CN103231008A - High temperature resistance precoated sand - Google Patents
High temperature resistance precoated sand Download PDFInfo
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- CN103231008A CN103231008A CN2013101315502A CN201310131550A CN103231008A CN 103231008 A CN103231008 A CN 103231008A CN 2013101315502 A CN2013101315502 A CN 2013101315502A CN 201310131550 A CN201310131550 A CN 201310131550A CN 103231008 A CN103231008 A CN 103231008A
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Abstract
The invention discloses high temperature resistance precoated sand, which comprises base sand, a binder, hexamethylenetetramine, a phenol formaldehyde resin, a silane coupling agent and an additive A, wherein the base sand comprises, by weight, 55-60 parts of iron ore sand, 60-70 parts of forsterite sand, and 7-10 parts of diatomite, a particle size of the base sand is 100-150 mesh, 3-5 parts by weight of boric acid, 1-2 parts by weight of water-soluble polymer glue powder, 3-5 parts by weight of starch, 0.5-0.8 part by weight of rosin, 4-5 parts by weight of dextrin and 4-6 parts by weight of water are subjected to a reaction and drying to obtain the binder, 4-6 parts by weight of a straw powder material, 2-4 parts by weight of sepiolite and 5-8 parts by weight of water are subjected to a mixing calcination treatment to obtain the additive A, a particle size of the straw powder material is 0.5-0.8 mm, and the obtained calcined product, 2-4 parts by weight of montmorillonite powder and 3-4 parts by weight of water glass are subjected to mixing granulation. The high temperature resistance precoated sand has the following characteristics that: moisture absorption resistance is good, roughness is low, high temperature resistance is provided, and sand sticking on a cast is not easily generated.
Description
Technical field
The present invention relates to a kind of casting model powder, relate in particular to a kind of heat resisting film-coating sand, specifically be applicable to the making of casting sand mold.
Background technology
Precoated sand refers to preceding molding sand or the core sand that is covered with one deck hard resin film at sand grain surface of moulding.Two kinds of coating techniques of cold process and Re Fa are arranged: cold process with resin dissolves, and adds methenamine with ethanol in the mulling process, make the two be coated on sand grain surface, and the ethanol volatilization gets precoated sand; Hot method is preheating to uniform temperature to sand, adds resin and makes its fusion, stirs to make resin-coating at sand grain surface, adds the methenamine aqueous solution and lubricant, cooling, broken, sieve precoated sand.Be used for steel-casting, ironcasting.Intensity height, gas forming amount are low because precoated sand has, production casting dimension accuracy height, any surface finish, be convenient to advantage such as preservation, use increasingly extensive in recent years.
Precoated sand of the prior art exists that hear resistance is relatively poor, roughness defective and problem big, easily scab on foundry goods.
Summary of the invention
The objective of the invention is to overcome that the hear resistance that exists in the prior art is relatively poor, roughness defective and problem big, easily scab on foundry goods, provide that a kind of resistance to water soak is better, high temperature resistant, roughness is less, be difficult for the precoated sand of scab on foundry goods.
For realizing above purpose, technical scheme of the present invention is:
Heat resisting film-coating sand, comprise roughing sand, binding agent, methenamine, phenolic resins, silane coupler and additive A, in weight portion, described roughing sand is mixed and is formed by 55-60 part flatiron ore in sand form, 60-70 part forsterite sand, 7-10 part diatomite, the granularity of described roughing sand is the 100-150 order, described bonding agent is to obtain by 3-5 part boric acid, 1-2 part water soluble polymer rubber powder, 3-5 part starch, 0.5-0.8 part rosin, 4-5 part dextrin being added 4-6 part water at 80-90 ℃ of following stirring reaction 1-2 hour, drying after the reaction; Described additive A is to forge processing by 4-6 part straw powder material, 2-4 part sepiolite, 5-8 part water are mixed to burn, the granularity of straw powder material is 0.5-0.8mm, burning is forged product and 2-4 part montmorillonite powder, 3-4 part waterglass mixing granulation, roasting 3-4 hour again, sintering temperature control obtains additive A at 350-400 ℃ after the pulverizing;
Its preparation method is as follows: earlier roughing sand is put in the blade mixer, after being heated to 130-150 ℃, in roughing sand, put into described bonding agent mixed grind time 40-50S again, when the roughing sand temperature is reduced to 90-110 ℃, add 12-15 part methenamine, add 5-8 part phenolic resins, 0.5-1.2 part silane coupler and additive A mixed grind 40-50S behind the mixed grind 10S, when treating that roughing sand is down to below 80 ℃, broken, screening obtains precoated sand.
Described roughing sand is made up of 58 parts of flatiron ores in sand form, 65 parts of forsterite sands, 8 parts of diatomite.
Its preparation method is as follows: earlier 130 parts of roughing sand are put in the blade mixer, after being heated to 130-150 ℃, in roughing sand, put into described 3-4 part bonding agent mixed grind time 40-50S again, when the roughing sand temperature is reduced to 90-110 ℃, add 12-15 part methenamine, add 5-8 part phenolic resins, 0.5-1.2 part silane coupler and 10-12 part additive A mixed grind 40-50S behind the mixed grind 10S, when treating that roughing sand is down to below 80 ℃, broken, screening obtains precoated sand.
Compared with prior art, beneficial effect of the present invention is:
1, because a kind of precoated sand of the present invention comprises roughing sand, binding agent, curing agent and coupling agent, the consumption of various components and additive A and the granularity of roughing sand are the 100-150 order, the granularity of roughing sand emphasizes to help to improve intensity and the hear resistance of precoated sand, and the emphasizing of hardener dose helps to reduce the roughness of the sand mold that precoated sand makes up.Therefore not only hear resistance is better in the present invention, and roughness is less.
2, constituent and the weight portion ratio thereof owing to the roughing sand in a kind of precoated sand of the present invention is: roughing sand is made up of 55-60 part emergy, 60-70 part bauxite sand, 10-20 part diatomite, not only can improve the hear resistance of roughing sand, can also strengthen its gas permeability, thereby improve hear resistance and the gas permeability of precoated sand, gas permeability is conducive to avoid scab on the foundry goods, and, the constituent of binding agent and the design of weight portion ratio thereof are conducive to raw-material even configuration in the precoated sand, also are conducive to avoid scab on the foundry goods.Therefore gas permeability of the present invention is better, can avoid scab on foundry goods.
3, this precoated sand also has the raising rate of delaying 3-5S except the performance with conventional precoated sand, suppresses the performance of nitrogen gas generation, can effectively reduce foundry goods and produce nitrogen pore, improves the yield rate of iron castings greatly.
The specific embodiment
Heat resisting film-coating sand, comprise roughing sand, binding agent, methenamine, phenolic resins, silane coupler and additive A, in weight portion, described roughing sand is mixed and is formed by 58 parts of flatiron ores in sand form, 65 parts of forsterite sands, 8 parts of diatomite, the granularity of described roughing sand is the 100-150 order, described bonding agent is to obtain by 3-5 part boric acid, 1-2 part water soluble polymer rubber powder, 3-5 part starch, 0.5-0.8 part rosin, 4-5 part dextrin being added 4-6 part water at 80-90 ℃ of following stirring reaction 1-2 hour, drying after the reaction; Described additive A is to forge processing by 4-6 part straw powder material, 2-4 part sepiolite, 5-8 part water are mixed to burn, the granularity of straw powder material is 0.5-0.8mm, burning is forged product and 2-4 part montmorillonite powder, 3-4 part waterglass mixing granulation, roasting 3-4 hour again, sintering temperature control obtains additive A at 350-400 ℃ after the pulverizing;
Its preparation method is as follows: earlier 130 parts of roughing sand are put in the blade mixer, after being heated to 130-150 ℃, in roughing sand, put into described 3 parts of bonding agent mixed grind time 40-50S again, when the roughing sand temperature is reduced to 90-110 ℃, add 12 parts of methenamines, add 8 parts of phenolic resins, 1.2 parts of silane couplers and 10 parts of additive A mixed grind 40-50S behind the mixed grind 10S, when treating that roughing sand is down to below 80 ℃, broken, screening obtains precoated sand.
Prepare the precoated sand standard specimen as stated above, its every performance tested test result such as following table:
| Normal temperature bending strength (MPa) | 9.9 |
| Hot bending strength (MPa) | 2.15 |
| Fusing point (℃) | 94 |
| Burning decrement (mass fraction) (%) | 0.15 |
Claims (3)
1. heat resisting film-coating sand, comprise roughing sand, binding agent, methenamine, phenolic resins, silane coupler and additive A, in weight portion, it is characterized in that: described roughing sand is mixed and is formed by 55-60 part flatiron ore in sand form, 60-70 part forsterite sand, 7-10 part diatomite, the granularity of described roughing sand is the 100-150 order, described bonding agent is to obtain by 3-5 part boric acid, 1-2 part water soluble polymer rubber powder, 3-5 part starch, 0.5-0.8 part rosin, 4-5 part dextrin being added 4-6 part water at 80-90 ℃ of following stirring reaction 1-2 hour, drying after the reaction; Described additive A is to forge processing by 4-6 part straw powder material, 2-4 part sepiolite, 5-8 part water are mixed to burn, the granularity of straw powder material is 0.5-0.8mm, burning is forged product and 2-4 part montmorillonite powder, 3-4 part waterglass mixing granulation, roasting 3-4 hour again, sintering temperature control obtains additive A at 350-400 ℃ after the pulverizing;
Its preparation method is as follows: earlier 130 parts of roughing sand are put in the blade mixer, after being heated to 130-150 ℃, in roughing sand, put into described 3-4 part bonding agent mixed grind time 40-50S again, when the roughing sand temperature is reduced to 90-110 ℃, add 12-15 part methenamine, add 5-8 part phenolic resins, 0.5-1.2 part silane coupler and 10-12 part additive A mixed grind 40-50S behind the mixed grind 10S, when treating that roughing sand is down to below 80 ℃, broken, screening obtains precoated sand.
2. heat resisting film-coating sand according to claim 1, it is characterized in that: described roughing sand is made up of 58 parts of flatiron ores in sand form, 65 parts of forsterite sands, 8 parts of diatomite.
3. heat resisting film-coating sand according to claim 1, it is characterized in that: described preparation method is as follows: earlier roughing sand is put in the blade mixer, after being heated to 140 ℃, in roughing sand, put into described bonding agent mixed grind time 45S again, when the roughing sand temperature is reduced to 100 ℃, add 14 parts of methenamines, add 6 parts of phenolic resins, additive A mixed grind 45S behind the mixed grind 10S, when treating that roughing sand is down to below 80 ℃, broken, screening obtains precoated sand.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101315502A CN103231008A (en) | 2013-04-16 | 2013-04-16 | High temperature resistance precoated sand |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101315502A CN103231008A (en) | 2013-04-16 | 2013-04-16 | High temperature resistance precoated sand |
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| CN103231008A true CN103231008A (en) | 2013-08-07 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521685A (en) * | 2013-10-16 | 2014-01-22 | 合肥市田源精铸有限公司 | Modified sand of nano sepiolite, and preparation method thereof |
| CN103567368A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Molding sand with high wet-heat tensile strength and preparation method thereof |
| CN103567367A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Anti-sticking molding sand for casting and preparation method thereof |
| CN104084518A (en) * | 2014-06-13 | 2014-10-08 | 吴江市液铸液压件铸造有限公司 | Heatproof precoated sand and preparation method thereof |
| CN104162624A (en) * | 2014-07-22 | 2014-11-26 | 浙江太阳股份有限公司 | Special glue for shell type bonding and preparation process thereof |
| CN104226888A (en) * | 2014-08-29 | 2014-12-24 | 吴江市液铸液压件铸造有限公司 | Easily-scattered precoated sand and preparation method thereof |
| CN104858357A (en) * | 2015-05-07 | 2015-08-26 | 马鞍山市恒毅机械制造有限公司 | Precoated sand with high-temperature resistance and good compactness and preparation method thereof |
| CN104985106A (en) * | 2015-07-06 | 2015-10-21 | 安徽三联泵业股份有限公司 | Modified casting sand used for casting pump body and adopting furan resin loaded with nanometer montmorillonite |
| CN104999024A (en) * | 2015-07-06 | 2015-10-28 | 安徽三联泵业股份有限公司 | Nanometre microlite-supported furan resin-modified moulding sand for pump body casting |
| CN105268908A (en) * | 2015-10-08 | 2016-01-27 | 蚌埠冠宜型材科技有限公司 | Molding sand bonding agent with gas generation amount reducing effect |
| CN105414460A (en) * | 2015-11-23 | 2016-03-23 | 合肥李诺新材料贸易有限公司 | High-pouring-precision composite modified sodium silicate-bonded sand for pump valve casting and preparation method thereof |
| CN105964925A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Montmorillonite-polyurethane emulsion composite water-soluble mold core and preparation method thereof |
| CN108296423A (en) * | 2017-10-27 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of casting binder and preparation method thereof, the method for utilizing the binder and modified straw powder to prepare 3D printing precoated sand |
| CN112692225A (en) * | 2019-10-22 | 2021-04-23 | 柳晶（溧阳）环保科技有限公司 | Ultra-high temperature resistant precoated sand |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103567368A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Molding sand with high wet-heat tensile strength and preparation method thereof |
| CN103567367A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Anti-sticking molding sand for casting and preparation method thereof |
| CN103521685A (en) * | 2013-10-16 | 2014-01-22 | 合肥市田源精铸有限公司 | Modified sand of nano sepiolite, and preparation method thereof |
| CN104084518B (en) * | 2014-06-13 | 2015-12-02 | 吴江市液铸液压件铸造有限公司 | A kind of resistance to hot precoated sand and preparation method thereof |
| CN104084518A (en) * | 2014-06-13 | 2014-10-08 | 吴江市液铸液压件铸造有限公司 | Heatproof precoated sand and preparation method thereof |
| CN104162624A (en) * | 2014-07-22 | 2014-11-26 | 浙江太阳股份有限公司 | Special glue for shell type bonding and preparation process thereof |
| CN104226888B (en) * | 2014-08-29 | 2016-07-06 | 吴江市液铸液压件铸造有限公司 | A kind of easy defeated and dispersed precoated sand and preparation method thereof |
| CN104226888A (en) * | 2014-08-29 | 2014-12-24 | 吴江市液铸液压件铸造有限公司 | Easily-scattered precoated sand and preparation method thereof |
| CN104858357A (en) * | 2015-05-07 | 2015-08-26 | 马鞍山市恒毅机械制造有限公司 | Precoated sand with high-temperature resistance and good compactness and preparation method thereof |
| CN104985106A (en) * | 2015-07-06 | 2015-10-21 | 安徽三联泵业股份有限公司 | Modified casting sand used for casting pump body and adopting furan resin loaded with nanometer montmorillonite |
| CN104999024A (en) * | 2015-07-06 | 2015-10-28 | 安徽三联泵业股份有限公司 | Nanometre microlite-supported furan resin-modified moulding sand for pump body casting |
| CN105268908A (en) * | 2015-10-08 | 2016-01-27 | 蚌埠冠宜型材科技有限公司 | Molding sand bonding agent with gas generation amount reducing effect |
| CN105414460A (en) * | 2015-11-23 | 2016-03-23 | 合肥李诺新材料贸易有限公司 | High-pouring-precision composite modified sodium silicate-bonded sand for pump valve casting and preparation method thereof |
| CN105964925A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Montmorillonite-polyurethane emulsion composite water-soluble mold core and preparation method thereof |
| CN108296423A (en) * | 2017-10-27 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of casting binder and preparation method thereof, the method for utilizing the binder and modified straw powder to prepare 3D printing precoated sand |
| CN108296423B (en) * | 2017-10-27 | 2020-01-10 | 柳州市柳晶科技股份有限公司 | Casting binder, preparation method thereof and method for preparing 3D printing precoated sand by using binder and modified straw powder |
| CN112692225A (en) * | 2019-10-22 | 2021-04-23 | 柳晶（溧阳）环保科技有限公司 | Ultra-high temperature resistant precoated sand |
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Application publication date: 20130807 |