CN107866518B - Environment-friendly high-temperature-resistant precoated sand and preparation method thereof - Google Patents
Environment-friendly high-temperature-resistant precoated sand and preparation method thereof Download PDFInfo
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- CN107866518B CN107866518B CN201711046055.6A CN201711046055A CN107866518B CN 107866518 B CN107866518 B CN 107866518B CN 201711046055 A CN201711046055 A CN 201711046055A CN 107866518 B CN107866518 B CN 107866518B
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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
- B22C1/02—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
- B22C1/14—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 separating the pattern from the mould
-
- 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
- B22C1/2246—Condensation polymers of aldehydes and ketones
- B22C1/2253—Condensation polymers of aldehydes and ketones with phenols
Abstract
The invention discloses environment-friendly high-temperature-resistant precoated sand which comprises the following raw materials in parts by weight: 40-50 parts of natural silica sand, 20-35 parts of zircon sand, 12-14 parts of modified phenolic resin, 1-3 parts of urotropine, 2-4 parts of magnesium stearate, 2-3 parts of zinc stearate, 2-3 parts of diatomite, 2-3 parts of high temperature resistant additive and 1-2 parts of sepiolite. The invention also discloses a preparation method of the environment-friendly high-temperature-resistant precoated sand. The precoated sand disclosed by the invention has good high-temperature resistance, and meanwhile, has good fluidity and demolding property.
Description
Technical Field
The invention relates to precoated sand, in particular to environment-friendly high-temperature-resistant precoated sand and a preparation method thereof.
Background
The precoated sand is molding sand or core sand coated with a layer of solid resin on the surface of sand grains before molding, and has the advantages of high strength, low gas evolution, high dimensional precision of produced castings, convenience in storage and the like, so that the precoated sand is increasingly widely applied to the casting fields of steel castings, iron castings, non-ferrous metal castings, 3D printing and the like in recent years.
However, the existing precoated sand has the defects of low high temperature resistance, poor fluidity, short high-temperature heat-resisting time and the like, and particularly, phenolic resin is frequently used as a binder in the precoated sand, wherein the content of free phenol in the phenolic resin is mostly about 12%, the content of free aldehyde is about 1% -1.5%, and the content is higher, so that phenolic aldehyde with a lower boiling point is inevitably emitted during high-temperature casting, the operation site is easily polluted, and the quality of a casting is influenced due to low bonding strength of common phenolic resin, so that the existing precoated sand cannot meet the requirements of the existing production.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides environment-friendly high-temperature-resistant precoated sand and a preparation method thereof.
The invention provides environment-friendly high-temperature-resistant precoated sand which comprises the following raw materials in parts by weight: 40-50 parts of natural silica sand, 20-35 parts of zircon sand, 12-14 parts of modified phenolic resin, 1-3 parts of urotropine, 2-4 parts of magnesium stearate, 2-3 parts of zinc stearate, 2-3 parts of diatomite, 2-3 parts of high temperature resistant additive and 1-2 parts of sepiolite.
Preferably, the raw materials comprise the following components in parts by weight: 42-47 parts of natural silica sand, 23-32 parts of zircon sand, 12.5-13.5 parts of modified phenolic resin, 1.5-2.5 parts of urotropine, 2.5-3.5 parts of magnesium stearate, 2.2-2.8 parts of zinc stearate, 2.2-2.8 parts of diatomite, 2.1-2.7 parts of high-temperature resistant additive and 1.2-1.8 parts of sepiolite.
Preferably, the weight ratio of the natural silica sand to the zircon sand is 45-46: 24-30.
Preferably, the high temperature resistant additive comprises graphite, aluminum hydroxide and antimony trioxide.
Preferably, the weight ratio of the graphite to the aluminum hydroxide to the antimony trioxide is 1-2: 1-3: 0.5-0.7.
Preferably, the preparation method of the modified phenolic resin comprises the following steps: mixing phenol, formaldehyde aqueous solution and oxalic acid, heating to 70-80 ℃, preserving heat for 2-3h, adding dialdehyde cellulose, continuing heating to 100-110 ℃, preserving heat for 2-3h, cooling, and dehydrating under negative pressure for 1-2h to obtain the modified phenolic resin.
Preferably, in the preparation of the modified phenolic resin, the concentration of the aqueous formaldehyde solution is 37 to 45 wt%.
Preferably, in the preparation of the modified phenolic resin, the molar ratio of phenolic aldehyde is 1: 0.6-0.8.
Preferably, in the preparation of the modified phenolic resin, the weight ratio of phenol, oxalic acid and dialdehyde cellulose is 1: 0.03-0.05: 0.4-0.5.
The invention also provides a preparation method of the environment-friendly high-temperature-resistant precoated sand, which comprises the following steps: weighing the raw materials according to the weight parts of the raw materials, sequentially adding natural silica sand and zircon sand into a sand mixer, heating to the required film coating temperature, adding modified phenolic resin, stirring for 2-3min, cooling, sequentially adding urotropine and a high-temperature resistant additive when the temperature is reduced to 80-90 ℃, stirring for 1-2min, sequentially adding magnesium stearate, zinc stearate, kieselguhr and sepiolite, stirring to a loose sand state, and sieving with a 40-60-mesh sieve to obtain the environment-friendly high-temperature resistant film coating sand.
According to the invention, the dialdehyde cellulose is adopted to modify the phenolic resin, so that the content of free phenol is effectively reduced, the pollution of the free phenol to the environment is reduced, and the bonding strength of the phenolic resin sand with natural silica sand and zircon sand is improved; magnesium stearate and zinc stearate are added and mutually matched to be decomposed at high temperature, so that the magnesium stearate and the zinc stearate can be well compatible with the modified phenolic resin and become an inseparable part in the resin carbon film, the fracture resistance of the modified phenolic resin in a high-temperature environment is improved, the heat bending strength of the precoated sand is further improved, the high-temperature resistance of the precoated sand is enhanced, and the flowability and the demolding property of the precoated sand are improved; the high-temperature resistant additive is added to further improve the high-temperature resistance of the precoated sand, and meanwhile, the aluminum hydroxide, the antimony trioxide and the urotropine in the high-temperature resistant additive are matched with each other, so that the curing effect of the urotropine can be promoted, the curing temperature of the urotropine is reduced, and the anti-shelling performance of the precoated sand is improved; the sepiolite is added to be matched with the natural silica sand and the zirconium sand to improve the thermal stability of the precoated sand.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
The environment-friendly high-temperature-resistant precoated sand comprises the following raw materials in parts by weight: 40 parts of natural silica sand, 35 parts of zircon sand, 12 parts of modified phenolic resin, 3 parts of urotropine, 2 parts of magnesium stearate, 3 parts of zinc stearate, 2 parts of diatomite, 3 parts of high-temperature resistant additive and 1 part of sepiolite.
The preparation method of the environment-friendly high-temperature-resistant precoated sand comprises the following steps: weighing the raw materials according to the weight parts of the raw materials, sequentially adding natural silica sand and zircon sand into a sand mixer, heating to the required film coating temperature, adding modified phenolic resin, stirring for 3min, cooling, sequentially adding urotropine and a high-temperature resistant additive when the temperature is reduced to 80 ℃, stirring for 2min, sequentially adding magnesium stearate, zinc stearate, diatomite and sepiolite, stirring to a loose sand state, and sieving by a 40-mesh sieve to obtain the environment-friendly high-temperature resistant film coating sand.
Example 2
The environment-friendly high-temperature-resistant precoated sand comprises the following raw materials in parts by weight: 50 parts of natural silica sand, 20 parts of zircon sand, 14 parts of modified phenolic resin, 1 part of urotropine, 4 parts of magnesium stearate, 2 parts of zinc stearate, 3 parts of diatomite, 2 parts of high-temperature resistant additive and 2 parts of sepiolite;
wherein the high-temperature resistant additive comprises graphite, aluminum hydroxide and antimony trioxide.
The preparation method of the environment-friendly high-temperature-resistant precoated sand comprises the following steps: weighing the raw materials according to the weight parts of the raw materials, sequentially adding natural silica sand and zircon sand into a sand mixer, heating to the required film coating temperature, adding modified phenolic resin, stirring for 2min, cooling, sequentially adding urotropine and a high-temperature resistant additive when the temperature is reduced to 90 ℃, stirring for 1min, sequentially adding magnesium stearate, zinc stearate, diatomite and sepiolite, stirring to a loose sand state, and sieving by a 60-mesh sieve to obtain the environment-friendly high-temperature resistant film coating sand.
Example 3
The environment-friendly high-temperature-resistant precoated sand comprises the following raw materials in parts by weight: 45 parts of natural silica sand, 30 parts of zircon sand, 13 parts of modified phenolic resin, 2 parts of urotropine, 3 parts of magnesium stearate, 2.5 parts of zinc stearate, 2.5 parts of diatomite, 2.5 parts of high-temperature resistant additive and 1.5 parts of sepiolite;
wherein the high-temperature resistant additive comprises graphite, aluminum hydroxide and antimony trioxide;
the weight ratio of the graphite to the aluminum hydroxide to the antimony trioxide is 1: 3: 0.5.
the preparation method of the environment-friendly high-temperature-resistant precoated sand comprises the following steps: weighing the raw materials according to the weight parts of the raw materials, sequentially adding natural silica sand and zircon sand into a sand mixer, heating to the required film coating temperature, adding modified phenolic resin, stirring for 2.5min, cooling, sequentially adding urotropine and a high-temperature resistant additive when the temperature is reduced to 85 ℃, stirring for 1.5min, sequentially adding magnesium stearate, zinc stearate, kieselguhr and sepiolite, stirring to a loose sand state, and sieving with a 50-mesh sieve to obtain the environment-friendly high-temperature resistant film coating sand.
Example 4
The environment-friendly high-temperature-resistant precoated sand comprises the following raw materials in parts by weight: 42 parts of natural silica sand, 32 parts of zircon sand, 12.5 parts of modified phenolic resin, 2.5 parts of urotropine, 2.5 parts of magnesium stearate, 2.8 parts of zinc stearate, 2.2 parts of diatomite, 2.7 parts of high-temperature resistant additive and 1.2 parts of sepiolite;
wherein the high-temperature resistant additive comprises graphite, aluminum hydroxide and antimony trioxide;
the weight ratio of the graphite to the aluminum hydroxide to the antimony trioxide is 2: 1: 0.7;
the preparation method of the modified phenolic resin comprises the following steps: mixing phenol, formaldehyde aqueous solution and oxalic acid, heating to 70 ℃, preserving heat for 3 hours, adding dialdehyde cellulose, continuously heating to 100 ℃, preserving heat for 3 hours, cooling, and dehydrating under negative pressure for 2 hours to obtain modified phenolic resin;
in the preparation of the modified phenolic resin, the concentration of the formaldehyde aqueous solution is 37 wt%;
in the preparation of the modified phenolic resin, the molar ratio of phenolic aldehyde is 1: 0.8;
in the preparation of the modified phenolic resin, the weight ratio of phenol, oxalic acid and dialdehyde cellulose is 1: 0.03: 0.5.
the preparation method of the environment-friendly high-temperature-resistant precoated sand comprises the following steps: weighing the raw materials according to the weight parts of the raw materials, sequentially adding natural silica sand and zircon sand into a sand mixer, heating to the required film coating temperature, adding modified phenolic resin, stirring for 2min, cooling, sequentially adding urotropine and a high-temperature resistant additive when the temperature is reduced to 82 ℃, stirring for 2min, sequentially adding magnesium stearate, zinc stearate, kieselguhr and sepiolite, stirring to a loose sand state, and sieving by a 40-mesh sieve to obtain the environment-friendly high-temperature resistant film coating sand.
Example 5
The environment-friendly high-temperature-resistant precoated sand comprises the following raw materials in parts by weight: 47 parts of natural silica sand, 23 parts of zircon sand, 13.5 parts of modified phenolic resin, 1.5 parts of urotropine, 3.5 parts of magnesium stearate, 2.2 parts of zinc stearate, 2.8 parts of diatomite, 2.1 parts of high-temperature resistant additive and 1.8 parts of sepiolite;
wherein the high-temperature resistant additive comprises graphite, aluminum hydroxide and antimony trioxide;
the weight ratio of the graphite to the aluminum hydroxide to the antimony trioxide is 1.5: 2: 0.6;
the preparation method of the modified phenolic resin comprises the following steps: mixing phenol, formaldehyde aqueous solution and oxalic acid, heating to 80 ℃, preserving heat for 2h, adding dialdehyde cellulose, continuing heating to 110 ℃, preserving heat for 2h, cooling, and dehydrating under negative pressure for 2h to obtain modified phenolic resin;
in the preparation of the modified phenolic resin, the concentration of the formaldehyde aqueous solution is 45 wt%;
in the preparation of the modified phenolic resin, the molar ratio of phenolic aldehyde is 1: 0.6;
in the preparation of the modified phenolic resin, the weight ratio of phenol, oxalic acid and dialdehyde cellulose is 1: 0.05: 0.4.
the preparation method of the environment-friendly high-temperature-resistant precoated sand comprises the following steps: weighing the raw materials according to the weight parts of the raw materials, sequentially adding natural silica sand and zircon sand into a sand mixer, heating to the required film coating temperature, adding modified phenolic resin, stirring for 3min, cooling, sequentially adding urotropine and a high-temperature resistant additive when the temperature is reduced to 87 ℃, stirring for 1min, sequentially adding magnesium stearate, zinc stearate, diatomite and sepiolite, stirring to a loose sand state, and sieving by a 60-mesh sieve to obtain the environment-friendly high-temperature resistant film coating sand.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The environment-friendly high-temperature-resistant precoated sand is characterized by comprising the following raw materials in parts by weight: 40-50 parts of natural silica sand, 20-35 parts of zircon sand, 12-14 parts of modified phenolic resin, 1-3 parts of urotropine, 2-4 parts of magnesium stearate, 2-3 parts of zinc stearate, 2-3 parts of diatomite, 2-3 parts of high temperature resistant additive and 1-2 parts of sepiolite;
the high-temperature resistant additive comprises graphite, aluminum hydroxide and antimony trioxide;
the preparation method of the modified phenolic resin comprises the following steps: mixing phenol, formaldehyde aqueous solution and oxalic acid, heating to 70-80 ℃, preserving heat for 2-3h, adding dialdehyde cellulose, continuing heating to 100-110 ℃, preserving heat for 2-3h, cooling, and dehydrating under negative pressure for 1-2h to obtain the modified phenolic resin.
2. The environment-friendly high-temperature-resistant precoated sand according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 42-47 parts of natural silica sand, 23-32 parts of zircon sand, 12.5-13.5 parts of modified phenolic resin, 1.5-2.5 parts of urotropine, 2.5-3.5 parts of magnesium stearate, 2.2-2.8 parts of zinc stearate, 2.2-2.8 parts of diatomite, 2.1-2.7 parts of high-temperature resistant additive and 1.2-1.8 parts of sepiolite.
3. The environment-friendly high-temperature-resistant precoated sand according to claim 1 or 2, wherein the weight ratio of the natural silica sand to the zircon sand is 45-46: 24-30.
4. The environment-friendly high-temperature-resistant precoated sand according to claim 1, wherein the weight ratio of the graphite to the aluminum hydroxide to the antimony trioxide is 1-2: 1-3: 0.5-0.7.
5. The environment-friendly high-temperature-resistant precoated sand according to claim 1, wherein the concentration of the formaldehyde aqueous solution in the preparation of the modified phenolic resin is 37-45 wt%.
6. The environment-friendly high-temperature-resistant precoated sand according to any one of claims 1 and 5, wherein in the preparation of the modified phenolic resin, the weight ratio of phenol to oxalic acid to dialdehyde cellulose is 1: 0.03-0.05: 0.4-0.5.
7. The preparation method of the environment-friendly high-temperature-resistant precoated sand according to any one of claims 1 to 6, characterized by comprising the following steps: weighing the raw materials according to the weight parts of the raw materials, sequentially adding natural silica sand and zircon sand into a sand mixer, heating, adding modified phenolic resin, stirring for 2-3min, cooling, sequentially adding urotropine and a high-temperature resistant additive when the temperature is reduced to 80-90 ℃, stirring for 1-2min, sequentially adding magnesium stearate, zinc stearate, diatomite and sepiolite, stirring to be in a loose sand state, and sieving by a 40-60-mesh sieve to obtain the environment-friendly high-temperature resistant precoated sand.
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Families Citing this family (5)
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| CN108746476A (en) * | 2018-05-15 | 2018-11-06 | 王召惠 | A kind of preparation method of modification phenolic resin-based precoated sand |
| CN109746383A (en) * | 2019-03-22 | 2019-05-14 | 十堰长江造型材料有限公司 | A kind of steel-casting precoated sand process for making shell |
| CN110732631B (en) * | 2019-11-28 | 2021-04-30 | 山东永创材料科技有限公司 | Binder for casting material and preparation process thereof |
| CN112517835A (en) * | 2020-12-11 | 2021-03-19 | 南通美莱达科技有限公司 | Novel high-temperature-resistant cast steel precoated sand and preparation process thereof |
| CN117181990B (en) * | 2023-10-07 | 2024-03-19 | 胜利油田金岛实业有限责任公司 | High-temperature-resistant precoated sand and preparation method thereof |
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