CN108188339A - A kind of casting precoated sand for having anti-sintering and low expansion energy - Google Patents
A kind of casting precoated sand for having anti-sintering and low expansion energy Download PDFInfo
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- CN108188339A CN108188339A CN201711489945.4A CN201711489945A CN108188339A CN 108188339 A CN108188339 A CN 108188339A CN 201711489945 A CN201711489945 A CN 201711489945A CN 108188339 A CN108188339 A CN 108188339A
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- powder
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- precoated sand
- sintering
- low expansion
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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
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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
Abstract
The present patent application discloses a kind of casting precoated sand for having anti-sintering and low expansion energy, prepared by the raw material including following mass fraction：100 parts of aggregate sands, 0.8~3.5 part of resin, 0.2~5 part of compound additive, 0~0.5 part of water, 0~1 part of methenamine and 0~0.5 part of calcium powder；The compound additive includes following raw material components by weight：100 parts of silicon powder, 1~10 part of superfine alumina powder, 1~15 part of spherical ceramic powder, 4~50 parts of reproducibility additive, 0.1~10 part of composite polymer material.The precoated sand of the present invention has fusing point, temperature flowing, high temperature compression strength, agglomeration resistance rate, low thermal expansion and the excellent properties such as expansion behavior and high temperature resistant time of more conventional precoated sand higher (more preferable).
Description
Technical field
A kind of precoated sand technical field of the present invention, and in particular to casting overlay film for having anti-sintering and low expansion energy
Sand.
Background technology
Coated sand is one of major auxiliary burden in casting industry.In casting process sand is prepared into using coated sand
Core, group core, cast achieve the purpose that prepare casting.
Foundry resin precoated sand is combined by refractory aggregate and macromolecule resin, and coated sand is in mold during coremaking
In be heated and be cured reaction, by granular precoated sand consolidation become have definite shape sand core, single sand core quilt
Cast is used alone as metal casting in combination.Casting is divided into non-ferrous metals casting by material type difference and ferrous metal is cast
It makes, the pouring temperature of non-ferrous metals casting is relatively low, and the cast aluminium in non-ferrous metals casting is usually at 700 DEG C, and cast copper is on 1250 DEG C of left sides
The right side, and the cast iron temperature in ferrous metal casting is in 1320 to 1450 DEG C of ranges, the pouring temperature higher of cast steel, generally up to
To 1450 to 1530 DEG C or more, therefore, during using coated sand as molding sand material, it is necessary to which there is good heat-resisting quantity
Energy.
The high temperature resistance of ferrous metal casting resin precoated sand, except the fundamental characteristics with requirement of engineering is (immediately strong
Degree, mobility, fusing point, normal temperature strength, gas forming amount and gas forming rate) except, it is also necessary to it is swollen with the sand core high temperature being prepared
Swollen property is relatively low, the resin thermal chemical reaction under hot conditions is relatively slow and the carbon left that arrives is relatively high, under the conditions of high temperature resistant
The characteristics such as resistance to fracture, sand core integrality under the high temperature conditions, high temperature resistance scab, higher precoated sand fusing point.
The hot properties detection method of usual casting resin precoated sand is that coated sand is made standard sample block,
By test integrality under 1000 DEG C of constant temperature after the change in size of sample block, the thermal chemical reaction of sample block and fracture or
Undergone duration is crushed to judge, in order to reach good heat-resisting quantity, generally use has the phenolic aldehyde tree of higher molecular weight
Fat, using the aggregate (quartz sand, ceramsite sand, white fused alumina sand, the mullite sand of such as high silicon content) with higher refractoriness with
Its heat-resisting ability is improved from the angle of material.Also have and some are added when preparing coated sand with slightly lower compared with aggregate one
A little inorganic additives (such as albite, potassium feldspar, anorthite, brown iron oxide), using organic added material (such as silane,
Fire retardant, plasticizer etc.), to realize the purpose for improving high temperature resistance.But existing method using addition inorganic additive or
After the organic added material of person, the high temperature resistance of precoated sand is still bad.
Invention content
It is of the invention the purpose of the present invention is to provide a kind of casting precoated sand for having anti-sintering and low expansion energy
Precoated sand has the fusing point of more conventional precoated sand higher (more preferable), temperature flowing, high temperature compression strength, agglomeration resistance rate, low swollen
Swollen rate and and the excellent properties such as expansion behavior and high temperature resistant time.
In order to achieve the above objectives, base case of the invention is as follows：
It is prepared by a kind of casting precoated sand for having anti-sintering and low expansion energy, the raw material including following mass fraction：
100 parts of aggregate sands, 0.8~3.5 part of resin, 0.2~5 part of compound additive, 0~0.5 part of water, 0~1 part of methenamine and 0~
0.5 part of calcium powder；The compound additive includes following raw material components by weight：100 parts of silicon powder, superfine alumina powder
1~10 part, 1~15 part of spherical ceramic powder, 4~50 parts of reproducibility additive, 0.1~10 part of composite polymer material.
Have anti-sintering and the preparation method of the casting precoated sand of low expansion energy the present invention also provides a kind of, including
Following steps：
(1) 100 parts of sand are heated to 110~230 DEG C；
(2) 0.8~3.5 part of resin is added in, while adds in 0.2~5 part of compound additive；
(3) 0~0.5 part of water is added in；
(4) 0~1 part of methenamine is added in；
(5) 40~80s of blowing cooling；
(6) 0~0.5 part of calcium powder is added in shake out after mixing.
In the coated sand of this programme, 0.2~5 part of compound additive is added, the resin coating being prepared can be made
Sand has the following advantages：
1st, the addition of compound additive improves the overall room temperature film hardness of resin, reduces the relative friction of overlay film sand grains
Coefficient and melted by heating rate improve the fusing point of precoated sand and the ability for being sent to distal lumen end in die material, together
When sand core compactibility and surface smoothness also improved；
2nd, using the proportioning mixture of the inorganic oxide of the compound additive by (600-2000 DEG C) effect of high temperature
When agglutinating property so that its high temperature compression strength is improved；
3rd, the addition of the compound additive improves the overall room temperature film hardness of resin, reduces melted by heating rate, institute
There is better anticaking capacity with the coated sand of preparation；
4th, the reproducibility component having using compound additive can make precoated sand tree when by high temperature (600-2000 DEG C)
Adipose membrane heat scission reaction slows down；
5th, there is the graphite in additive high heat transfer coefficient to accelerate high temperature that sand core surface is subject to quickly to sand core inner layer
Transmission, reduce sand core surface heating rate cause sand core elevated temperature strength decay slack-off and sand core expansion rate decline and
Expansion behavior changes, maximum swelling time lengthening, advantageously reduces expansion class defect Probability；
6th, one layer is formed because the sieve and silica-sesquioxide in additive issues heat producing chemical reaction-sintered in the collaboration of other components
Inorganic thin film so that the elevated temperature strength of resin carbonation loss obtains reinforcement, while sand core bears metal hydraulic under high temperature environment
The ability of power and shearing force greatly improves, i.e., coated sand sand core high temperature deformation amount is reduced, while high temperature resistance is changed
It is kind.
Further, 100 parts of the aggregate sand, 2 parts of resin, 1.2 parts of compound additive, 0.1 part of water, 0.3 part of methenamine
With 0.1 part of calcium powder.Inventor in experiments it is found that, using said ratio component prepare precoated sand comprehensive performance more preferably.
Further, 1~8 part of the superfine alumina powder, 2~9 parts of spherical ceramic powder, 5~20 parts of reproducibility additive are multiple
Close 0.5~6 part of high molecular material.Inventor in experiments it is found that, using the compound additive of above-mentioned content range, preparation can be made
The performance of obtained coated sand is more excellent.
Further, the compound additive is prepared using following steps：
(1) preparatory process, prepares 100 parts of silicon powder, 1~10 part of superfine alumina powder, and 1~15 part of spherical ceramic powder is gone back
4~50 parts of originality additive, 0.1~10 part of composite polymer material, and silicon powder, superfine alumina powder is respectively dried；
(2) it sieves, the raw material that step (1) prepares is sieved respectively, the grain size for controlling silicon powder is 38~110um, ultra-fine
The grain size of alumina powder is 40~60um, and the grain size of spherical ceramic powder is 0.5~100um, and the grain size of reproducibility additive is 40
~80um, the grain size of composite polymer material is 100~180um；
(3) above-mentioned raw materials are respectively charged into mixed powder machine by batch mixing, and it is 8~50r/min to control the rotating speed of mixed powder machine, batch mixing 5
~120min, batch mixing carry out blowing after completing；
(4) crush, sieve, step (3) mixed material crush and is sieved, control 4 mesh less than equal to
2%, 10% is less than or equal on 10 mesh；
(5) raw material of the lower part of screen point after sieving, which is packed, obtains compound additive finished product.
Further, the reproducibility additive includes the mixture of graphite powder and metallic salt substance, graphite powder and metal
The mass ratio of salts substances is 1:0.5~1:6.5.
Further, the composite polymer material includes the mixture of surfactant and silicone, surfactant and silicon
The mass ratio of ketone is 50:1~5:1.
Further, the pH value 3~10 of 1% aqueous solution of the composite polymer material.
Further, SiO in the silicon powder2Content be more than 80%, the average grain diameter of silicon powder is less than 75um..
Further, the temperature heated in the step of preparation method (1) is 128~150 DEG C
Specific embodiment
It is further described below by specific embodiment：
It is described in detail by taking embodiment 1 as an example below, other embodiment is shown in table, the unshowned part in table
It is same as Example 1.
The present inventor in experiments it is found that, precoated sand of the invention it is anti-sintering and low expansion can mainly add in
Compound additive, so in following embodiment, is compared, except compound mainly for the changes of contents of compound additive
Raw material components and treatment process other than additive are not compared individually, each component content range disclosed in this programme,
And treatment process parameter area can solve the technical issues of present invention.
Aggregate sand used in following embodiment can be in roughing sand, reclaimed sand, nice foundry sand, ceramsite sand, chromite
One or several kinds of mixtures.
Embodiment 1
It is prepared by a kind of casting precoated sand for having anti-sintering and low expansion energy, the raw material including following mass fraction：
100 parts of aggregate sands, 2 parts of resins, 1.2 parts of compound additives, 0.1 part of water, 0.3 part of methenamine and 0.2 part of calcium powder；It is described compound
Additive includes following raw material components by weight：100 parts of silicon powder, 1 part of superfine alumina powder, 1 part of spherical ceramic powder,
4 parts of reproducibility additive, 0.1 part of composite polymer material.
Reproducibility additive includes the mixture of graphite powder and metallic salt substance, the matter of graphite powder and metallic salt substance
Amount is than being 1:0.5~1:6.5, the mass ratio of graphite powder and metallic salt substance is 1 in the present embodiment:3.Graphite powder includes soil Like
Ink, crystalline flake graphite；Metal salt compound include sodium carbonate, ferrous carbonate, soda, sodium bicarbonate, calcium carbonate, calcium bicarbonate,
Magnesium carbonate, potassium carbonate and other carbonate or the mineral exclusive use containing carbonate or their mixture.
Composite polymer material includes the mixture of surfactant and silicone, and the mass ratio of surfactant and silicone is
50:1~5:1, the mass ratio of surfactant and silicone is 10 in the present embodiment:1.
The present embodiment has anti-sintering and the casting of low expansion energy with precoated sand using following steps preparation：
(1) 100 parts of aggregate sands are heated to 110~230 DEG C, the heating temperature of this implementation is 130 DEG C；
(2) 2 parts of resins are added in, while add in 1.2 parts of compound additives；
(3) 0.1 part of water is added in；
(4) 0.3 part of methenamine is added in；
(5) blowing cooling 60 seconds；
(6) 0.2 part of calcium powder is added in shake out after mixing.
In the present embodiment, compound additive is prepared using following steps：
(1) preparatory process prepares 100 parts of silicon powder, 1 part of superfine alumina powder, 1 part of spherical ceramic powder, reproducibility addition
4 parts of agent, 0.1 part of composite polymer material, and silicon powder, superfine alumina powder is respectively dried；
(2) it sieves, the raw material that step (1) prepares is sieved respectively, the grain size for controlling silicon powder is 38~110um, ultra-fine
The grain size of alumina powder is 40~60um, and the grain size of spherical ceramic powder is 0.5~100um, and the grain size of reproducibility additive is 40
~80um, the grain size of composite polymer material is 100~180um；
(3) above-mentioned raw materials are respectively charged into mixed powder machine by batch mixing, and it is 8~50r/min to control the rotating speed of mixed powder machine, batch mixing 5
~120min, batch mixing carry out blowing after completing；
(4) crush, sieve, step (3) mixed material crush and is sieved, control 4 mesh less than equal to
2%, 10% is less than or equal on 10 mesh；
(5) raw material of the lower part of screen point after sieving, which is packed, obtains compound additive finished product.
In 1-6 of the embodiment of the present invention, the content of each component is different in compound additive, specific as shown in table 1：
Table 1
Comparative example 1 is not add in the precoated sand prepared during precoated sand additive, and detection respectively adds in the various embodiments described above
The performances such as instant bending resistance, room temperature bending resistance, fusing point, temperature flowing with the precoated sand of comparative example preparation, obtain following test knot
Fruit：
Table 2
Examples 1 to 6 is the precoated sand for having used and having been prepared after compound additive from upper table, and comparative example 1 is not then to add
Enter the precoated sand prepared during compound additive, from test result as can be seen that the room temperature bending resistance of precoated sand in Examples 1 to 6,
Fusing point, temperature flowing, high temperature compression strength, caking rate, maximum swelling rate, maximum swelling time and high temperature resistant time performance are equal
It is substantially better than the performance for not adding in compound additive.
Above-described is only the embodiment of the present invention, and the common sense such as well known characteristic do not describe excessively herein in scheme.
It should be pointed out that for those skilled in the art, without departing from the inventive concept of the premise, several changes can also be made
Shape and improvement, these should also be considered as protection scope of the present invention, these all do not interfere with the effect and patent that the present invention is implemented
Practicability.The scope of protection required by this application should be based on the content of the claims, the specific embodiment party in specification
The records such as formula can be used for explaining the content of claim.
Claims (10)
1. a kind of casting precoated sand for having anti-sintering and low expansion energy, which is characterized in that including following mass fraction
It is prepared by raw material：100 parts of aggregate sands, 0.8~3.5 part of resin, 0.2~5 part of compound additive, 0~0.5 part of water, 0~1 part of black Lip river
Tropine and 0~0.5 part of calcium powder；
The compound additive includes following raw material components by weight：100 parts of silicon powder, superfine alumina powder 1~10
Part, 1~15 part of spherical ceramic powder, 4~50 parts of reproducibility additive, 0.1~10 part of composite polymer material.
2. a kind of casting precoated sand for having anti-sintering and low expansion energy according to claim 1, which is characterized in that
0.1 part of 100 parts of the aggregate sand, 2 parts of resin, 1.2 parts of compound additive, 0.1 part of water, 0.3 part of methenamine and calcium powder.
3. a kind of casting precoated sand for having anti-sintering and low expansion energy according to claim 1, which is characterized in that
1~8 part of the superfine alumina powder, 2~9 parts of spherical ceramic powder, 5~20 parts of reproducibility additive, composite polymer material 0.5
~6 parts.
4. a kind of casting precoated sand for having anti-sintering and low expansion energy according to claim 1, which is characterized in that
The compound additive is prepared using following steps：
(1) preparatory process prepares 100 parts of silicon powder, 1~10 part of superfine alumina powder, 1~15 part of spherical ceramic powder, reproducibility
4~50 parts of additive, 0.1~10 part of composite polymer material, and silicon powder, superfine alumina powder is respectively dried；
(2) it sieves, the raw material that step (1) prepares is sieved respectively, control the grain size of silicon powder as 38~110um, ultra-fine oxidation
The grain size of aluminium powder is 40~60um, and the grain size of spherical ceramic powder is 0.5~100um, the grain size of reproducibility additive for 40~
80um, the grain size of composite polymer material is 100~180um；
(3) above-mentioned raw materials are respectively charged into mixed powder machine by batch mixing, and it is 8~50r/min to control the rotating speed of mixed powder machine, and batch mixing 5~
120min, batch mixing carry out blowing after completing；
(4) it crushes, sieve, step (3) mixed material is crushed and sieved, 4 mesh of control are less than equal to 2%, 10
It is less than or equal to 10% on mesh；
(5) raw material of the lower part of screen point after sieving, which is packed, obtains compound additive finished product.
5. a kind of casting precoated sand for having anti-sintering and low expansion energy according to claim 1, which is characterized in that
The reproducibility additive includes the mixture of graphite powder and metallic salt substance, the mass ratio of graphite powder and metallic salt substance
It is 1:0.5~1:6.5.
6. a kind of casting precoated sand for having anti-sintering and low expansion energy according to claim 1, which is characterized in that
The mass ratio of mixture of the composite polymer material including surfactant and silicone, surfactant and silicone is 50:1
~5:1.
7. according to a kind of casting precoated sand for having anti-sintering and low expansion energy of claim 1-6 any one of them,
It is characterized in that, the pH value 3~10 of 1% aqueous solution of the composite polymer material.
8. according to a kind of casting precoated sand for having anti-sintering and low expansion energy of claim 1-6 any one of them,
It is characterized in that, SiO in the silicon powder2Content be more than 80%, the average grain diameter of silicon powder is less than 75um.
9. a kind of preparation method for the casting precoated sand for having anti-sintering and low expansion energy, which is characterized in that including as follows
Step：
(1) 100 parts of aggregate sands are heated to 110~230 DEG C；
(2) 0.8~3.5 part of resin is added in, while adds in 0.2~5 part of compound additive；
(3) 0~0.5 part of water is added in；
(4) 0~1 part of methenamine is added in；
(5) 40~80s of blowing cooling；
(6) 0~0.5 part of calcium powder is added in shake out after mixing.
10. a kind of preparation method of casting precoated sand for having anti-sintering and low expansion energy according to claim 9,
It is characterized in that, the temperature heated in step (1) is 128~150 DEG C.
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| CN201711489945.4A CN108188339B (en) | 2017-12-29 | 2017-12-29 | Precoated sand for casting with sintering resistance and low expansion performance |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110216237A (en) * | 2019-07-25 | 2019-09-10 | 盐城仁创砂业科技有限公司 | A kind of steel-casting precoated sand additive and the preparation method and application thereof |
| CN112589042A (en) * | 2020-12-10 | 2021-04-02 | 含山县朝霞铸造有限公司 | Additive for steel casting precoated sand and preparation method and application thereof |
| CN113770297A (en) * | 2021-09-09 | 2021-12-10 | 合肥仁创铸造材料有限公司 | Self-heat-absorption precoated sand and preparation method thereof |
| CN113857421A (en) * | 2021-09-29 | 2021-12-31 | 江西特欣实业有限公司 | Preparation method and application of wet precoated sand |
| CN117510510A (en) * | 2024-01-08 | 2024-02-06 | 中北大学 | Preparation method of Sha Zhuang urotropine difficult to agglomerate |
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| CN106807881A (en) * | 2017-02-06 | 2017-06-09 | 柳州市柳晶科技有限公司 | Casting precoated sand and its manufacture method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110216237A (en) * | 2019-07-25 | 2019-09-10 | 盐城仁创砂业科技有限公司 | A kind of steel-casting precoated sand additive and the preparation method and application thereof |
| CN110216237B (en) * | 2019-07-25 | 2020-12-29 | 盐城仁创砂业科技有限公司 | Additive for steel casting precoated sand and preparation method and application thereof |
| CN112589042A (en) * | 2020-12-10 | 2021-04-02 | 含山县朝霞铸造有限公司 | Additive for steel casting precoated sand and preparation method and application thereof |
| CN113770297A (en) * | 2021-09-09 | 2021-12-10 | 合肥仁创铸造材料有限公司 | Self-heat-absorption precoated sand and preparation method thereof |
| CN113857421A (en) * | 2021-09-29 | 2021-12-31 | 江西特欣实业有限公司 | Preparation method and application of wet precoated sand |
| CN113857421B (en) * | 2021-09-29 | 2023-02-14 | 江西特欣实业有限公司 | Preparation method and application of wet precoated sand |
| CN117510510A (en) * | 2024-01-08 | 2024-02-06 | 中北大学 | Preparation method of Sha Zhuang urotropine difficult to agglomerate |
| CN117510510B (en) * | 2024-01-08 | 2024-03-19 | 中北大学 | Preparation method of Sha Zhuang urotropine difficult to agglomerate |
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