CN105414463A - Heat-shock resistant efficient composite modified sodium silicate sand for pump valve casting and preparation method thereof - Google Patents

Heat-shock resistant efficient composite modified sodium silicate sand for pump valve casting and preparation method thereof Download PDF

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Publication number
CN105414463A
CN105414463A CN201510833980.8A CN201510833980A CN105414463A CN 105414463 A CN105414463 A CN 105414463A CN 201510833980 A CN201510833980 A CN 201510833980A CN 105414463 A CN105414463 A CN 105414463A
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China
Prior art keywords
sand
sodium silicate
casting
modified sodium
pump valve
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CN201510833980.8A
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Chinese (zh)
Inventor
吴寿涛
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TONGLING JINGWEI FLUID TECHNOLOGY Co Ltd
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TONGLING JINGWEI FLUID TECHNOLOGY Co Ltd
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Priority to CN201510833980.8A priority Critical patent/CN105414463A/en
Publication of CN105414463A publication Critical patent/CN105414463A/en
Pending legal-status Critical Current

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Abstract

The invention discloses heat-shock resistant efficient composite modified sodium silicate sand for a pump valve casting. Compared with a common modified sodium silicate adhesive, a modified sodium silicate adhesive in the sodium silicate sand has more excellent normal temperature wet strength and better thixotropy and rheological property and is high in reaction bonding activity and friendly to environment, the dosage is smaller, and collapsibility can be improved significantly; in addition, calcium aluminate added into raw materials can assist to purify substances such as sulfur and oxygen which are produced in the pouring process and reduce harmful influence of the substances on the casting, the heat-shock resistance of the casting sand is effectively improved through boron glass powder, and the service life of the casting sand and the precision of the casting are improved; nano-calcium fluoride loaded by bentonite is dispersed in the sand material and has the effects of lubrication and enhancement, a non-stick impervious layer can be formed, and sand burning of the casting are avoided. The composite modified sodium silicate sand is good in comprehensive performance, not prone to hydrating and metamorphosis, efficient and durable, and the pouring requirement for the high-precision pump valve casting can be met.

Description

A kind of pump valve foundry goods anti-thermal shock high efficiency composition modified sodium silicate sand and preparation method thereof
Technical field
The present invention relates to water-glass sand technical field, particularly relate to a kind of pump valve foundry goods anti-thermal shock high efficiency composition modified sodium silicate sand 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 a kind of pump valve foundry goods anti-thermal shock high efficiency composition modified sodium silicate sand and preparation method thereof.
The present invention is achieved by the following technical solutions:
A kind of pump valve foundry goods anti-thermal shock high efficiency composition modified sodium silicate sand, this water-glass sand is prepared by the raw material of following weight portion: 50-60 order quartz sand 60-80,80-100 order calcium aluminate powder 30-40, discarded graphite powder 2-3, boron glass powder 1-2, 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 described a kind of pump valve foundry goods anti-thermal shock high efficiency composition modified sodium silicate sand 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, calcium aluminate powder, discarded graphite powder, boron glass 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, reaction bonded activity is high for thixotropy and rheological characteristic, and environmental protection, consumption is less, and collapsibility is greatly improved; In addition the calcium aluminate added in raw material can assist the material such as sulphur, oxygen produced in purification casting process to the harmful effect of foundry goods, boron glass powder effectively raises the thermal shock resistance of molding sand, improve the service life of molding sand and the precision of foundry goods, 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 scab; This composite modified water-glass sand high comprehensive performance, not easily hydrochemical metamorphism, highly efficient durable, can meet the cast requirement of high accuracy pump valve foundry goods.
Detailed description of the invention
This embodiment water-glass sand is prepared by the raw material of following weight portion: 50 order quartz sand 60,80 order calcium aluminate powders 30, discarded graphite powder 2, boron glass powder 1, modified water glass bonding agent 1.5, bentonite 2, Choline Chloride 0.1, nano calcium fluoride 0.4,50% ethanol water 8, silane coupler 0.1.
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 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, calcium aluminate powder, discarded graphite powder, boron glass 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: 2.24MPa; Compression strength: 4.62MPa; Gas permeability: 66; Hygroscopicity≤1.5%; Retained strength (800 DEG C) 0.26MPa: reclamation rate >=85%.The casting dimension accuracy obtained is stablized, and yield rate reaches more than 95%.

Claims (3)

1. a pump valve foundry goods anti-thermal shock high efficiency composition modified sodium silicate sand, it is characterized in that, this water-glass sand is prepared by the raw material of following weight portion: 50-60 order quartz sand 60-80,80-100 order calcium aluminate powder 30-40, discarded graphite powder 2-3, boron glass powder 1-2, 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. a kind of pump valve foundry goods anti-thermal shock high efficiency composition modified sodium silicate sand 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 a kind of pump valve foundry goods anti-thermal shock high efficiency composition modified sodium silicate sand 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, calcium aluminate powder, discarded graphite powder, boron glass 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.
CN201510833980.8A 2015-11-25 2015-11-25 Heat-shock resistant efficient composite modified sodium silicate sand for pump valve casting and preparation method thereof Pending CN105414463A (en)

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CN106001393A (en) * 2016-06-22 2016-10-12 马鞍山市创诚铸造有限公司 Environment-friendly foundry sand serving as binder and formed by modifying animal glue through chitosan and preparation method of environment-friendly foundry sand

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Application publication date: 20160323