CN104084518A - Heatproof precoated sand and preparation method thereof - Google Patents
Heatproof precoated sand and preparation method thereof Download PDFInfo
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- CN104084518A CN104084518A CN201410261187.0A CN201410261187A CN104084518A CN 104084518 A CN104084518 A CN 104084518A CN 201410261187 A CN201410261187 A CN 201410261187A CN 104084518 A CN104084518 A CN 104084518A
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- precoated sand
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Abstract
The invention discloses heatproof precoated sand and a preparation method thereof. The heatproof precoated sand is composed of modified phenolic resin, magnesium stearate, urotropine, bentonite, silicon carbide, silicon oil and silica sand. The preparation method is as follows: preparing an urotropine water solution, heating the silica sand to 120 to 140 DEG C under the condition of stirring, adding the modified phenolic resin, bentonite, silicon carbide and silicon oil, stirring for 30 60min, stopping heating, while adding the magnesium stearate and the urotropine water solution, mixing evenly, after cooling to room temperature, crushing and sieving to obtain the heatproof precoated sand. The heatproof precoated sand is reasonable in formula, heat resistance and wear resistance of the heatproof precoated sand are improved, the mobility of the heatproof precoated sand is increased, the heatproof precoated sand is low in cost, and simple in preparation method, the magnesium stearate and the silicon oil are added separately for mixing, so that the mobility of the heatproof precoated sand is ensured.
Description
Technical field
The present invention relates to a kind of heat-resisting precoated sand and preparation method thereof, belong to foundary industry technical field.
Background technology
Precoated sand refers to front molding sand or the core sand that is covered with one deck hard resin on sand grain surface of moulding, because it has, intensity is high, gas forming amount is low, production casting dimension accuracy is high, be convenient to the advantages such as preservation, applies in recent years increasingly extensive in the casting fields such as steel-casting, ironcasting.
Application number is that 201310068698.6 < < heat-resistance stainless steel foundry goods disclose a kind of formula of precoated sand with precoated sand > >, comprises 80～85 parts of roughing sand, 1.5～2.5 parts of phenolic resins, 15～20 parts of mound sand, 12～16 parts of lubricants, 4～6 parts of dispersants and methenamine.Although this invention intensity is high, high temperature resistant, its poor fluidity, easily scab on foundry goods.
Summary of the invention
The object of the present invention is to provide a kind of heat-resisting precoated sand and preparation method thereof.
The present invention is achieved through the following technical solutions:
A heat-resisting precoated sand, the percentage by weight of each raw material is respectively: phenol-formaldehyde resin modified 4-8%, dolomol 1-2%, methenamine 1-2%, bentonite 3-4%, carborundum 1-2%, silicone oil 3-5%, surplus is silica sand; Described phenol-formaldehyde resin modified obtains by following steps: the formalin that formaldehyde is mixed with to 10-20%, with NaOH, regulating PH is 9-10, adds two chromium borides, under 40-60 ℃ of condition, reacts 4-5h, finally add phenol, under 90-110 ℃ of condition, react 3-5h.
Wherein, the weight ratio of described phenol-formaldehyde resin modified and methenamine is 4:1.
Described a kind of heat-resisting precoated sand, in silica sand, the content of silica is greater than 95%.
Described a kind of heat-resisting precoated sand, the granularity of silica sand is 150 orders.
Described a kind of heat-resisting precoated sand, the percentage by weight of each raw material is respectively: phenol-formaldehyde resin modified 6%, dolomol 1%, methenamine 1.5%, bentonite 4%, carborundum 1.5, silicone oil 4% and silica sand 82%.
The preparation method of described a kind of heat-resisting precoated sand, methenamine is mixed with to 30% the methenamine aqueous solution, under stirring, silica sand is heated to 120-140 ℃, add phenol-formaldehyde resin modified, bentonite, carborundum and silicone oil, stir after 30-60min, stop heating, the methenamine aqueous solution that simultaneously adds dolomol and 30%, after mixing, to be cooled to room temperature, broken, screening can obtain heat-resisting precoated sand.
The beneficial effect that the present invention reaches:
The present invention fills a prescription rationally, has added phenol-formaldehyde resin modified and carborundum, has improved heat resistance and the wearability of precoated sand, and dolomol and silicone oil have increased the mobility of precoated sand; Cost of the present invention is lower, and preparation method is simple, and dolomol and silicone oil separately add and stir, and has guaranteed the mobility of precoated sand.After testing, precoated sand normal temperature bending strength of the present invention is 7-8MPa, and burning decrement is 1.5-2.5%, and hot bending strength is 2-4MPa.
The specific embodiment
Below in conjunction with embodiment, the invention will be further described.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
Embodiment 1
In the present embodiment, a kind of heat-resisting precoated sand, the percentage by weight of each raw material is respectively: the percentage by weight of each raw material is respectively: phenol-formaldehyde resin modified 6%, dolomol 1%, methenamine 1.5%, bentonite 4%, carborundum 1.5, silicone oil 4% and silica sand 82%; Described phenol-formaldehyde resin modified obtains by following steps: formaldehyde is mixed with to 20% formalin, with NaOH, regulating PH is 10, adds two chromium borides, under 60 ℃ of conditions, reacts 4h, finally adds phenol, under 110 ℃ of conditions, reacts 3h.
Wherein, in silica sand, the content of silica is 98%, and the granularity of silica sand is 150 orders.
The preparation method of described a kind of heat-resisting precoated sand, methenamine is mixed with to 30% the methenamine aqueous solution, under stirring, silica sand is heated to 120 ℃, add phenol-formaldehyde resin modified, bentonite, carborundum and silicone oil, stir after 60min, stop heating, the methenamine aqueous solution that simultaneously adds dolomol and 30%, after mixing, to be cooled to room temperature, broken, screening can obtain heat-resisting precoated sand.
Embodiment 2
In the present embodiment, a kind of heat-resisting precoated sand, the percentage by weight of each raw material is respectively: phenol-formaldehyde resin modified 4%, dolomol 2%, methenamine 1%, bentonite 3%, carborundum 2%, silicone oil 3% and silica sand 85%; Described phenol-formaldehyde resin modified obtains by following steps: formaldehyde is mixed with to 10% formalin, with NaOH, regulating PH is 9, adds two chromium borides, under 40 ℃ of conditions, reacts 5h, finally adds phenol, under 90 ℃ of conditions, reacts 5h.
Described a kind of heat-resisting precoated sand, in silica sand, the content of silica is 97%, the granularity of silica sand is 150 orders.
The preparation method of described a kind of heat-resisting precoated sand, methenamine is mixed with to 30% the methenamine aqueous solution, under stirring, silica sand is heated to 140 ℃, add phenol-formaldehyde resin modified, bentonite, carborundum and silicone oil, stir after 30min, stop heating, the methenamine aqueous solution that simultaneously adds dolomol and 30%, after mixing, to be cooled to room temperature, broken, screening can obtain heat-resisting precoated sand.
Embodiment 3
In the present embodiment, a kind of heat-resisting precoated sand, the percentage by weight of each raw material is respectively: phenol-formaldehyde resin modified 8%, dolomol 1%, methenamine 2%, bentonite 4%, carborundum 1%, silicone oil 5% and silica sand 79%; Described phenol-formaldehyde resin modified obtains by following steps: formaldehyde is mixed with to 18% formalin, with NaOH, regulating PH is 10, adds two chromium borides, under 50 ℃ of conditions, reacts 5h, finally adds phenol, under 100 ℃ of conditions, reacts 5h.
Wherein, in silica sand, the content of silica is 95%, and the granularity of silica sand is 150 orders.
The preparation method of described a kind of heat-resisting precoated sand, methenamine is mixed with to 30% the methenamine aqueous solution, under stirring, silica sand is heated to 140 ℃, add phenol-formaldehyde resin modified, bentonite, carborundum and silicone oil, stir after 50min, stop heating, the methenamine aqueous solution that simultaneously adds dolomol and 30%, after mixing, to be cooled to room temperature, broken, screening can obtain heat-resisting precoated sand.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (6)
1. a heat-resisting precoated sand, is characterized in that, the percentage by weight of each raw material is respectively: phenol-formaldehyde resin modified 4-8%, dolomol 1-2%, methenamine 1-2%, bentonite 3-4%, carborundum 1-2%, silicone oil 3-5%, and surplus is silica sand; Described phenol-formaldehyde resin modified obtains by following steps: the formalin that formaldehyde is mixed with to 10-20%, with NaOH, regulating PH is 9-10, adds two chromium borides, under 40-60 ℃ of condition, reacts 4-5h, finally add phenol, under 90-110 ℃ of condition, react 3-5h.
2. a kind of heat-resisting precoated sand according to claim 1, is characterized in that, the weight ratio of described phenol-formaldehyde resin modified and methenamine is 4:1.
3. a kind of heat-resisting precoated sand according to claim 1, is characterized in that, in silica sand, the content of silica is greater than 95%.
4. according to a kind of heat-resisting precoated sand described in claim 1 or 3, it is characterized in that, the granularity of silica sand is 150 orders.
5. a kind of heat-resisting precoated sand according to claim 1, is characterized in that, the percentage by weight of each raw material is respectively: phenol-formaldehyde resin modified 6%, dolomol 1%, methenamine 1.5%, bentonite 4%, carborundum 1.5, silicone oil 4% and silica sand 82%.
6. the preparation method of a kind of heat-resisting precoated sand according to claim 1, it is characterized in that, methenamine is mixed with to 30% the methenamine aqueous solution, under stirring, silica sand is heated to 120-140 ℃, add phenol-formaldehyde resin modified, bentonite, carborundum and silicone oil, stir after 30-60min, stop heating, add the methenamine aqueous solution of dolomol and 30%, after mixing simultaneously, to be cooled to room temperature, broken, screening can obtain heat-resisting precoated sand.
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| CN201410261187.0A CN104084518B (en) | 2014-06-13 | 2014-06-13 | A kind of resistance to hot precoated sand and preparation method thereof |
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| CN201410261187.0A CN104084518B (en) | 2014-06-13 | 2014-06-13 | A kind of resistance to hot precoated sand and preparation method thereof |
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| CN104084518B CN104084518B (en) | 2015-12-02 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104646601A (en) * | 2015-01-22 | 2015-05-27 | 安徽省繁昌县皖南阀门铸造有限公司 | Molding sand for large mold core and preparation method thereof |
| CN104668439A (en) * | 2015-02-04 | 2015-06-03 | 繁昌县金科机电科技有限公司 | Easy-to-demould pre-coated sand with good mobility and preparation method thereof |
| CN105689634A (en) * | 2015-12-28 | 2016-06-22 | 合肥仁创铸造材料有限公司 | Sintering-resisting precoated sand |
| CN105903888A (en) * | 2016-05-26 | 2016-08-31 | 合肥市田源精铸有限公司 | High-temperature-resistant easily-collapsing precoated sand |
| CN107866518A (en) * | 2017-10-31 | 2018-04-03 | 安徽大天铸业有限责任公司 | A kind of environment friendly heat resistant precoated sand and preparation method thereof |
| CN107913978A (en) * | 2017-11-30 | 2018-04-17 | 宁波新天阳新材料科技有限公司 | A kind of speed constrictive type precoated sand |
| CN108296414A (en) * | 2017-09-27 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of high temperature resistant 3D printing precoated sand |
| CN109047644A (en) * | 2018-09-28 | 2018-12-21 | 佛山齐安建筑科技有限公司 | A kind of preparation method of high-performance precoated sand |
| CN109465383A (en) * | 2018-12-04 | 2019-03-15 | 合肥江淮铸造有限责任公司 | A kind of engine casting dedicated core sand of cylinder body |
| CN109530623A (en) * | 2018-12-04 | 2019-03-29 | 合肥江淮铸造有限责任公司 | A kind of preparation process of the anti-vein type sand core of water jacket of high intensity |
| CN110170614A (en) * | 2019-06-19 | 2019-08-27 | 浙江瓯赛汽车部件铸造有限公司 | A kind of resin-coated sand shell mould casting technique |
| CN110385395A (en) * | 2019-08-02 | 2019-10-29 | 中北大学 | A kind of selective laser sintering modified precoated sand and preparation method thereof |
| CN112548030A (en) * | 2019-09-24 | 2021-03-26 | 沈阳铸造研究所有限公司 | Surface treatment method of silica sand for casting sand core ink-jet 3D printing |
| CN115971405A (en) * | 2022-12-05 | 2023-04-18 | 常熟东南塑料有限公司 | Modified phenolic resin precoated sand and preparation method thereof |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104646601A (en) * | 2015-01-22 | 2015-05-27 | 安徽省繁昌县皖南阀门铸造有限公司 | Molding sand for large mold core and preparation method thereof |
| CN104668439A (en) * | 2015-02-04 | 2015-06-03 | 繁昌县金科机电科技有限公司 | Easy-to-demould pre-coated sand with good mobility and preparation method thereof |
| CN105689634A (en) * | 2015-12-28 | 2016-06-22 | 合肥仁创铸造材料有限公司 | Sintering-resisting precoated sand |
| CN105903888A (en) * | 2016-05-26 | 2016-08-31 | 合肥市田源精铸有限公司 | High-temperature-resistant easily-collapsing precoated sand |
| CN108296414A (en) * | 2017-09-27 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of high temperature resistant 3D printing precoated sand |
| CN107866518B (en) * | 2017-10-31 | 2020-02-14 | 安徽大天铸业有限责任公司 | Environment-friendly high-temperature-resistant precoated sand and preparation method thereof |
| CN107866518A (en) * | 2017-10-31 | 2018-04-03 | 安徽大天铸业有限责任公司 | A kind of environment friendly heat resistant precoated sand and preparation method thereof |
| CN107913978A (en) * | 2017-11-30 | 2018-04-17 | 宁波新天阳新材料科技有限公司 | A kind of speed constrictive type precoated sand |
| CN109047644A (en) * | 2018-09-28 | 2018-12-21 | 佛山齐安建筑科技有限公司 | A kind of preparation method of high-performance precoated sand |
| CN109465383A (en) * | 2018-12-04 | 2019-03-15 | 合肥江淮铸造有限责任公司 | A kind of engine casting dedicated core sand of cylinder body |
| CN109530623A (en) * | 2018-12-04 | 2019-03-29 | 合肥江淮铸造有限责任公司 | A kind of preparation process of the anti-vein type sand core of water jacket of high intensity |
| CN110170614A (en) * | 2019-06-19 | 2019-08-27 | 浙江瓯赛汽车部件铸造有限公司 | A kind of resin-coated sand shell mould casting technique |
| CN110170614B (en) * | 2019-06-19 | 2020-11-03 | 浙江瓯赛汽车部件铸造有限公司 | Precoated sand shell mold casting process |
| CN110385395A (en) * | 2019-08-02 | 2019-10-29 | 中北大学 | A kind of selective laser sintering modified precoated sand and preparation method thereof |
| CN110385395B (en) * | 2019-08-02 | 2021-01-08 | 中北大学 | Modified precoated sand for selective laser sintering and preparation method thereof |
| CN112548030A (en) * | 2019-09-24 | 2021-03-26 | 沈阳铸造研究所有限公司 | Surface treatment method of silica sand for casting sand core ink-jet 3D printing |
| CN115971405A (en) * | 2022-12-05 | 2023-04-18 | 常熟东南塑料有限公司 | Modified phenolic resin precoated sand and preparation method thereof |
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| CN104084518B (en) | 2015-12-02 |
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