CN103567362A - Pre-coated sand with high strength and low gas evolution rate and preparation method thereof - Google Patents

Pre-coated sand with high strength and low gas evolution rate and preparation method thereof Download PDF

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Publication number
CN103567362A
CN103567362A CN201310472842.2A CN201310472842A CN103567362A CN 103567362 A CN103567362 A CN 103567362A CN 201310472842 A CN201310472842 A CN 201310472842A CN 103567362 A CN103567362 A CN 103567362A
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China
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parts
sand
strength
add
nano
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CN201310472842.2A
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Chinese (zh)
Inventor
吴寿涛
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铜陵市经纬流体科技有限公司
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Priority to CN201310472842.2A priority Critical patent/CN103567362A/en
Publication of CN103567362A publication Critical patent/CN103567362A/en

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Abstract

The invention discloses pre-coated sand with high strength and a low gas evolution rate and a preparation method thereof. The pre-coated sand with high strength and low gas evolution rate is prepared from the following raw materials in parts by weight: 60-80 parts of quartz sand, 15-20 parts of celestite, 5-10 parts of wollastonite, 0.4-0.8 parts of ethenyl tri(beta-methoxyethyoxyl) silane, 4-6 parts of pentaerythritol oleate, 3-5 parts of epoxy soybean oil, 2-3 parts of nano magnesium oxide, 0.5-1.5 parts of bisphenol A epoxy resin, 1-2 parts of thermosetting phenol resin, 3-6 parts of diaminodiphenyl methane, 5-10 parts of urotropine, 4-8 parts of calcium stearate and 3-5 parts of composite powder. Compared with the conventional pre-coated sand, the pre-coated sand disclosed by the invention is not only high in strength, good in heat resistance, good in mobility and small in roughness, but also good in gas permeability and low in gas evolution rate, so that a casting piece can be effectively prevented from generating defects such as pin holes, nitrogen gas holes and burnt-on sand, and therefore, the yield of the casting piece is greatly improved.

Description

The low precoated sand and preparation method thereof of getting angry of high strength
Technical field
The present invention relates to the low precoated sand and preparation method thereof of getting angry of a kind of high strength, belong to molding sand technical field.
Background technology
Precoated sand refers to that sand grain surface is covered with molding sand or the core sand of one deck hard resin film before moulding.Precoated sand is used for making core, and to have coremaking process simple, and production efficiency is high, and sclerous reaction is fast, is out of shape littlely, and precision is high, and core can not produce creep, the feature such as can use for a long time, is widely used in steel-casting, ironcasting.But also exist weak point, such as gas forming amount is larger, the foundry goods of production easily produces the defects such as pin hole, nitrogen pore.Therefore, must improve the performance of existing precoated sand, make it meet Production requirement.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, improve the low precoated sand and preparation method thereof of getting angry of a kind of high strength, effectively prevent that foundry goods from producing pin hole, nitrogen pore.
The technical solution used in the present invention is as follows:
The low precoated sand of getting angry, is made by the raw material of following weight portion: quartz sand 60-80, celestine 15-20, wollastonite 5-10, vinyl three ('beta '-methoxy ethyoxyl) silane 0.4-0.8, PETO 4-6, epoxidized soybean oil 3-5, nano magnesia 2-3, bisphenol A type epoxy resin 0.5-1.5, thermosetting phenolic resin 1-2, MDA 3-6, methenamine 5-10, calcium stearate 4-8, composite powder 3-5;
The preparation method of described composite powder is as follows: a, by weight 3-5:2-4:1-2, take pyrophillite, bauxite and volcanic rock and mix, pulverized 200-300 mesh sieve, then be placed in the hydrochloric acid solution that concentration is 15-20%, be heated to boiling speed lapping 10-15min, the sodium hydroxide solution regulator solution PH that is 15-20% by concentration again, to neutral, stirs 5-10min under 60-70 ℃ of bath temperature, filters, with distilled water, clean filter residue, dry; The powder of b, above-mentioned oven dry adds water making beating and makes the slurry that solid content is 55-65%, then adds the calgon of 3-5%, the sucrose polyethenoxy ether of the neopelex of 2-3%, 1-2% and the triethanolamine of 2-3%, and speed lapping 10-15min is stand-by; C, get the nano aluminum colloidal sol that is equivalent to pyrophillite amount 15-25% and add in mixer, under stirring, add the sodium lignin sulfonate, the nanometer jade powder of 3-4%, the nano aluminum nitride of 2-3% of 1-2%, the polyglyceryl fatty acid ester of the nano zinc powder of 0.5-1% and 1-2%, under 50-60 ℃ of bath temperature, stir 20-30min, stand-by; D, the nano aluminum colloidal sol after step (c) is processed mix with the slurry that step (b) makes, add the Silicone acrylic emulsion of 5-8%, the sodium carboxymethylcellulose of the polyvinyl acetate emulsion of 3-6%, 2-3%, the Lauryl Alcohol ester of the butyl glycol ether of 0.5-1% and 1-2%, stir 30-40min, filter, dry, pulverize, cross 200-300 mesh sieve;
The solid content of nano aluminum colloidal sol described in above-mentioned preparation method is 15-20%; Described Silicone acrylic emulsion solid content is 40-45%; Described polyvinyl acetate emulsion solid content is 20-30%.
The preparation method of the low precoated sand of getting angry of a kind of high strength, comprise the following steps: by quartz sand, celestine, wollastonite co-grinding, cross 150-200 mesh sieve and vinyl three ('beta '-methoxy ethyoxyl) silane, PETO and nano magnesia mixed grind 60-80s, then be heated to 140-160 ℃, under stirring, add bisphenol A type epoxy resin, thermosetting phenolic resin and epoxidized soybean oil mixed grind 40-50s; Sand temperature drop during to 100-110 ℃, adds MDA and methenamine mixed grind 10-15s, then adds calcium stearate and composite powder mixed grind 45-55s; When sand temperature drop to 70 ℃ is following, unload sand, cooling, fragmentation, screening.
Beneficial effect of the present invention:
Precoated sand of the present invention is compared with traditional precoated sand, and not only intensity is high, good heat resistance, good fluidity, roughness is little, and good permeability, and gas forming amount is low, suppress the generation of nitrogen, can effectively avoid foundry goods to produce the defects such as pin hole, nitrogen pore, scab, greatly improved the yield rate of foundry goods.
The specific embodiment
The low precoated sand of getting angry, is made by the raw material of following weight portion: quartz sand 70, celestine 20, wollastonite 10, vinyl three ('beta '-methoxy ethyoxyl) silane 0.6, PETO 5, epoxidized soybean oil 4, nano magnesia 2, bisphenol A type epoxy resin 1, thermosetting phenolic resin 1.5, MDA 4, methenamine 6, calcium stearate 5, composite powder 4;
The preparation method of described composite powder is as follows: a, by weight 4:3:2, take pyrophillite, bauxite and volcanic rock and mix, pulverized 250 mesh sieves, then be placed in concentration and be 16% hydrochloric acid solution, be heated to boiling speed lapping 12min, the sodium hydroxide solution regulator solution PH that is 18% by concentration again, to neutral, stirs 8min under 65 ℃ of bath temperatures, filters, with distilled water, clean filter residue, dry; The powder of b, above-mentioned oven dry adds water making beating, and to make solid content be 60% slurry, then add 4% calgon, 2% neopelex, 1.5% sucrose polyethenoxy ether and 2% triethanolamine, and speed lapping 10min is stand-by; C, get the nano aluminum colloidal sol that is equivalent to pyrophillite amount 20% and add in mixer, under stirring, add 1.5% sodium lignin sulfonate, 3% nanometer jade powder, 2% nano aluminum nitride, 0.8% nano zinc powder and 1.5% polyglyceryl fatty acid ester, under 60 ℃ of bath temperatures, stir 25min, stand-by; D, the nano aluminum colloidal sol after step (c) is processed mix with the slurry that step (b) makes, add 6% Silicone acrylic emulsion, 4% polyvinyl acetate emulsion, 2% sodium carboxymethylcellulose, 0.5% butyl glycol ether and 1.5% Lauryl Alcohol ester, stir 35min, filter, dry, pulverize, cross 200-300 mesh sieve;
The solid content of nano aluminum colloidal sol described in above-mentioned preparation method is 18%; Described Silicone acrylic emulsion solid content is 42%; Described polyvinyl acetate emulsion solid content is 25%.
The preparation method of the low precoated sand of getting angry of a kind of high strength, comprise the following steps: by quartz sand, celestine, wollastonite co-grinding, cross 200 mesh sieves and vinyl three ('beta '-methoxy ethyoxyl) silane, PETO and nano magnesia mixed grind 70s, then be heated to 150 ℃, under stirring, add bisphenol A type epoxy resin, thermosetting phenolic resin and epoxidized soybean oil mixed grind 45s; During sand temperature drop to 105 ℃, add MDA and methenamine mixed grind 10s, then add calcium stearate and composite powder mixed grind 50s; When sand temperature drop to 70 ℃ is following, unload sand, cooling, fragmentation, screening.
The performance test of the present embodiment molding sand is as follows:
Normal temperature bending strength (MPa): 10.6
Hot bending strength (MPa): 5.1
Gas forming amount (ml/g): 7.2
Burning decrement (%): 0.48.

Claims (2)

1. the low precoated sand of getting angry of high strength, it is characterized in that, by the raw material of following weight portion, made: quartz sand 60-80, celestine 15-20, wollastonite 5-10, vinyl three ('beta '-methoxy ethyoxyl) silane 0.4-0.8, PETO 4-6, epoxidized soybean oil 3-5, nano magnesia 2-3, bisphenol A type epoxy resin 0.5-1.5, thermosetting phenolic resin 1-2, MDA 3-6, methenamine 5-10, calcium stearate 4-8, composite powder 3-5;
The preparation method of described composite powder is as follows: a, by weight 3-5:2-4:1-2, take pyrophillite, bauxite and volcanic rock and mix, pulverized 200-300 mesh sieve, then be placed in the hydrochloric acid solution that concentration is 15-20%, be heated to boiling speed lapping 10-15min, the sodium hydroxide solution regulator solution PH that is 15-20% by concentration again, to neutral, stirs 5-10min under 60-70 ℃ of bath temperature, filters, with distilled water, clean filter residue, dry; The powder of b, above-mentioned oven dry adds water making beating and makes the slurry that solid content is 55-65%, then adds the calgon of 3-5%, the sucrose polyethenoxy ether of the neopelex of 2-3%, 1-2% and the triethanolamine of 2-3%, and speed lapping 10-15min is stand-by; C, get the nano aluminum colloidal sol that is equivalent to pyrophillite amount 15-25% and add in mixer, under stirring, add the sodium lignin sulfonate, the nanometer jade powder of 3-4%, the nano aluminum nitride of 2-3% of 1-2%, the polyglyceryl fatty acid ester of the nano zinc powder of 0.5-1% and 1-2%, under 50-60 ℃ of bath temperature, stir 20-30min, stand-by; D, the nano aluminum colloidal sol after step (c) is processed mix with the slurry that step (b) makes, add the Silicone acrylic emulsion of 5-8%, the sodium carboxymethylcellulose of the polyvinyl acetate emulsion of 3-6%, 2-3%, the Lauryl Alcohol ester of the butyl glycol ether of 0.5-1% and 1-2%, stir 30-40min, filter, dry, pulverize, cross 200-300 mesh sieve;
The solid content of nano aluminum colloidal sol described in above-mentioned preparation method is 15-20%; Described Silicone acrylic emulsion solid content is 40-45%; Described polyvinyl acetate emulsion solid content is 20-30%.
2. the preparation method of the low precoated sand of getting angry of high strength according to claim 1, it is characterized in that comprising the following steps: by quartz sand, celestine, wollastonite co-grinding, cross 150-200 mesh sieve and vinyl three ('beta '-methoxy ethyoxyl) silane, PETO and nano magnesia mixed grind 60-80s, then be heated to 140-160 ℃, under stirring, add bisphenol A type epoxy resin, thermosetting phenolic resin and epoxidized soybean oil mixed grind 40-50s; Sand temperature drop during to 100-110 ℃, adds MDA and methenamine mixed grind 10-15s, then adds calcium stearate and composite powder mixed grind 45-55s; When sand temperature drop to 70 ℃ is following, unload sand, cooling, fragmentation, screening.
CN201310472842.2A 2013-10-11 2013-10-11 Pre-coated sand with high strength and low gas evolution rate and preparation method thereof CN103567362A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104690211A (en) * 2015-02-04 2015-06-10 繁昌县金科机电科技有限公司 Fast-cured precoated sand for hot method and preparation method thereof
CN104690213A (en) * 2015-02-04 2015-06-10 繁昌县金科机电科技有限公司 Coated sand with cracking resistance, smell removal and less adhesion to sand and preparation method thereof
CN104690215A (en) * 2015-02-04 2015-06-10 繁昌县金科机电科技有限公司 Synergist-added coated sand for casting and preparation method of synergist-added coated sand
CN104690212A (en) * 2015-02-04 2015-06-10 繁昌县金科机电科技有限公司 Pre-coated sand with uniform shell layer and unshelled performance and preparation method of pre-coated sand
CN104690214A (en) * 2015-02-04 2015-06-10 繁昌县金科机电科技有限公司 Precoated sand added with multiple resins for hot method and preparation method of precoated sand
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
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
CN105562587A (en) * 2016-02-29 2016-05-11 无锡烨隆精密机械有限公司 Molding sand for reducing cracks on casting and application of molding sand
CN105945207A (en) * 2016-05-26 2016-09-21 合肥市田源精铸有限公司 High-strength high-temperature resistant precoated sand
CN106077433A (en) * 2016-08-18 2016-11-09 江阴联华铸造有限公司 A kind of automotive casting is with high temperature resistant low overlay film core sand and preparation method thereof of getting angry
CN108296477A (en) * 2017-09-29 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
CN109020607A (en) * 2018-10-19 2018-12-18 合肥仁创铸造材料有限公司 A kind of dedusting ash ceramsite sand and the preparation method and application thereof
CN109047645A (en) * 2018-09-30 2018-12-21 宁波嘉达精密铸造有限公司 A kind of sand mold casting mold and the method for preparing bucket tooth tooth tip using the sand mold casting mold
CN109079094A (en) * 2018-08-03 2018-12-25 定远县宝隆机械制造有限公司 The thermally conductive uniform moulding sand for casting of one kind and its manufacturing process

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CN103341587A (en) * 2013-07-09 2013-10-09 临沂市铸宝水表有限公司 Precoated sand and burn-free regeneration technology thereof

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CN1032127A (en) * 1987-04-04 1989-04-05 天津市南开区铸造涂料厂 Composite type binding material for casting
CN101733361A (en) * 2010-01-06 2010-06-16 东华大学 Sand burning preventing coal dust free green sand for casting and preparation method thereof
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104690211A (en) * 2015-02-04 2015-06-10 繁昌县金科机电科技有限公司 Fast-cured precoated sand for hot method and preparation method thereof
CN104690213A (en) * 2015-02-04 2015-06-10 繁昌县金科机电科技有限公司 Coated sand with cracking resistance, smell removal and less adhesion to sand and preparation method thereof
CN104690215A (en) * 2015-02-04 2015-06-10 繁昌县金科机电科技有限公司 Synergist-added coated sand for casting and preparation method of synergist-added coated sand
CN104690212A (en) * 2015-02-04 2015-06-10 繁昌县金科机电科技有限公司 Pre-coated sand with uniform shell layer and unshelled performance and preparation method of pre-coated sand
CN104690214A (en) * 2015-02-04 2015-06-10 繁昌县金科机电科技有限公司 Precoated sand added with multiple resins for hot method and preparation method of precoated sand
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
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
CN105562587A (en) * 2016-02-29 2016-05-11 无锡烨隆精密机械有限公司 Molding sand for reducing cracks on casting and application of molding sand
CN105945207A (en) * 2016-05-26 2016-09-21 合肥市田源精铸有限公司 High-strength high-temperature resistant precoated sand
CN106077433A (en) * 2016-08-18 2016-11-09 江阴联华铸造有限公司 A kind of automotive casting is with high temperature resistant low overlay film core sand and preparation method thereof of getting angry
CN108296477A (en) * 2017-09-29 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
CN109079094A (en) * 2018-08-03 2018-12-25 定远县宝隆机械制造有限公司 The thermally conductive uniform moulding sand for casting of one kind and its manufacturing process
CN109047645A (en) * 2018-09-30 2018-12-21 宁波嘉达精密铸造有限公司 A kind of sand mold casting mold and the method for preparing bucket tooth tooth tip using the sand mold casting mold
CN109047645B (en) * 2018-09-30 2020-08-21 宁波嘉达精密铸造有限公司 Sand casting mold and method for preparing bucket tooth tip by using same
CN109020607A (en) * 2018-10-19 2018-12-18 合肥仁创铸造材料有限公司 A kind of dedusting ash ceramsite sand and the preparation method and application thereof
CN109020607B (en) * 2018-10-19 2021-01-12 合肥仁创铸造材料有限公司 Dedusting ash ceramsite sand and preparation method and application thereof

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Application publication date: 20140212