CN103567357A - Anti-vein precoated sand and preparation method thereof - Google Patents
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Abstract
The invention discloses anti-vein precoated sand and a preparation method thereof. The anti-vein precoated sand is prepared from the following raw materials in parts by weight: 80-90 parts of quartz sand, 15-25 parts of menaccanite, 10-15 parts of spodumene, 2-3 parts of boric acid, 2-3 parts of thermoplastic phenolic resin, 0.5-1 part of thermosetting phenol resin, 5-10 parts of cement clinker, 4-7 parts of sulphite liquor, 3-5 parts of corn flour, 2-3 parts of sesbania gum, 1-2 parts of ammonium benzoate, 0.5-0.8 part of gamma-aminopropyl triethoxy silicane, 3-6 parts of dioctyl phthalate, 7-11 parts of urotropine, 2-4 parts of calcium stearate and 3-5 parts of composite powder. The anti-vein precoated sand has strong anti-sand burning and anti-vein capacities, also has the characteristics of high strength, good liquidity, low gas evolution, good heat resistance, good gas permeability and the like, can obviously reduce or eliminate defects of vein, sand burning, pores and the like, effectively improves quality of the inner surface and the outer surface of a casting and is applicable to production of a gray iron bulb iron steel casting.
Description
Technical field
The present invention relates to a kind of anti-vein precoated sand and preparation method thereof, 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, precoated sand easily produces vein defect on casting process medium casting surface.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 a kind of anti-vein precoated sand and preparation method thereof.
The technical solution used in the present invention is as follows:
A vein precoated sand, is made by the raw material of following weight portion: quartz sand 80-90, menaccanite 15-25, spodumene 10-15, boric acid 2-3, novolac resin 2-3, thermosetting phenolic resin 0.5-1, clinker 5-10, spent pulping liquor 4-7, corn flour 3-5, sesbania gum 2-3, ammonium benzoate 1-2, gamma-aminopropyl-triethoxy-silane 0.5-0.8, dioctyl phthalate 3-6, methenamine 7-11, calcium stearate 2-4, 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%.
A kind of preparation method of anti-vein precoated sand, comprise the following steps: by quartz sand, menaccanite and spodumene co-grinding, cross 150-200 mesh sieve and clinker, corn flour and spent pulping liquor mixed grind 30-50s, then be heated to 145-155 ℃, under stirring, add novolac resin, thermosetting phenolic resin, sesbania gum, gamma-aminopropyl-triethoxy-silane and dioctyl phthalate mixed grind 40-60s; Sand temperature drop during to 95-105 ℃, adds methenamine and ammonium benzoate mixed grind 10-15s, then adds boric acid, calcium stearate and composite powder mixed grind 25-35s; 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 not only has very strong anti-stick sand and anti-vein ability, and the features such as intensity is high, good fluidity, gas forming amount are low, good heat resistance, good permeability, can significantly reduce or eliminate the defects such as vein, scab, pore, effectively improve foundry goods surfaces externally and internally quality, be applicable to the production of gray iron magnesium iron steel-casting.
The specific embodiment
A vein precoated sand, is made by the raw material of following weight (kg): quartz sand 85, menaccanite 15, spodumene 12, boric acid 2.5, novolac resin 2, thermosetting phenolic resin 1, clinker 8, spent pulping liquor 5, corn flour 4, sesbania gum 2, ammonium benzoate 1.5, gamma-aminopropyl-triethoxy-silane 0.6, dioctyl phthalate 4, methenamine 9, calcium stearate 3, composite powder 4;
The preparation method of described composite powder is as follows: a, by weight 3:2:1, take pyrophillite, bauxite and volcanic rock and mix, pulverized 200 mesh sieves, then be placed in concentration and be 15% hydrochloric acid solution, be heated to boiling speed lapping 10min, the sodium hydroxide solution regulator solution PH that is 16% by concentration again, to neutral, stirs 8min under 60 ℃ 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 65% slurry, then add 3% calgon, 2% neopelex, 1% 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% sodium lignin sulfonate, 3% nanometer jade powder, 2% nano aluminum nitride, 0.5% nano zinc powder and 1% polyglyceryl fatty acid ester, under 55 ℃ of bath temperatures, stir 20min, stand-by; D, the nano aluminum colloidal sol after step (c) is processed mix with the slurry that step (b) makes, add 5% Silicone acrylic emulsion, 3% polyvinyl acetate emulsion, 2% sodium carboxymethylcellulose, 0.5% butyl glycol ether and 1% Lauryl Alcohol ester, stir 30min, filter, dry, pulverize, cross 200 mesh sieves;
The solid content of nano aluminum colloidal sol described in above-mentioned preparation method is 15%; Described Silicone acrylic emulsion solid content is 42%; Described polyvinyl acetate emulsion solid content is 25%.
A kind of preparation method of anti-vein precoated sand, comprise the following steps: by quartz sand, menaccanite and spodumene co-grinding, cross 200 mesh sieves and clinker, corn flour and spent pulping liquor mixed grind 40s, then be heated to 150 ℃, under stirring, add novolac resin, thermosetting phenolic resin, sesbania gum, gamma-aminopropyl-triethoxy-silane and dioctyl phthalate mixed grind 50s; During sand temperature drop to 98 ℃, add methenamine and ammonium benzoate mixed grind 12s, then add boric acid, calcium stearate and composite powder mixed grind 30s; 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): 9.6
Hot bending strength (MPa): 4.4
Gas forming amount (ml/g): 8.2
Burning decrement (%): 0.61.
Claims (2)
1. an anti-vein precoated sand, it is characterized in that, by the raw material of following weight portion, made: quartz sand 80-90, menaccanite 15-25, spodumene 10-15, boric acid 2-3, novolac resin 2-3, thermosetting phenolic resin 0.5-1, clinker 5-10, spent pulping liquor 4-7, corn flour 3-5, sesbania gum 2-3, ammonium benzoate 1-2, gamma-aminopropyl-triethoxy-silane 0.5-0.8, dioctyl phthalate 3-6, methenamine 7-11, calcium stearate 2-4, 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 anti-vein precoated sand according to claim 1, it is characterized in that comprising the following steps: by quartz sand, menaccanite and spodumene co-grinding, cross 150-200 mesh sieve and clinker, corn flour and spent pulping liquor mixed grind 30-50s, then be heated to 145-155 ℃, under stirring, add novolac resin, thermosetting phenolic resin, sesbania gum, gamma-aminopropyl-triethoxy-silane and dioctyl phthalate mixed grind 40-60s; Sand temperature drop during to 95-105 ℃, adds methenamine and ammonium benzoate mixed grind 10-15s, then adds boric acid, calcium stearate and composite powder mixed grind 25-35s; When sand temperature drop to 70 ℃ is following, unload sand, cooling, fragmentation, screening.
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Cited By (22)
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| CN104014716A (en) * | 2014-06-18 | 2014-09-03 | 承德北雁铸造材料有限公司 | Special precoated sand of engine cylinder block water jacket and preparation method of special precoated sand |
| CN104668442A (en) * | 2015-02-04 | 2015-06-03 | 繁昌县金科机电科技有限公司 | Pre-coated sand added with graphene and having rapid heat radiation effect 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 |
| CN104668443A (en) * | 2015-02-04 | 2015-06-03 | 繁昌县金科机电科技有限公司 | Casting precoated sand added with titanium dioxide and preparation method of casting precoated 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 |
| 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 |
| 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 |
| 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 |
| CN104841871A (en) * | 2015-05-07 | 2015-08-19 | 马鞍山市恒毅机械制造有限公司 | High-quality precoated sand for making core and preparation method thereof |
| CN104858356A (en) * | 2015-05-07 | 2015-08-26 | 马鞍山市恒毅机械制造有限公司 | Precoated sand for high-strength crack-resistant hot method and preparation method thereof |
| CN105215262A (en) * | 2015-10-08 | 2016-01-06 | 蚌埠冠宜型材科技有限公司 | A kind of environment-friendly type sandbinder |
| CN105903889A (en) * | 2016-05-26 | 2016-08-31 | 合肥市田源精铸有限公司 | Anti-adhesion precoated sand |
| CN106040963A (en) * | 2016-08-18 | 2016-10-26 | 江阴联华铸造有限公司 | Coated core sand for casting train steel casting and preparation method of coated core sand |
| CN106270367A (en) * | 2016-08-30 | 2017-01-04 | 山东莱芜润达新材料有限公司 | Precoated sand is with without ammonia phenolic resin and preparation method thereof |
| CN106552902A (en) * | 2017-01-13 | 2017-04-05 | 承德北雁铸造材料有限公司 | Efficient anti-vein type precoated sand and preparation method thereof |
| CN108057841A (en) * | 2017-12-29 | 2018-05-22 | 江门市双键实业有限公司 | A kind of water based paint of anti-casting vein and preparation method thereof |
| CN108580794A (en) * | 2018-03-30 | 2018-09-28 | 南通美莱达科技有限公司 | A kind of high-strength high temperature-resistant resistance to deformation type precoated sand and its processing technology |
| CN108746479A (en) * | 2018-09-03 | 2018-11-06 | 王韶华 | A kind of preparation method of the easy defeated and dispersed precoated sand of easy filling |
| 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 |
| CN110000328A (en) * | 2019-03-05 | 2019-07-12 | 宁夏共享化工有限公司 | A kind of casting anti-vein additive and preparation method thereof |
| CN112756559A (en) * | 2020-12-25 | 2021-05-07 | 合肥江淮铸造有限责任公司 | Sand core made of special precoated sand |
| CN113084080A (en) * | 2021-04-19 | 2021-07-09 | 河南伟业新材料有限公司 | Anti-vein agent for casting production |
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| CN104014716A (en) * | 2014-06-18 | 2014-09-03 | 承德北雁铸造材料有限公司 | Special precoated sand of engine cylinder block water jacket and preparation method of special precoated sand |
| CN104668442A (en) * | 2015-02-04 | 2015-06-03 | 繁昌县金科机电科技有限公司 | Pre-coated sand added with graphene and having rapid heat radiation effect 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 |
| CN104668443A (en) * | 2015-02-04 | 2015-06-03 | 繁昌县金科机电科技有限公司 | Casting precoated sand added with titanium dioxide and preparation method of casting precoated sand |
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| 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 |
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| CN104858356A (en) * | 2015-05-07 | 2015-08-26 | 马鞍山市恒毅机械制造有限公司 | Precoated sand for high-strength crack-resistant hot method and preparation method thereof |
| CN105215262A (en) * | 2015-10-08 | 2016-01-06 | 蚌埠冠宜型材科技有限公司 | A kind of environment-friendly type sandbinder |
| CN105903889A (en) * | 2016-05-26 | 2016-08-31 | 合肥市田源精铸有限公司 | Anti-adhesion precoated sand |
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| CN106270367A (en) * | 2016-08-30 | 2017-01-04 | 山东莱芜润达新材料有限公司 | Precoated sand is with without ammonia phenolic resin and preparation method thereof |
| CN106552902A (en) * | 2017-01-13 | 2017-04-05 | 承德北雁铸造材料有限公司 | Efficient anti-vein type precoated sand and preparation method thereof |
| CN106552902B (en) * | 2017-01-13 | 2019-01-18 | 承德北雁铸造材料有限公司 | Efficient anti-vein type precoated sand and preparation method thereof |
| CN108057841A (en) * | 2017-12-29 | 2018-05-22 | 江门市双键实业有限公司 | A kind of water based paint of anti-casting vein and preparation method thereof |
| CN108580794A (en) * | 2018-03-30 | 2018-09-28 | 南通美莱达科技有限公司 | A kind of high-strength high temperature-resistant resistance to deformation type precoated sand and its processing technology |
| 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 |
| CN108746479A (en) * | 2018-09-03 | 2018-11-06 | 王韶华 | A kind of preparation method of the easy defeated and dispersed precoated sand of easy filling |
| CN110000328A (en) * | 2019-03-05 | 2019-07-12 | 宁夏共享化工有限公司 | A kind of casting anti-vein additive and preparation method thereof |
| CN112756559A (en) * | 2020-12-25 | 2021-05-07 | 合肥江淮铸造有限责任公司 | Sand core made of special precoated sand |
| CN113084080A (en) * | 2021-04-19 | 2021-07-09 | 河南伟业新材料有限公司 | Anti-vein agent for casting production |
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