CN104668440A - Environment-friendly casting coated sand and method for preparing the coated sand - Google Patents

Environment-friendly casting coated sand and method for preparing the coated sand Download PDF

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Publication number
CN104668440A
CN104668440A CN201510058066.0A CN201510058066A CN104668440A CN 104668440 A CN104668440 A CN 104668440A CN 201510058066 A CN201510058066 A CN 201510058066A CN 104668440 A CN104668440 A CN 104668440A
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China
Prior art keywords
sand
parts
mixed
coated sand
add
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Pending
Application number
CN201510058066.0A
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Chinese (zh)
Inventor
俞学林
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FANCHANG JINKE ELECTRICAL AND MECHANICAL TECHNOLOGY Co Ltd
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FANCHANG JINKE ELECTRICAL AND MECHANICAL TECHNOLOGY Co Ltd
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Priority to CN201510058066.0A priority Critical patent/CN104668440A/en
Publication of CN104668440A publication Critical patent/CN104668440A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02Compositions 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16Compositions 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
    • B22C1/167Mixtures of inorganic and organic binding agents

Abstract

The invention discloses an environment-friendly casting coated sand, which is prepared by the following raw materials in parts by weight: 70-75 parts of quartz sand, 0.2-0.3 part of calcium stearate, 4-6 parts of corncob powder, 13-15 parts of magnesium olivine sands, 2-3 parts of water, 0.7-1 part of urotropine, 4-6 parts of a thermoplastic phenolic resin, 3-5 parts of isopropanol, 5-7 parts of Portland cement, 2.5-4 parts of boric acid, and 5-7 parts of a synergistic agent. An inorganic silicate binder is added into the environment-friendly casting coated sand, so that the use amount of the phenolic resin is reduced and the environment-friendly casting coated sand is still good in cohesiveness and strength; the boric acid is added so that the heat resisting property of the product is improved; the synergistic agent prepared by a special process is added into the environment-friendly casting coated sand, so that liquidity, breathability, heat dispersion and strength of the coated sand are enhanced, and the surface of the environment-friendly casting coated sand isn't easy to crack and deform. By adopting the prepared product, the environmental pollution can be alleviated and the production cost is reduced, the amount of generated gas is low, the casting quality is high and the casting surface is smooth.

Description

A kind of environmentally friendly Foundry Coated Sand and preparation method thereof
Technical field
The present invention relates to molding sand technical field, particularly a kind of environmentally friendly Foundry Coated Sand and preparation method thereof.
Background technology
Precoated sand is covered with molding sand or the core sand of one deck hard resin film on sand grain surface before referring to moulding.Widely used is in recent years the production technology of hot method precoated sand, namely sand is preheating to uniform temperature, adds resin and make its melting, stirs and makes resin-coating at sand grain surface, add the methenamine aqueous solution and lubricant, cooling, broken, sieve to obtain precoated sand.Because precoated sand has that intensity is high, gas forming amount is low, production casting dimension accuracy is high, any surface finish, is convenient to the advantages such as preservation, apply increasingly extensive in recent years.The binding agent of existing preparation casting precoated sand mostly is resin, and organic resin scent of, in the whole process of Foundry Production, all can cause harmful effect to environment from mulling, coremaking, cast, cleaning to antiquated sand process.Most inorganic resin is the derived product of oil, and belong to non-renewable resources, cost is also higher.
The present invention adds inorganic silicate binding agent in formula, thus reduces the consumption of phenolic resins, has good caking property and intensity equally, also added the composition that boric acid etc. improves heat resisting temperature.The present invention is by research, also add a kind of synergist and modification is carried out to common precoated sand, this synergist includes ventilative good maize straw, potter's clay, the compositions such as the Graphene of rapid heat dissipation, made by special process, enhance the mobility of precoated sand, gas permeability, thermal diffusivity and intensity, surface compact is craze and transfiguration not easily.The product that the present invention makes, can alleviate the pollution to environment, reduce production cost, gas forming amount is low, and casting quality is high, smooth surface.
Summary of the invention
The object of this invention is to provide a kind of environmentally friendly Foundry Coated Sand and preparation method thereof.
In order to realize object of the present invention, the present invention is by following scheme implementation:
A kind of environmentally friendly Foundry Coated Sand, is made up of the raw material of following weight portion: quartz sand 70-75, calcium stearate 0.2-0.3, maize cob meal 4-6, forsterite sand 13-15, water 2-3, methenamine 0.7-1, novolac resin 4-6, isopropyl alcohol 3-5, portland cement 5-7, boric acid 2.5-4, synergist 5-7;
Described synergist is prepared from by the raw material of following weight portion: maize straw 4-6, starch 2-3, waterglass 3-5, calcium hydroxide 1.5-2.5, magnesium chloride 1-2, Graphene 4-5, potter's clay 20-25, zirconium English powder 9-11, dibutyl phthalate 3-4, water 9-12; Preparation method is as follows: maize straw crushed after being dried is become 80-100 object powder and potter's clay, starch mixing and stirring, add water to stir, temperature control is at 60 DEG C-80 DEG C, keep 1-1.5 hour, then add all the other residual components except waterglass, dibutyl phthalate, mixing 20-30 minute, add waterglass, dibutyl phthalate again, put into puddle mixer wet mixing 20-30 second, post-drying of shaking out, final powder is broken into 200-250 order and get final product.
The environmentally friendly Foundry Coated Sand of one of the present invention, be made up of following concrete steps:
(1) quartz sand, maize cob meal, forsterite sand, portland cement are put into pulverizer and pulverized, cross 200-300 mesh sieve and form mixed sand, then fluidized bed furnace is heated to 160 DEG C, starts fluidized bed furnace inner blower, slowly add mixed sand, by the heating temperatures of mixed sand to 140 DEG C-150 DEG C;
(2) be put in puddle mixer by the mixed sand after heating, keep 160 DEG C of constant temperature, add the novolac resin of 0.6 times amount while mixed grind, continuation mixed grind 70-80 adds the novolac resin of surplus again after second;
(3) by boric acid, methenamine is water-soluble is mixed to form mixed liquor with isopropyl alcohol, then slowly joins 70% of mixed liquor in puddle mixer, after continuing hot lower mixed grind 75-85 second, then add the mixed liquor of surplus, continue mixed grind 10-20 second;
(4) close puddle mixer heating tube, be blown into cold front heavy rain mixed sand, when being cooled to about 100 DEG C, add all the other residual components equably, mix 30-35 second, then shake out in disintegrating machine, air-cooled to fragmentation when 40 DEG C-60 DEG C, be screened in cooler, air-cooled to less than 35 DEG C, pack of shaking out is for subsequent use.
Excellent effect of the present invention is: the present invention adds inorganic silicate binding agent in formula, thus reduces the consumption of phenolic resins, has good caking property and intensity equally; With the addition of boric acid, improve product heat resistance; The present invention also adds the synergist that a kind of special process is made, and enhance the mobility of precoated sand, gas permeability, thermal diffusivity and intensity, surface compact is craze and transfiguration not easily.The product that the present invention makes, can alleviate the pollution to environment, reduce production cost, gas forming amount is low, and casting quality is high, smooth surface.
Detailed description of the invention
Below by instantiation, the present invention is described in detail.
A kind of environmentally friendly Foundry Coated Sand, is made up of the raw material of following weight portion (kilogram): quartz sand 70, calcium stearate 0.2, maize cob meal 4, forsterite sand 13, water 2, methenamine 0.7, novolac resin 4, isopropyl alcohol 3, portland cement 5, boric acid 2.5, synergist 5;
Described synergist is prepared from by the raw material of following weight portion (kilogram): maize straw 4, starch 2, waterglass 3, calcium hydroxide 1.5, magnesium chloride 1, Graphene 4, potter's clay 20, zirconium English powder 9, dibutyl phthalate 3, water 9; Preparation method is as follows: maize straw crushed after being dried is become 100 object powder and potter's clay, starch mixing and stirring, add water to stir, temperature control is at 60 DEG C-80 DEG C, keep 1 hour, then add all the other residual components except waterglass, dibutyl phthalate, mix 20 minutes, add waterglass, dibutyl phthalate again, put into puddle mixer wet mixing 20 seconds, post-drying of shaking out, final powder is broken into 200 orders and get final product.
The environmentally friendly Foundry Coated Sand of one of the present invention, be made up of following concrete steps:
(1) quartz sand, maize cob meal, forsterite sand, portland cement are put into pulverizer and pulverized, cross 200 mesh sieves and form mixed sand, then fluidized bed furnace is heated to 160 DEG C, starts fluidized bed furnace inner blower, slowly add mixed sand, by the heating temperatures of mixed sand to 140 DEG C-150 DEG C;
(2) mixed sand after heating is put in puddle mixer, keeps 160 DEG C of constant temperature, while mixed grind, add the novolac resin of 0.6 times amount, continue mixed grind adds surplus again novolac resin after 75 seconds;
(3) by boric acid, methenamine is water-soluble is mixed to form mixed liquor with isopropyl alcohol, then slowly joins 70% of mixed liquor in puddle mixer, continues hot lower mixed grind after 80 seconds, then add the mixed liquor of surplus, continues mixed grind 10 seconds;
(4) close puddle mixer heating tube, be blown into cold front heavy rain mixed sand, when being cooled to about 100 DEG C, add all the other residual components equably, mixed 30 seconds, then shake out in disintegrating machine, air-cooled to fragmentation when 40 DEG C-60 DEG C, be screened in cooler, air-cooled to less than 35 DEG C, pack of shaking out is for subsequent use.
The performance test of the present embodiment precoated sand is as follows: normal temperature bending strength is 6.0MPa, and hot bending strength is 3.1MPa, burning decrement 2.5%, and fusing point is 99 DEG C.

Claims (2)

1. an environmentally friendly Foundry Coated Sand, it is characterized in that, be made up of the raw material of following weight portion: quartz sand 70-75, calcium stearate 0.2-0.3, maize cob meal 4-6, forsterite sand 13-15, water 2-3, methenamine 0.7-1, novolac resin 4-6, isopropyl alcohol 3-5, portland cement 5-7, boric acid 2.5-4, synergist 5-7;
Described synergist is prepared from by the raw material of following weight portion: maize straw 4-6, starch 2-3, waterglass 3-5, calcium hydroxide 1.5-2.5, magnesium chloride 1-2, Graphene 4-5, potter's clay 20-25, zirconium English powder 9-11, dibutyl phthalate 3-4, water 9-12; Preparation method is as follows: maize straw crushed after being dried is become 80-100 object powder and potter's clay, starch mixing and stirring, add water to stir, temperature control is at 60 DEG C-80 DEG C, keep 1-1.5 hour, then add all the other residual components except waterglass, dibutyl phthalate, mixing 20-30 minute, add waterglass, dibutyl phthalate again, put into puddle mixer wet mixing 20-30 second, post-drying of shaking out, final powder is broken into 200-250 order and get final product.
2. a kind of environmentally friendly Foundry Coated Sand according to claim 1, is characterized in that, be made up of following concrete steps:
(1) quartz sand, maize cob meal, forsterite sand, portland cement are put into pulverizer and pulverized, cross 200-300 mesh sieve and form mixed sand, then fluidized bed furnace is heated to 160 DEG C, starts fluidized bed furnace inner blower, slowly add mixed sand, by the heating temperatures of mixed sand to 140 DEG C-150 DEG C;
(2) be put in puddle mixer by the mixed sand after heating, keep 160 DEG C of constant temperature, add the novolac resin of 0.6 times amount while mixed grind, continuation mixed grind 70-80 adds the novolac resin of surplus again after second;
(3) by boric acid, methenamine is water-soluble is mixed to form mixed liquor with isopropyl alcohol, then slowly joins 70% of mixed liquor in puddle mixer, after continuing hot lower mixed grind 75-85 second, then add the mixed liquor of surplus, continue mixed grind 10-20 second;
(4) close puddle mixer heating tube, be blown into cold front heavy rain mixed sand, when being cooled to about 100 DEG C, add all the other residual components equably, mix 30-35 second, then shake out in disintegrating machine, air-cooled to fragmentation when 40 DEG C-60 DEG C, be screened in cooler, air-cooled to less than 35 DEG C, pack of shaking out is for subsequent use.
CN201510058066.0A 2015-02-04 2015-02-04 Environment-friendly casting coated sand and method for preparing the coated sand Pending CN104668440A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN105436411A (en) * 2015-12-30 2016-03-30 青岛博泰美联化工技术有限公司 High-permeability evaporative pattern casting method
CN105499497A (en) * 2015-12-30 2016-04-20 青岛博泰美联化工技术有限公司 V-method casting process
CN107282861A (en) * 2017-07-03 2017-10-24 李吕军 Reduce precoated sand of cast member surface coloured speckle and preparation method thereof
CN107377864A (en) * 2017-07-25 2017-11-24 江苏亚威铸造材料科技有限公司 Dustless processing technology of precoated sand and preparation method thereof
CN107457348A (en) * 2017-09-29 2017-12-12 马鞍山松鹤信息科技有限公司 A kind of heavy castings molding sand and preparation method thereof
CN110860646A (en) * 2019-12-05 2020-03-06 中铁山桥集团有限公司 Foundry sand composition and casting method

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Publication number Priority date Publication date Assignee Title
JPS57139442A (en) * 1981-02-23 1982-08-28 Asahi Organic Chem Ind Co Ltd Resin-coated sand grains for forming mold and mold formed of this sand grain
US4381354A (en) * 1981-02-23 1983-04-26 Asahi Yukizai Kogyo Co., Ltd. Resin coated sand and casting molds prepared therefrom
CN102773401A (en) * 2012-08-27 2012-11-14 重庆长江造型材料(集团)有限公司 Method for preparing precoated sand by using silicate inorganic binder
CN103042161A (en) * 2012-12-25 2013-04-17 马鞍山市万鑫铸造有限公司 Quartz sand contained moulding sand and preparation method thereof
CN103231011A (en) * 2013-04-16 2013-08-07 繁昌县恒鑫汽车零部件有限公司 Phenol formaldehyde resin precoated sand
CN103231010A (en) * 2013-04-16 2013-08-07 繁昌县恒鑫汽车零部件有限公司 Easy-collapsibility type precoated sand
CN103272997A (en) * 2013-04-16 2013-09-04 繁昌县恒鑫汽车零部件有限公司 Precoated sand for iron casting

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57139442A (en) * 1981-02-23 1982-08-28 Asahi Organic Chem Ind Co Ltd Resin-coated sand grains for forming mold and mold formed of this sand grain
US4381354A (en) * 1981-02-23 1983-04-26 Asahi Yukizai Kogyo Co., Ltd. Resin coated sand and casting molds prepared therefrom
CN102773401A (en) * 2012-08-27 2012-11-14 重庆长江造型材料(集团)有限公司 Method for preparing precoated sand by using silicate inorganic binder
CN103042161A (en) * 2012-12-25 2013-04-17 马鞍山市万鑫铸造有限公司 Quartz sand contained moulding sand and preparation method thereof
CN103231011A (en) * 2013-04-16 2013-08-07 繁昌县恒鑫汽车零部件有限公司 Phenol formaldehyde resin precoated sand
CN103231010A (en) * 2013-04-16 2013-08-07 繁昌县恒鑫汽车零部件有限公司 Easy-collapsibility type precoated sand
CN103272997A (en) * 2013-04-16 2013-09-04 繁昌县恒鑫汽车零部件有限公司 Precoated sand for iron casting

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN105436411A (en) * 2015-12-30 2016-03-30 青岛博泰美联化工技术有限公司 High-permeability evaporative pattern casting method
CN105499497A (en) * 2015-12-30 2016-04-20 青岛博泰美联化工技术有限公司 V-method casting process
CN105436411B (en) * 2015-12-30 2018-08-17 青岛立准金属有限公司 A kind of high ventilative lost-foam casting method
CN107282861A (en) * 2017-07-03 2017-10-24 李吕军 Reduce precoated sand of cast member surface coloured speckle and preparation method thereof
CN107377864A (en) * 2017-07-25 2017-11-24 江苏亚威铸造材料科技有限公司 Dustless processing technology of precoated sand and preparation method thereof
CN107457348A (en) * 2017-09-29 2017-12-12 马鞍山松鹤信息科技有限公司 A kind of heavy castings molding sand and preparation method thereof
CN110860646A (en) * 2019-12-05 2020-03-06 中铁山桥集团有限公司 Foundry sand composition and casting method

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