CN106552902B - Efficient anti-vein type precoated sand and preparation method thereof - Google Patents
Efficient anti-vein type precoated sand and preparation method thereof Download PDFInfo
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- CN106552902B CN106552902B CN201710023702.5A CN201710023702A CN106552902B CN 106552902 B CN106552902 B CN 106552902B CN 201710023702 A CN201710023702 A CN 201710023702A CN 106552902 B CN106552902 B CN 106552902B
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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
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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
- B22C1/16—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
- B22C1/20—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 organic agents
- B22C1/22—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 organic agents of resins or rosins
- B22C1/2233—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 organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
Abstract
The present invention relates to efficient anti-vein type precoated sand and preparation method thereof, the efficiently anti-vein type precoated sand includes: 88~92 parts of mixed sand, 1~4 part of binder, 0.1~0.8 part of curing agent, 0.001~0.02 part of reinforcing agent, 0.01~0.2 part of lubricant, 0.45~4.5 part of tolerance composite powder and 0.9~9 part of additive according to mass fraction.Efficient anti-vein type precoated sand of the invention, using quartz sand, zircon sand, olivine sand and spodumene sand as raw material, it is prepared in conjunction with binder, curing agent, reinforcing agent, lubricant, tolerance composite powder and additive, interacts between each component, there is extremely strong anti-vein ability.Meanwhile simple production process, reaction condition is mild, and production cost is low, and the precoated sand intensity produced is high, mobility is big, heat-resist.
Description
Technical field
The present invention relates to founding materials technical fields, and in particular to efficient anti-vein type precoated sand and preparation method thereof.
Background technique
With advances in technology with the development of society, consumer is higher and higher to the quality requirement of product, and precoated sand refers to
The molding sand or core sand of one layer of hard resin are covered with before moulding on sand grain surface, because it is high with intensity, gas forming amount is low, production casting
The advantages that part dimensional accuracy is high, convenient for saving, in recent years using increasingly extensive in the casting fields such as steel-casting, ironcasting.
Conventional coating technique has cold process and two kinds of thermal method: cold process is dissolved resin using ethyl alcohol, and during mulling
Methenamine is added, the two is made to be coated on sand grain surface, ethyl alcohol volatilization obtains precoated sand；Thermal method is that sand is preheating to certain temperature,
Resin is added to make its melting, stirring makes resin be coated on sand grain surface, is added methenamine aqueous solution and lubricant, cooling, broken,
Precoated sand is obtained after screening.
The Chinese patent literature of Publication No. CN103567357A discloses a kind of Anti-vein precoated sand and preparation method thereof,
The precoated sand includes that quartz sand, menaccanite, spodumene, boric acid, thermoplastic phenolic resin, thermosetting phenolic resin, cement are ripe
Material, spent pulping liquor, corn flour, sesbania gum, ammonium benzoate, gamma-aminopropyl-triethoxy-silane, dioctyl phthalate,
Methenamine, calcium stearate and composite powder are added to many auxiliary agents on the basis of roughing sand.Although reducing to a certain extent
The generation of vein, but component contained by the precoated sand is excessive, preparation method is complicated, condition is harsh, is unfavorable for being mass produced；
Contain a large amount of harmful substances in material, does not have environmentally protective requirement, and the patent document is only prepared in the prior art
The combination of precoated sand basic material, there is no disclose influence of the every kind of each component to precoated sand performance.
The Chinese patent literature of Publication No. CN104889313A discloses a kind of precoated sand preparation method, which is making
It joined liquid phenolic resin during making, and reduce the content of the addition of methenamine, thus reduce precoated sand production
The generation of pernicious gas in the process is not obviously improved the properties of precoated sand although bringing certain environment protecting.
Therefore, it to the performance of improvement precoated sand, needs to make and being correspondingly improved for component and preparation method.
Summary of the invention
The efficient anti-vein type precoated sand that the purpose of the present invention is to provide a kind of components is simple, intensity is high, heat resistance is strong
And preparation method thereof, to solve the problems, such as that precoated sand component is many and diverse in the prior art, heat resistance is low, anti-vein ability is poor.
To achieve the above object, the present invention provides efficient anti-vein type precoated sands.Specifically, the efficiently anti-vein type
Precoated sand includes: 88~92 parts of mixed sand, 1~4 part of binder, 0.1~0.8 part of curing agent, reinforcing agent according to mass fraction
0.001~0.02 part, 0.01~0.2 part of lubricant, 0.45~4.5 part of tolerance composite powder and 0.9~9 part of additive.
Preferably, the efficiently anti-vein type precoated sand includes: 89~91 parts of mixed sand, binder 2 according to mass fraction
~3 parts, 0.3~0.6 part of curing agent, 0.006~0.014 part of reinforcing agent, 0.06~0.14 part of lubricant, tolerance composite powder
2.5~4 parts and 4~8 parts of additive.
Preferably, the efficiently anti-vein type precoated sand according to mass fraction include: 90 parts of mixed sand, it is 3 parts of binder, solid
0.55 part of agent, 0.012 part of reinforcing agent, 0.12 part of lubricant, 3.6 parts of tolerance composite powder and 7.2 parts of additive.
Preferably, the mixed sand according to mass fraction include: 1~5 part of quartz sand, 1~3 part of zircon sand, olivine sand 1~
3 parts and 1~2 part of spodumene sand.
Preferably, the mixed sand includes: 2 parts of quartz sand, 3 parts of zircon sand, 3 parts of olivine sand and lithium brightness according to mass fraction
2 parts of stone sand.
Preferably, the binder is thermoplastic phenolic resin, and the curing agent is hexa, the reinforcing agent
For γ-glycidyl ether oxygen propyl trimethoxy silicane, the lubricant is calcium stearate, and the additive is iron oxide.
Preferably, the tolerance composite powder is one of coal dust, sawdust or alphalise starch or a variety of.
Preferably, the tolerance composite powder includes: 2~7 parts of coal dust, 3~8 parts of sawdust and alphalise starch according to mass fraction
1~5 part.
Preferably, the tolerance composite powder includes: 5 parts of coal dust, 3 parts of sawdust and 2 parts of alphalise starch according to mass fraction.
Second aspect of the present invention provides the preparation method of efficient anti-vein type precoated sand.Specifically, the preparation method
Include the following steps: for mixed sand and additive to be put into sand mixer, is heated to 120~150 DEG C；Addition reinforcing agent, mixed grind 5~
10s, addition binder, 15~25s of mixed grind, addition tolerance composite powder, 5~10s of mixed grind, addition curing agent, mixed grind 30~
Lubricant is added in 60s, is uniformly mixed, is cooled to 60~80 DEG C, and broken, screening obtains precoated sand.
The present invention has the advantage that
1, efficient anti-vein type precoated sand of the invention, with mixed sand, binder, curing agent, reinforcing agent, lubricant, appearance
Allowing property composite powder and additive optimization compound, and interact between each component, can effectively reduce the thermal expansion coefficient of precoated sand,
Alleviate molding sand or core sand rapid expanding, so that thermal stress caused by after precoated sand is heated is small, enhances the anti-vein of precoated sand
Energy.
2, the binder in efficient anti-vein type precoated sand of the invention and tolerance composite powder are in high temperature preparation process
Burning ashing, forms many gaps in sand or core sand, and the expansion of mixture sand when can accommodate high temperature absorbs thermal stress, further
Prevent sand or core sand surface from cracking.
3, efficient anti-vein type precoated sand of the invention, significantly improves sand or core sand surface by the proportion between each component
Chilling action, solidify molten metal quickly, reduce vein tendency；Meanwhile additive component can be in sand after precoated sand is heated
Intergranular forms bridging and connects, to further prevent sand or core sand cracking.
4, the present invention is using quartz sand, zircon sand, olivine sand and spodumene sand as raw material, in conjunction with binder, curing agent, increasing
Strong agent, lubricant, tolerance composite powder and additive are prepared, and there is material to be easy to obtain, and simple production process reacts item
Part is mild, and production cost is low, is easy to the characteristics of being mass produced, and has excellent anti-vein performance.
Specific embodiment
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
Embodiment 1
The preparation method of the efficient anti-vein type precoated sand of the present embodiment, prepares according to the following steps: by 18 parts of quartz sand, zirconium
27 parts of sand, 27 parts of olivine sand, 18 parts of spodumene sand and 7.2 parts of iron oxide are put into sand mixer, are heated to 130 DEG C；γ-is added
0.012 part of glycidyl ether oxygen propyl trimethoxy silicane, mixed grind 5s, 3 parts of thermoplastic phenolic resin, mixed grind 18s are added, is added
1.8 parts of coal dust, 1.08 parts of sawdust and 0.72 part of alphalise starch, mixed grind 5s are added 0.55 part of hexa, mixed grind 55s, are added
It 0.12 part of calcium stearate, is uniformly mixed, is cooled to 70 DEG C, broken, screening obtains precoated sand.
Embodiment 2
The preparation method of the efficient anti-vein type precoated sand of the present embodiment, prepares according to the following steps: by 18.4 parts of quartz sand,
27.6 parts of zircon sand, 27.6 parts of olivine sand, 18.4 parts of spodumene sand and 9 parts of iron oxide are put into sand mixer, are heated to 150 DEG C；
It is added 0.014 part of γ-glycidyl ether oxygen propyl trimethoxy silicane, mixed grind 6s, is added 4 parts of thermoplastic phenolic resin, mixed grind
15s is added 4 parts of alphalise starch, mixed grind 7s, is added 0.1 part of hexa, mixed grind 45s, is added 0.14 part of calcium stearate, mixes
It closes uniformly, is cooled to 80 DEG C, broken, screening obtains precoated sand.
Embodiment 3
The preparation method of the efficient anti-vein type precoated sand of the present embodiment, prepares according to the following steps: by 22 parts of quartz sand, zirconium
22 parts of sand, 22 parts of olivine sand, 22 parts of spodumene and 8 parts of iron oxide are put into sand mixer, are heated to 140 DEG C；γ-shrink is added
0.006 part of glycerol ether oxygen propyl trimethoxy silicane, mixed grind 9s, it is added 1 part of thermoplastic phenolic resin, mixed grind 22s, coal dust is added
1.5 parts, 2.25 parts of sawdust and 0.75 part of alphalise starch, mixed grind 7s are added 0.3 part of hexa, mixed grind 30s, are added stearic
0.2 part of sour calcium is uniformly mixed, is cooled to 60 DEG C, and broken, screening obtains precoated sand.
Embodiment 4
The preparation method of the efficient anti-vein type precoated sand of the present embodiment, prepares according to the following steps: by 38 parts of quartz sand, zirconium
15 parts of sand, 23 parts of olivine sand, 15 parts of spodumene sand and 4 parts of iron oxide are put into sand mixer, are heated to 135 DEG C；γ-contracting is added
0.001 part, mixed grind 10s of water glycerol ether oxygen propyl trimethoxy silicane, 2 parts of thermoplastic phenolic resin, mixed grind 25s are added, is added
0.875 part of coal dust, 1 part of sawdust and 0.625 part of alphalise starch, mixed grind 8s are added 0.8 part of hexa, mixed grind 35s, are added
It 0.01 part of calcium stearate, is uniformly mixed, is cooled to 68 DEG C, broken, screening obtains precoated sand.
Embodiment 5
The preparation method of the efficient anti-vein type precoated sand of the present embodiment, prepares according to the following steps: by 35.6 parts of quartz sand,
26.7 parts of zircon sand, 17.8 parts of olivine sand, 8.9 parts of spodumene sand and 0.9 part of iron oxide are put into sand mixer, are heated to 120 DEG C；
It is added 0.02 part of γ-glycidyl ether oxygen propyl trimethoxy silicane, mixed grind 6s, is added 3 parts of thermoplastic phenolic resin, mixed grind
16s is added 0.2 part and 0.25 part of sawdust, mixed grind 10s of coal dust, is added 0.6 part of hexa, mixed grind 60s, is added stearic
0.06 part of sour calcium is uniformly mixed, is cooled to 72 DEG C, and broken, screening obtains precoated sand.
Table 1 is the efficient anti-vein type precoated sand intensity and expansion rate that Examples 1 to 5 is prepared
From table 1 it follows that the room temperature bending strength for the efficient anti-vein type precoated sand that Examples 1 to 5 is prepared
In 8.0MPa or so, and existing product is 7.0Mpa or so；The efficient anti-vein type precoated sand that Examples 1 to 5 is prepared
Hot bending strength in 3.0MPa or so, existing product only has 2.50 or so, that is to say, that Examples 1 to 5 is prepared
Efficient anti-vein type precoated sand in room temperature bending strength and hot bending strength this two performances better than existing product.Its
Secondary, the expansion rate for the efficient anti-vein type precoated sand that Examples 1 to 5 is prepared is by about one time lower than existing product, hence it is evident that small
In the expansion rate of common precoated sand.
Table 2 be the efficient anti-vein type precoated sand that is prepared of Examples 1 to 5 in 3min the mobility of precoated sand and at
Type rate
From Table 2, it can be seen that the mobility and molding of the efficient anti-vein type precoated sand that Examples 1 to 5 is prepared
The efficient anti-vein type precoated sand highest that rate is prepared with embodiment 1, the height of component and preparation method preparation according to the invention
Imitate anti-vein type precoated sand mobility in 24g or so, ratio of briquetting 99 or more, be significantly higher than existing product mobility and
Ratio of briquetting.
Firstly, the efficiently anti-vein type precoated sand of the present invention, by mixed sand, binder, curing agent, reinforcing agent, lubricant, appearance
Allowing property composite powder and additive form according to a certain weight ratio, can effectively reduce the thermal expansion coefficient of precoated sand, remission form (core)
Sand rapid expanding, so that thermal stress caused by after precoated sand is heated is small, sand mold (core) is not easy to crack.Secondly, in the present invention
Binder and tolerance composite powder can burn ashing at high temperature, form many gaps, in sand mold (core) come when accommodating high temperature
The expansion of mixed sand absorbs thermal stress, prevents sand mold (core) surface from cracking.
In addition, the chilling action on sand mold (core) surface can be significantly improved according to weight proportion provided by the invention and component,
It solidifies molten metal quickly, reduces vein tendency；By adding additive, bridging can be formed between sand grains after precoated sand is heated
It connects, as temperature increases, these connection deformations increase the thermoplasticity of type (core) sand, prevent sand mold (core) from cracking, to reduce
The vein defect generated by sand core face crack.
Finally, required group of assignment system is simple the present invention also provides the preparation method of efficient anti-vein type precoated sand, preparation
Method is easily operated, and does not have rigors for equipment, and there is material to be easy to obtain, simple production process, reaction condition
Mildly, the low feature of production cost, product effectively improve casting inside and outside surface quality, are applicable in the production of cast iron, steel-casting.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (6)
1. efficient anti-vein type precoated sand, it is characterised in that: the efficiently anti-vein type precoated sand includes: mixed according to mass fraction
With 88~92 parts of sand, 1~4 part of binder, 0.1~0.8 part of curing agent, 0.001~0.02 part of reinforcing agent, lubricant 0.01~
0.2 part, 0.45~4.5 part of tolerance composite powder and 0.9~9 part of additive,
The mixture sand includes: 1~5 part of quartz sand, 1~3 part of zircon sand, 1~3 part of olivine sand and spodumene according to mass fraction
1~2 part of sand,
The binder is thermoplastic phenolic resin, and the curing agent is hexa, and the reinforcing agent is that γ-shrink is sweet
Oily ether oxygen propyl trimethoxy silicane, the lubricant are calcium stearate, and the additive is iron oxide, and the tolerance is compound
Powder includes: 2~7 parts of coal dust, 3~8 parts of sawdust and 1~5 part of alphalise starch according to mass fraction.
2. efficiently anti-vein type precoated sand according to claim 1, it is characterised in that: the efficiently anti-vein type precoated sand
According to mass fraction include: 89~91 parts of mixed sand, 2~3 parts of binder, 0.3~0.6 part of curing agent, reinforcing agent 0.006~
0.014 part, 0.06~0.14 part of lubricant, 2.5~4 parts of tolerance composite powder and 4~8 parts of additive.
3. efficiently anti-vein type precoated sand according to claim 1, it is characterised in that: the efficiently anti-vein type precoated sand
It include: 90 parts of mixed sand, 3 parts of binder, 0.55 part of curing agent, 0.012 part of reinforcing agent, lubricant 0.12 according to mass fraction
Part, 3.6 parts of tolerance composite powder and 7.2 parts of additive.
4. it is according to claim 1-3 efficiently anti-vein type precoated sand, it is characterised in that: it is described mixture sand according to
Mass fraction includes: 2 parts of quartz sand, 3 parts of zircon sand, 3 parts of olivine sand and 2 parts of spodumene sand.
5. efficiently anti-vein type precoated sand according to claim 4, it is characterised in that: the tolerance composite powder is according to matter
Amount number includes: 5 parts of coal dust, 3 parts of sawdust and 2 parts of alphalise starch.
6. the preparation method of efficiently anti-vein type precoated sand as described in claim 1, it is characterised in that: the preparation method packet
It includes following steps: mixed sand and additive is put into sand mixer, be heated to 120~150 DEG C；Addition reinforcing agent, mixed grind 5~
10s, addition binder, 15~25s of mixed grind, addition tolerance composite powder, 5~10s of mixed grind, addition curing agent, mixed grind 30~
Lubricant is added in 60s, is uniformly mixed, is cooled to 60~80 DEG C, and broken, screening obtains precoated sand.
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| CN112935181A (en) * | 2021-01-29 | 2021-06-11 | 江门市磊茂五金制品有限公司 | Casting sand core resin sand and preparation thereof |
| CN114367628B (en) * | 2021-12-29 | 2023-08-29 | 天阳新材料科技有限公司 | Vein-resistant precoated sand for turbine shell and preparation method thereof |
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