CN103231011A - Phenol formaldehyde resin precoated sand - Google Patents
Phenol formaldehyde resin precoated sand Download PDFInfo
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- CN103231011A CN103231011A CN201310132990XA CN201310132990A CN103231011A CN 103231011 A CN103231011 A CN 103231011A CN 201310132990X A CN201310132990X A CN 201310132990XA CN 201310132990 A CN201310132990 A CN 201310132990A CN 103231011 A CN103231011 A CN 103231011A
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Abstract
The invention discloses a phenol formaldehyde resin precoated sand, which comprises base sand, a phenol formaldehyde resin, a curing agent, a lubricant and an additive, wherein the base sand comprises, by weight, 57 parts of magnesia, 65 parts of bauxite sand, and 13 parts of diatomite, a particle size of the base sand is 100-150 mesh, and 3-5 parts by weight of boric acid, 2-4 parts by weight of hexamethylenetetramine, 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 to obtain the curing agent. The phenol formaldehyde resin precoated sand has the following characteristics that: moisture absorption resistance is good, roughness is low, 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 sand in coating phenolic resin, 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, 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:
Sand in coating phenolic resin, comprise roughing sand, phenolic resins, curing agent, lubricant and additive, in weight portion, described roughing sand is made up of 55-60 part magnesia, 60-68 part bauxite sand, 10-16 part diatomite, the granularity of described roughing sand is the 100-150 order, described curing agent is to obtain by 3-5 part boric acid, 2-4 part methenamine, 1-2 part water soluble polymer rubber powder, 3-5 part starch, 0.5-0.8 part rosin, 4-5 part dextrin being added the reaction of 4-6 part water, drying after the reaction; Described lubricant is mixed and is formed by 4-6 part calcium stearate, 1-1.8 part montmorillonite powder, 3-5 part nano powder, 1-2 part aluminum nitride powder, described additive is to forge processing by 4-6 part cement slurry, 2-4 part plant ash, 5-8 part water are mixed to burn, the granularity of cement slurry 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 after the pulverizing at 350-400 ℃;
Its preparation method is as follows: earlier 100 parts of roughing sand are put in the blade mixer, after being heated to 140-170 ℃, in roughing sand, put into 10-12 part phenolic resins mixed grind time 45-50S again, when the roughing sand temperature is reduced to 100-110 ℃, add 2-3 part curing agent, add 5-7 part lubricant and 10-12 part additive 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 57 parts of magnesia, 65 parts of bauxite sand, 13 parts of diatomite.
Described preparation method is as follows: described additive is to forge processing by 5 parts of cement slurries, 3 parts of plant ash, 6 parts of water are mixed to burn, the granularity of cement slurry is 0.6mm, burns and to forge product and 3 parts of montmorillonite powders, 4 parts of waterglass mixing granulations, and roasting is 3 hours again, sintering temperature control obtains after the pulverizing at 380 ℃.
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 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 magnesia, 60-68 part bauxite sand, 10-16 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 design of the constituent of binding agent and weight portion ratio thereof is conducive to raw-material even configuration in the precoated sand, also is 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 4-5S 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 austenitic iron casting greatly.
The specific embodiment
Sand in coating phenolic resin, comprise roughing sand, phenolic resins, curing agent, lubricant and additive, in weight portion, described roughing sand is made up of 57 parts of magnesia, 65 parts of bauxite sand, 13 parts of diatomite, the granularity of described roughing sand is the 100-150 order, described curing agent is to obtain by 3-5 part boric acid, 2-4 part methenamine, 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 lubricant is mixed and is formed by 4-6 part calcium stearate, 1-1.8 part montmorillonite powder, 3-5 part nano powder, 1-2 part aluminum nitride powder, described additive is to forge processing by 5 parts of cement slurries, 3 parts of plant ash, 6 parts of water are mixed to burn, the granularity of cement slurry is 0.6mm, burning is forged product and 3 parts of montmorillonite powders, 4 parts of waterglass mixing granulations, roasting is 3 hours again, sintering temperature control obtains after the pulverizing at 380 ℃;
Its preparation method is as follows: earlier 100 parts of roughing sand are put in the blade mixer, after being heated to 140-170 ℃, in roughing sand, put into 12 parts of phenolic resins mixed grind time 45-50S again, when the roughing sand temperature is reduced to 100-110 ℃, add 2 parts of curing agent, add 7 parts of lubricants and 12 parts of additive 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) | 9.23 |
| Hot bending strength (MPa) | 2.01 |
| Fusing point (℃) | 96.3 |
| Burning decrement (mass fraction) (%) | 0.13 |
Claims (3)
1. sand in coating phenolic resin, comprise roughing sand, phenolic resins, curing agent, lubricant and additive, in weight portion, it is characterized in that: described roughing sand is made up of 55-60 part magnesia, 60-68 part bauxite sand, 10-16 part diatomite, the granularity of described roughing sand is the 100-150 order, described curing agent is to obtain by 3-5 part boric acid, 2-4 part methenamine, 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 lubricant is mixed and is formed by 4-6 part calcium stearate, 1-1.8 part montmorillonite powder, 3-5 part nano powder, 1-2 part aluminum nitride powder, described additive is to forge processing by 4-6 part cement slurry, 2-4 part plant ash, 5-8 part water are mixed to burn, the granularity of cement slurry 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 after the pulverizing at 350-400 ℃;
Its preparation method is as follows: earlier 100 parts of roughing sand are put in the blade mixer, after being heated to 140-170 ℃, in roughing sand, put into 10-12 part phenolic resins mixed grind time 45-50S again, when the roughing sand temperature is reduced to 100-110 ℃, add 2-3 part curing agent, add 5-7 part lubricant and 10-12 part additive 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. sand in coating phenolic resin according to claim 1, it is characterized in that: described roughing sand is made up of 57 parts of magnesia, 65 parts of bauxite sand, 13 parts of diatomite.
3. sand in coating phenolic resin according to claim 1, it is characterized in that: described preparation method is as follows: described additive is to forge processing by 5 parts of cement slurries, 3 parts of plant ash, 6 parts of water are mixed to burn, the granularity of cement slurry is 0.6mm, burning is forged product and 3 parts of montmorillonite powders, 4 parts of waterglass mixing granulations, roasting is 3 hours again, sintering temperature control obtains after the pulverizing at 380 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310132990XA CN103231011A (en) | 2013-04-16 | 2013-04-16 | Phenol formaldehyde resin precoated sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310132990XA CN103231011A (en) | 2013-04-16 | 2013-04-16 | Phenol formaldehyde resin precoated sand |
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| CN103231011A true CN103231011A (en) | 2013-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310132990XA Pending CN103231011A (en) | 2013-04-16 | 2013-04-16 | Phenol formaldehyde resin precoated sand |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104668440A (en) * | 2015-02-04 | 2015-06-03 | 繁昌县金科机电科技有限公司 | Environment-friendly casting coated sand and method for preparing the coated sand |
| CN103600022B (en) * | 2013-11-25 | 2015-06-24 | 柳州市柳晶科技有限公司 | Precoated sand capable of preventing nozzle from leaking sand |
| CN104841863A (en) * | 2015-05-07 | 2015-08-19 | 马鞍山市恒毅机械制造有限公司 | Novel easily collapsible precoated sand and preparation method thereof |
| CN104858355A (en) * | 2015-05-07 | 2015-08-26 | 马鞍山市恒毅机械制造有限公司 | Precoated sand with excellent breathability and heat resistance for hot method and preparation method thereof |
| CN106040959A (en) * | 2016-07-29 | 2016-10-26 | 无锡市三峰仪器设备有限公司 | Novel instrument casting 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 |
| CN106238667A (en) * | 2016-07-29 | 2016-12-21 | 无锡市三峰仪器设备有限公司 | A kind of precoated sand of instrument casting |
| CN107377865A (en) * | 2017-08-07 | 2017-11-24 | 伊婕 | A kind of novel film coating sand and preparation method thereof |
| 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 |
| CN110625058A (en) * | 2019-11-08 | 2019-12-31 | 含山县能华铸造有限公司 | High-air-permeability foundry molding sand and preparation method thereof |
| 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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| CN1274626A (en) * | 2000-06-13 | 2000-11-29 | 秦升益 | Preparation process of heat resisting film-coating sand |
| CN101088659A (en) * | 2007-08-09 | 2007-12-19 | 山东圣泉化工股份有限公司 | Coated low-nitrogen sand and its prepn |
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- 2013-04-16 CN CN201310132990XA patent/CN103231011A/en active Pending
Patent Citations (4)
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| US4206262A (en) * | 1978-01-16 | 1980-06-03 | Acme Resin Corporation | Catechol resins for the shell process |
| JPS57177848A (en) * | 1981-04-24 | 1982-11-01 | Aisin Chem Co Ltd | Production of resin coated sand grain for shell mold |
| CN1274626A (en) * | 2000-06-13 | 2000-11-29 | 秦升益 | Preparation process of heat resisting film-coating sand |
| CN101088659A (en) * | 2007-08-09 | 2007-12-19 | 山东圣泉化工股份有限公司 | Coated low-nitrogen sand and its prepn |
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| 张伟民等: "热塑性酚醛树脂覆膜砂的研究进展", 《高分子通报》, no. 03, 30 June 2004 (2004-06-30) * |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103600022B (en) * | 2013-11-25 | 2015-06-24 | 柳州市柳晶科技有限公司 | Precoated sand capable of preventing nozzle from leaking sand |
| 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 |
| CN104668440A (en) * | 2015-02-04 | 2015-06-03 | 繁昌县金科机电科技有限公司 | Environment-friendly casting coated sand and method for preparing the coated sand |
| CN104841863A (en) * | 2015-05-07 | 2015-08-19 | 马鞍山市恒毅机械制造有限公司 | Novel easily collapsible precoated sand and preparation method thereof |
| CN104858355A (en) * | 2015-05-07 | 2015-08-26 | 马鞍山市恒毅机械制造有限公司 | Precoated sand with excellent breathability and heat resistance for hot method and preparation method thereof |
| CN106040959A (en) * | 2016-07-29 | 2016-10-26 | 无锡市三峰仪器设备有限公司 | Novel instrument casting 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 |
| CN106238667A (en) * | 2016-07-29 | 2016-12-21 | 无锡市三峰仪器设备有限公司 | A kind of precoated sand of instrument casting |
| CN107377865A (en) * | 2017-08-07 | 2017-11-24 | 伊婕 | A kind of novel film coating sand and preparation method thereof |
| 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 |
| 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 |
| CN110625058A (en) * | 2019-11-08 | 2019-12-31 | 含山县能华铸造有限公司 | High-air-permeability foundry molding sand and preparation method thereof |
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Application publication date: 20130807 |