CN103586401A - Precoated sand - Google Patents
Precoated sand Download PDFInfo
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- CN103586401A CN103586401A CN201310609139.1A CN201310609139A CN103586401A CN 103586401 A CN103586401 A CN 103586401A CN 201310609139 A CN201310609139 A CN 201310609139A CN 103586401 A CN103586401 A CN 103586401A
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Abstract
The invention relates to precoated sand. The precoated sand comprises crude sand,an adhesive, an curing agent, a lubricating agent and a coupling agent, wherein the adhesive is 2-3% of the crude sand by mass; the curing agent is 12-16% of the adhesive by mass; the ubricating agent is 1-3% of the adhesive by mass; the coupling agent is 0.5-1.5% of the adhesive by mass; and the granularity of the crude sand is 70-140 meshes. The precoated sand of the invention has the advantages of high heat intensity, better fluidity and collapsibility, good breathability and easy tightening, and can meet the requirements of the surface quality and mechanical property of castings.
Description
Technical field
The present invention relates to casting field, relate in particular to a kind of precoated sand.
Background technology
Precoated sand refers to front molding sand or the core sand that covers one deck hard resin film at sand grain surface of moulding, have two kinds of coating techniques of cold process and Re Fa: cold process with ethanol by resin dissolves, and add methenamine in mulling process, make the two be coated on sand grain surface, the ethanol precoated sand that volatilizees to obtain; Hot method is preheating to uniform temperature sand, adds resin it is dissolved, and stirs and makes resin-coating at sand grain surface, adds the methenamine aqueous solution and lubricant, cooling, broken, sieve to obtain precoated sand.
The formed precision of precoated sand foundry goods and mechanical property are mainly controlled by precoated sand properties of materials and casting process, and in precoated sand, the content of the main component of roughing sand and refractoriness and resin all can have influence on the surface quality of foundry goods and dimensional accuracy etc.; In addition, prepare roughing sand while adding resin in precoated sand process temperature, add mixed grind time after resin, the temperature while adding curing agent, add the mixed grind time after curing agent all can affect calorific intensity and the mobility of precoated sand, thereby affect the performance of foundry goods.
Summary of the invention
The present invention has overcome the deficiencies in the prior art, provides a kind of calorific intensity high, and mobility, collapsibility are better, are difficult for the precoated sand in scab.
For achieving the above object, the technical solution used in the present invention is: a kind of precoated sand, comprise roughing sand, binding agent, curing agent, lubricant and coupling agent, it is characterized in that: described binding agent accounts for 2%～3% of described roughing sand quality, described curing agent accounts for 12%～16% of described binding agent quality, described lubricant accounts for 1%～3% of described binding agent quality, and described coupling agent accounts for 0.5%～1.5% of described binding agent quality; The granularity of described roughing sand is 70～140 orders.
Preferably, described binding agent accounts for 2.5% of described roughing sand quality, and described curing agent accounts for 14% of described binding agent quality, and described lubricant accounts for 2% of described binding agent quality, and described coupling agent accounts for 1% of described binding agent quality; The granularity of described roughing sand is 90 orders.
Preferably, Al2O3 mass content >=75% in described roughing sand, Fe2O3≤5%, TiO2≤5%.
Preferably, described binding agent is solid thermoplastics phenolic resins.
Preferably, described curing agent is Powdered methenamine.
Preferably, described lubricant is Powdered calcium stearate.
Preferably, described coupling agent is silane coupling agent.
A preparation method for precoated sand, is characterized in that comprising the following steps:
The first step, the precoated sand of configuration as described in claim 1～7 any one;
Second step, roughing sand is heated in puddle mixer to 220～230 ℃, after mixed grind 80s, when temperature is down to 110～130 ℃, add broken binding agent, after mixed grind 60～100s, add that to be configured to concentration be 75% coupling agent solution, mixed grind 20～30s, add again 50% lubricant, while cooling the temperature to 90～100 ℃, add that to be configured to concentration be 98% curing agent solution, mixed grind 40～80s, add remaining lubricant, mixed grind 50s, finally passes into cooling water and is cooled to room temperature, and broken and screening is processed.
When preferably, temperature is down to 120 ℃ after roughing sand heating mixed grind in described second step, add broken binding agent, mixed grind 80s.
Preferably, while cooling the temperature to 95 ℃ in described second step, add that to be configured to concentration be 98% curing agent solution, mixed grind 60s.
The invention solves the defect existing in background technology, precoated sand calorific intensity of the present invention is high, and mobility, collapsibility are better, and good permeability, is easy to consolidation, can meet surface quality and the mechanical property of foundry goods.
The specific embodiment
The present invention is further detailed explanation in conjunction with the embodiments now.
A kind of precoated sand, comprise roughing sand, binding agent, curing agent, lubricant and coupling agent, described binding agent accounts for 2%～3% of described roughing sand quality, described curing agent accounts for 12%～16% of described binding agent quality, described lubricant accounts for 1%～3% of described binding agent quality, and described coupling agent accounts for 0.5%～1.5% of described binding agent quality; The granularity of described roughing sand is 70～140 orders.
Preferably, described binding agent accounts for 2.5% of described roughing sand quality, and described curing agent accounts for 14% of described binding agent quality, and described lubricant accounts for 2% of described binding agent quality, and described coupling agent accounts for 1% of described binding agent quality; The granularity of described roughing sand is 90 orders.
Al2O3 mass content >=75% in the present invention in roughing sand, Fe2O3≤5%, TiO2≤5%; Adopting solid thermoplastics phenolic resins is binding agent, and Powdered methenamine is curing agent, and Powdered calcium stearate is lubricant, silane coupling agent.Roughing sand particle shape in the present invention is round, is conducive to resin and flows to the contact point between sand grains, forms thicker resin necking down, has improved adhesion strength, can improve the uniformity of resin molding and the degree of packing of sand mold simultaneously; Increase along with resin content in roughing sand, the resin molding of sand grain surface thickens, the gas forming amount of foundry goods increases, therefore,, under same intensity, resin amount is more few better, in the present invention, resin content accounts for 2.5% of roughing sand quality, the good fluidity of melt, can improve the intensity of precoated sand, improves its collapsibility.
The precoated sand that the present invention utilizes above-mentioned formula and proportioning to be made into, smooth surface, mobility and good permeability, be easy to consolidation, has good thermal conductivity, and thermal expansion amount is little, refractoriness >=1800 ℃, and be easy to sand removal.
A preparation method for precoated sand, comprises the following steps:
The first step, configures above-mentioned precoated sand;
Second step, roughing sand is heated in puddle mixer to 220～230 ℃, after mixed grind 80s, when temperature is down to 110～130 ℃, add broken binding agent, after mixed grind 60～100s, add that to be configured to concentration be 75% coupling agent solution, mixed grind 20～30s, add again 50% lubricant, while cooling the temperature to 90～100 ℃, add that to be configured to concentration be 98% curing agent solution, mixed grind 40～80s, add remaining lubricant, mixed grind 50s, finally passes into cooling water and is cooled to room temperature, and broken and screening is processed.
When preferably, temperature is down to 120 ℃ after roughing sand heating mixed grind in second step, add broken binding agent, mixed grind 80s; While cooling the temperature to 95 ℃, add that to be configured to concentration be 98% curing agent solution, mixed grind 60s.When resin is joined in roughing sand, the heat effect of roughing sand makes resin heat up, soften and is progressively coated sand grains, if temperature is too low, resin can not melt completely, intensity and hot toughness are lower, if excess Temperature affects its mobility and overlay film effect, while being chosen in 120 ℃, add resin, can guarantee intensity, mobility and the overlay film effect of precoated sand; Resin is after reaching softening temperature, start to carry out overlay film, resin viscosity constantly increases, increase along with the mixed grind time, the compound of sand grains and resin starts cooling, due to its viscosity decline of scattering and disappearing of heat, mixed grind 80s can guarantee that resin is coated on uniformly sand grain surface and forms resin molding, is unlikely to be again bonded to agglomerate.In the overlay film process of resin, the coupling agent adding has been strengthened the boundary strength between roughing sand and resin, promoted its interface combination, calcium stearate improves the mobility of precoated sand, reduces caking and gas forming amount, improve the calorific intensity of precoated sand, when mixture temperature drops to 95 ℃, add aqueous solution of curing agent, be beneficial to curing reaction and fully effectively carry out, accelerate curing rate, improved adhesion strength and efficiency; Evaporation due to moisture in curing agent, the hurried decline of mixture temperature and be bonded to solid mass, under the percussion of puddle mixer rapid stirring, agglomerate is progressively smashed dispersion, form finished product precoated sand loose, surperficial resin-coated film, now, if the mixed grind time, too short curing reaction was incomplete, overlong time, the crosslinked meeting of roughing sand and resin is by heavy damage.
Embodiment 1:
A kind of precoated sand, comprise roughing sand, binding agent, curing agent, lubricant and coupling agent, described binding agent accounts for 2% of described roughing sand quality, and described curing agent accounts for 12% of described binding agent quality, described lubricant accounts for 1% of described binding agent quality, and described coupling agent accounts for 0.5% of described binding agent quality; The granularity of described roughing sand is 70 orders.Al2O3 mass content >=75% in roughing sand, Fe2O3≤5%, TiO2≤5%; Adopting solid thermoplastics phenolic resins is binding agent, and Powdered methenamine is curing agent, and Powdered calcium stearate is lubricant, silane coupling agent.
A preparation method for precoated sand, comprises the following steps:
The first step, configures above-mentioned precoated sand;
Second step is heated to roughing sand 220 ℃, after mixed grind 80s in puddle mixer, when temperature is down to 110 ℃, add broken binding agent, after mixed grind 60s, add that to be configured to concentration be 75% coupling agent solution, mixed grind 20s, then add 50% lubricant, while cooling the temperature to 90 ℃, add that to be configured to concentration be 98% curing agent solution, mixed grind 40s, add remaining lubricant, mixed grind 50s, finally passes into cooling water and is cooled to room temperature, and broken and screening is processed.
Embodiment 2:
A kind of precoated sand, comprise roughing sand, binding agent, curing agent, lubricant and coupling agent, described binding agent accounts for 3% of described roughing sand quality, and described curing agent accounts for 16% of described binding agent quality, described lubricant accounts for 3% of described binding agent quality, and described coupling agent accounts for 1.5% of described binding agent quality; The granularity of described roughing sand is 140 orders.Al2O3 mass content >=75% in roughing sand, Fe2O3≤5%, TiO2≤5%; Adopting solid thermoplastics phenolic resins is binding agent, and Powdered methenamine is curing agent, and Powdered calcium stearate is lubricant, silane coupling agent.
A preparation method for precoated sand, comprises the following steps:
The first step, configures above-mentioned precoated sand;
Second step is heated to roughing sand 230 ℃, after mixed grind 80s in puddle mixer, when temperature is down to 130 ℃, add broken binding agent, after mixed grind 100s, add that to be configured to concentration be 75% coupling agent solution, mixed grind 30s, then add 50% lubricant, while cooling the temperature to 100 ℃, add that to be configured to concentration be 98% curing agent solution, mixed grind 80s, add remaining lubricant, mixed grind 50s, finally passes into cooling water and is cooled to room temperature, and broken and screening is processed.
Embodiment 3:
A kind of precoated sand, comprise roughing sand, binding agent, curing agent, lubricant and coupling agent, described binding agent accounts for 2.5% of described roughing sand quality, and described curing agent accounts for 14% of described binding agent quality, described lubricant accounts for 2% of described binding agent quality, and described coupling agent accounts for 1% of described binding agent quality; The granularity of described roughing sand is 90 orders.Al2O3 mass content >=75% in roughing sand, Fe2O3≤5%, TiO2≤5%; Adopting solid thermoplastics phenolic resins is binding agent, and Powdered methenamine is curing agent, and Powdered calcium stearate is lubricant, silane coupling agent.
A preparation method for precoated sand, comprises the following steps:
The first step, configures above-mentioned precoated sand;
Second step is heated to roughing sand 225 ℃, after mixed grind 80s in puddle mixer, when temperature is down to 120 ℃, add broken binding agent, after mixed grind 80s, add that to be configured to concentration be 75% coupling agent solution, mixed grind 25s, then add 50% lubricant, while cooling the temperature to 95 ℃, add that to be configured to concentration be 98% curing agent solution, mixed grind 60s, add remaining lubricant, mixed grind 50s, finally passes into cooling water and is cooled to room temperature, and broken and screening is processed.
Above foundation desirable embodiment of the present invention is enlightenment, and by above-mentioned description, related personnel can, within not departing from the scope of this invention technological thought, carry out various change and modification completely.The technical scope of this invention is not limited to the content on description, must determine technical scope according to claim scope.
Claims (10)
1. a precoated sand, comprise roughing sand, binding agent, curing agent, lubricant and coupling agent, it is characterized in that: described binding agent accounts for 2%～3% of described roughing sand quality, described curing agent accounts for 12%～16% of described binding agent quality, described lubricant accounts for 1%～3% of described binding agent quality, and described coupling agent accounts for 0.5%～1.5% of described binding agent quality; The granularity of described roughing sand is 70～140 orders.
2. a kind of precoated sand according to claim 1, it is characterized in that: described binding agent accounts for 2.5% of described roughing sand quality, described curing agent accounts for 14% of described binding agent quality, and described lubricant accounts for 2% of described binding agent quality, and described coupling agent accounts for 1% of described binding agent quality; The granularity of described roughing sand is 90 orders.
3. a kind of precoated sand according to claim 1 and 2, is characterized in that: Al2O3 mass content >=75% in described roughing sand, Fe2O3≤5%, TiO2≤5%.
4. a kind of precoated sand according to claim 1 and 2, is characterized in that: described binding agent is solid thermoplastics phenolic resins.
5. a kind of precoated sand according to claim 1 and 2, is characterized in that: described curing agent is Powdered methenamine.
6. a kind of precoated sand according to claim 1 and 2, is characterized in that: described lubricant is Powdered calcium stearate.
7. a kind of precoated sand according to claim 1 and 2, is characterized in that: described coupling agent is silane coupling agent.
8. a preparation method for precoated sand, is characterized in that comprising the following steps:
The first step, the precoated sand of configuration as described in claim 1～7 any one;
Second step, roughing sand is heated in puddle mixer to 220～230 ℃, after mixed grind 80s, when temperature is down to 110～130 ℃, add broken binding agent, after mixed grind 60～100s, add that to be configured to concentration be 75% coupling agent solution, mixed grind 20～30s, add again 50% lubricant, while cooling the temperature to 90～100 ℃, add that to be configured to concentration be 98% curing agent solution, mixed grind 40～80s, add remaining lubricant, mixed grind 50s, finally passes into cooling water and is cooled to room temperature, and broken and screening is processed.
9. the preparation method of a kind of precoated sand according to claim 8, is characterized in that: when temperature is down to 120 ℃ after roughing sand heating mixed grind in described second step, add broken binding agent, mixed grind 80s.
10. the preparation method of a kind of precoated sand according to claim 8, is characterized in that: while cooling the temperature to 95 ℃ in described second step, add that to be configured to concentration be 98% curing agent solution, mixed grind 60s.
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| CN201310609139.1A CN103586401A (en) | 2013-11-27 | 2013-11-27 | Precoated sand |
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| CN201310609139.1A CN103586401A (en) | 2013-11-27 | 2013-11-27 | Precoated sand |
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Cited By (22)
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| CN104209450A (en) * | 2014-09-04 | 2014-12-17 | 河南省西峡汽车水泵股份有限公司 | Special precoated sand for cast of high alloy material |
| CN104325065A (en) * | 2014-10-08 | 2015-02-04 | 吴江市液铸液压件铸造有限公司 | Coated sand 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 |
| CN104889313A (en) * | 2015-04-24 | 2015-09-09 | 北京仁创科技集团有限公司 | Coated sand preparation method |
| CN105215260A (en) * | 2015-09-21 | 2016-01-06 | 济南大学 | A kind of for the low precoated sand preparation method that gets angry of laser sintered 3D printing |
| CN105537503A (en) * | 2016-02-29 | 2016-05-04 | 无锡烨隆精密机械有限公司 | Sand burning preventive precoated sand for casting of turbine casing |
| CN105945206A (en) * | 2016-05-23 | 2016-09-21 | 无锡市嘉邦电力管道厂 | High-temperature resistant precoated sand |
| CN106077425A (en) * | 2016-07-29 | 2016-11-09 | 无锡市三峰仪器设备有限公司 | The most defeated and dispersed a kind of instrument Foundry Coated Sand |
| CN106493285A (en) * | 2016-10-28 | 2017-03-15 | 东南大学 | A kind of method for improving precoated sand performance |
| CN107327836A (en) * | 2017-06-28 | 2017-11-07 | 上海炳晟机电科技有限公司 | A kind of water conservancy diversion alloy sheets of process precoated sand processing |
| CN107745068A (en) * | 2017-11-05 | 2018-03-02 | 中北大学 | A kind of laser 3D printing precoated sand and preparation method thereof |
| CN107913975A (en) * | 2017-12-19 | 2018-04-17 | 湖南镭目科技有限公司 | A kind of precoated sand |
| CN108296420A (en) * | 2017-10-27 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of 3D printing precoated sand and preparation method thereof |
| CN108296425A (en) * | 2017-10-27 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of preparation method of 3D printing precoated sand and 3D printing precoated sand obtained |
| CN108296442A (en) * | 2017-10-27 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of 3D printing precoated sand moulding process |
| CN108971418A (en) * | 2018-07-04 | 2018-12-11 | 天津致勤新型材料有限公司 | A kind of overlay film sand additive for preventing sand core from shelling, anti-shelling precoated sand and preparation method thereof |
| CN109277519A (en) * | 2018-10-09 | 2019-01-29 | 安徽大天铸业有限责任公司 | A kind of precoated sand and preparation method thereof reducing scab amount |
| 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 |
| CN110102703A (en) * | 2019-05-07 | 2019-08-09 | 秦声旺 | A kind of novel environment friendly smoke-free and tasteless precoated sand and preparation method thereof |
| CN111604474A (en) * | 2020-07-09 | 2020-09-01 | 四川清贝科技技术开发有限公司 | Preparation process of wear-resistant pressure-resistant bent pipe |
| CN111659848A (en) * | 2020-06-17 | 2020-09-15 | 丹阳市丹水铸造新材有限公司 | Preparation method of environment-friendly precoated sand |
| CN112355231A (en) * | 2020-11-11 | 2021-02-12 | 南阳仁创再生资源有限公司 | Water glass precoated sand for casting and preparation method thereof |
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| CN104209450B (en) * | 2014-09-04 | 2016-06-15 | 西峡县西泵特种铸造有限公司 | A kind of extraordinary precoated sand of high alloy material foundry goods |
| CN104209450A (en) * | 2014-09-04 | 2014-12-17 | 河南省西峡汽车水泵股份有限公司 | Special precoated sand for cast of high alloy material |
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| CN104889313B (en) * | 2015-04-24 | 2019-01-18 | 北京仁创科技集团有限公司 | A kind of precoated sand preparation method |
| CN104889313A (en) * | 2015-04-24 | 2015-09-09 | 北京仁创科技集团有限公司 | Coated sand preparation method |
| CN105215260A (en) * | 2015-09-21 | 2016-01-06 | 济南大学 | A kind of for the low precoated sand preparation method that gets angry of laser sintered 3D printing |
| CN105537503A (en) * | 2016-02-29 | 2016-05-04 | 无锡烨隆精密机械有限公司 | Sand burning preventive precoated sand for casting of turbine casing |
| CN105945206A (en) * | 2016-05-23 | 2016-09-21 | 无锡市嘉邦电力管道厂 | High-temperature resistant precoated sand |
| CN105945206B (en) * | 2016-05-23 | 2019-01-22 | 无锡市嘉邦电力管道厂 | A kind of precoated sand resistant to high temperature |
| CN106077425A (en) * | 2016-07-29 | 2016-11-09 | 无锡市三峰仪器设备有限公司 | The most defeated and dispersed a kind of instrument Foundry Coated Sand |
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| CN108296420A (en) * | 2017-10-27 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of 3D printing precoated sand and preparation method thereof |
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| CN107745068A (en) * | 2017-11-05 | 2018-03-02 | 中北大学 | A kind of laser 3D printing precoated sand and preparation method thereof |
| CN107913975A (en) * | 2017-12-19 | 2018-04-17 | 湖南镭目科技有限公司 | A kind of precoated sand |
| CN108971418A (en) * | 2018-07-04 | 2018-12-11 | 天津致勤新型材料有限公司 | A kind of overlay film sand additive for preventing sand core from shelling, anti-shelling precoated sand and preparation method thereof |
| CN109277519A (en) * | 2018-10-09 | 2019-01-29 | 安徽大天铸业有限责任公司 | A kind of precoated sand and preparation method thereof reducing scab amount |
| 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 |
| CN110102703A (en) * | 2019-05-07 | 2019-08-09 | 秦声旺 | A kind of novel environment friendly smoke-free and tasteless precoated sand and preparation method thereof |
| CN111659848A (en) * | 2020-06-17 | 2020-09-15 | 丹阳市丹水铸造新材有限公司 | Preparation method of environment-friendly precoated sand |
| CN111604474A (en) * | 2020-07-09 | 2020-09-01 | 四川清贝科技技术开发有限公司 | Preparation process of wear-resistant pressure-resistant bent pipe |
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Application publication date: 20140219 |