonding agent prepared by the present invention has more excellent normal temperature wet strength than the modified water glass bonding agent of routine, and better, adhering speed is fast for thixotropy and rheological characteristic, and environmental protection, waterglass consumption is few; In addition the metatitanic acid aluminium powder thermal coefficient of expansion added in sand material is low, heat endurance and the gas permeability of sand mold can be improved, improve liquation cast precision, and be scattered in through the nano calcium fluoride of alta-mud load the effect having lubrication, enhancing in sand material, and can be formed and be not stained with impervious barrier, prevent foundry goods burning into sand, scab; This composite modified water-glass sand high comprehensive performance, compact conformation, defeated and dispersed cleaning is fast, and casting accuracy is high, can meet the cast requirement of high accuracy pump valve foundry goods.
Detailed description of the invention
The water-glass sand of this embodiment is prepared by the raw material of following weight portion: 50 order quartz sand 50,80 order kaolin 30,100 order metatitanic acid aluminium powders 10, solid content are Ludox 4, sodium pyrophosphate 0.1, graphite powder 1, modified water glass bonding agent 1.5, bentonite 2, Choline Chloride 0.1, nano calcium fluoride 0.4,50% ethanol water 8, the silane coupler 0.1 of 30%.
Wherein modified water glass bonding agent is made up of the raw material of following weight portion: the waterglass 12 of 40 Baume degrees, aluminium-magnesium silicate 0.1, bacteria cellulose 2, quaternary ammonium salt ionic liquid 6; Its modification method for preparing is: first drop in quaternary ammonium salt ionic liquid by bacteria cellulose, is heated to 40 DEG C, is uniformly mixed 2h, adds other leftover materials subsequently, continues to be uniformly mixed 40min, to obtain final product.
The preparation method of this embodiment water-glass sand is:
(1) first nano calcium fluoride, silane coupler are added in ethanol water, ultrasonic agitation dispersion 40min, obtain nano calcium fluoride dispersion liquid for subsequent use, add bentonite subsequently, be uniformly mixed 2h, stir and after terminating, mixed material is poured in evaporimeter, dry process in 70 DEG C of environment, completely except desolventizing, subsequently that gains abrasive lapping is broken, obtain 100 order powders for subsequent use;
(2) batch mixing is carried out according to the material taking sequence of quartz sand, kaolin, metatitanic acid aluminium powder, graphite powder, after being uniformly mixed 40min, add step (1) gained material, continue to be uniformly mixed 30min, finally add modified water glass bonding agent and other leftover materials again, shake out after being blown into carbon dioxide solidification after being uniformly mixed and get final product.
The present embodiment sand conditioning become the cylindrical sample of φ 50 × 50mm to carry out the performance test results to be:
Tensile strength: 2.34MPa; Compression strength: 4.45MPa; Gas permeability: 60; Hygroscopicity≤1.5%; Retained strength (800 DEG C) 0.30MPa: reclamation rate >=90%.The cast(ing) surface precision obtained is high, and good stability of the dimension, yield rate reaches more than 95%.
Claims (3)
1. the composite modified water-glass sand of a pump valve foundry goods height cast precision, it is characterized in that, this water-glass sand is prepared by the raw material of following weight portion: 50-60 order quartz sand 50-60,80-100 order kaolin 30-40,100-120 order metatitanic acid aluminium powder 10-12, solid content are Ludox 4-5, the sodium pyrophosphate 0.1-0.2 of 30-40%, graphite powder 1-1.5, modified water glass bonding agent 1.5-2, bentonite 2-3, Choline Chloride 0.1-0.2, nano calcium fluoride 0.4-0.5,50% ethanol water 8-10, silane coupler 0.1-0.2.
2. the composite modified water-glass sand of a kind of pump valve foundry goods height cast precision as claimed in claim 1, it is characterized in that, described modified water glass bonding agent is made up of the raw material of following weight portion: the waterglass 12-15 of 40-50 Baume degrees, aluminium-magnesium silicate 0.1-0.2, bacteria cellulose 2-3, quaternary ammonium salt ionic liquid 6-8; Its modification method for preparing is: first drop in quaternary ammonium salt ionic liquid by bacteria cellulose, be heated to 40-50 DEG C, be uniformly mixed 2-3h, adds other leftover materials subsequently, continues to be uniformly mixed 40-50min, to obtain final product.
3. the preparation method of the composite modified water-glass sand of a kind of pump valve foundry goods height cast precision as claimed in claim 1, it is characterized in that, described preparation method is:
(1) first nano calcium fluoride, silane coupler are added in ethanol water, ultrasonic agitation dispersion 40-50min, obtain nano calcium fluoride dispersion liquid for subsequent use, add bentonite subsequently, be uniformly mixed 2-3h, stir and after terminating, mixed material is poured in evaporimeter, dry process in 70-80 DEG C of environment, completely except desolventizing, subsequently that gains abrasive lapping is broken, obtain 100-200 order powder for subsequent use;
(2) batch mixing is carried out according to the material taking sequence of quartz sand, kaolin, metatitanic acid aluminium powder, graphite powder, after being uniformly mixed 40-50min, add step (1) gained material, continue to be uniformly mixed 30-40min, finally add modified water glass bonding agent and other leftover materials again, shake out after being blown into carbon dioxide solidification after being uniformly mixed and get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510816164.6A CN105414460A (en) | 2015-11-23 | 2015-11-23 | High-pouring-precision composite modified sodium silicate-bonded sand for pump valve casting and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510816164.6A CN105414460A (en) | 2015-11-23 | 2015-11-23 | High-pouring-precision composite modified sodium silicate-bonded sand for pump valve casting and preparation method thereof |
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| CN105414460A true CN105414460A (en) | 2016-03-23 |
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| CN201510816164.6A Pending CN105414460A (en) | 2015-11-23 | 2015-11-23 | High-pouring-precision composite modified sodium silicate-bonded sand for pump valve casting and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112341209A (en) * | 2020-11-07 | 2021-02-09 | 郑州远东耐火材料有限公司 | Modified water glass adhesive for sand mold of zirconia-corundum fused brick and sand mold thereof |
| CN114535500A (en) * | 2021-12-31 | 2022-05-27 | 北京航空航天大学宁波创新研究院 | Modified silica fume suspension for casting, modified water glass and using method |
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| CN101885035A (en) * | 2010-06-23 | 2010-11-17 | 深圳市景鼎现代科技有限公司 | Formula of water glass modifying additive and production process and using method thereof |
| CN103231008A (en) * | 2013-04-16 | 2013-08-07 | 繁昌县恒鑫汽车零部件有限公司 | High temperature resistance precoated sand |
| CN103567356A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Sodium silicate sand with high wet-compressive strength and preparation method thereof |
| CN103570367A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | High fire-resistant molding sand for casting and preparation method thereof |
| CN104259380A (en) * | 2014-10-25 | 2015-01-07 | 哈尔滨理工大学 | Composite modified water glass sand with high collapsibility and preparation method thereof |
| CN104668440A (en) * | 2015-02-04 | 2015-06-03 | 繁昌县金科机电科技有限公司 | Environment-friendly casting coated sand and method for preparing the coated sand |
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2015
- 2015-11-23 CN CN201510816164.6A patent/CN105414460A/en active Pending
Patent Citations (9)
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| CN87101502A (en) * | 1987-02-26 | 1987-11-04 | 大连起重机器厂 | Producing modified organic water-glass bonder |
| CN1054245A (en) * | 1991-04-12 | 1991-09-04 | 冶金工业部洛阳耐火材料研究院 | Continuous casting tundish insulating board and preparation method thereof |
| CN1238249A (en) * | 1999-05-26 | 1999-12-15 | 沈阳市铸造材料研究所 | Modified water glass for casting and its preparing process |
| CN101885035A (en) * | 2010-06-23 | 2010-11-17 | 深圳市景鼎现代科技有限公司 | Formula of water glass modifying additive and production process and using method thereof |
| CN103231008A (en) * | 2013-04-16 | 2013-08-07 | 繁昌县恒鑫汽车零部件有限公司 | High temperature resistance precoated sand |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112341209A (en) * | 2020-11-07 | 2021-02-09 | 郑州远东耐火材料有限公司 | Modified water glass adhesive for sand mold of zirconia-corundum fused brick and sand mold thereof |
| CN114535500A (en) * | 2021-12-31 | 2022-05-27 | 北京航空航天大学宁波创新研究院 | Modified silica fume suspension for casting, modified water glass and using method |
| CN114535500B (en) * | 2021-12-31 | 2023-11-14 | 北京航空航天大学宁波创新研究院 | Modified silica fume suspension for casting, modified water glass and use method |
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Application publication date: 20160323 |
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