CN104690211A - Fast-cured precoated sand for hot method and preparation method thereof - Google Patents
Fast-cured precoated sand for hot method and preparation method thereof Download PDFInfo
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- CN104690211A CN104690211A CN201510057958.9A CN201510057958A CN104690211A CN 104690211 A CN104690211 A CN 104690211A CN 201510057958 A CN201510057958 A CN 201510057958A CN 104690211 A CN104690211 A CN 104690211A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions 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
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- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses fast-cured precoated sand for a hot method. The precoated sand is characterized by comprising the following components in parts by weight: 70-78 parts of silica sand, 0.3-0.6 part of monopotassium phosphate, 1-2 parts of ferrous sulfate, 4-6 parts of thermoplastic phenolic resin, 0.7-1 part of urotropin, 0.2-0.35 part of calcium stearate, 3-4 parts of water, 3-4.5 parts of polypropylene chopped fiber, 18-21 parts of olivine sand and 5-7 parts of a synergist; the formula of the precoated sand is simple and reasonable, a special process is added to prepare the synergist on the basis of a traditional formula, the mobility, breathability, heat dispersion and strength of the precoated sand are improved, and the surface is compact and is unlikely to crack and deform; the polypropylene chopped fiber and other components for improving tenacity are added, and ferrous sulfate and monopotassium phosphate are added in the product, so that fast hardening is promoted, and thus the strength of the precoated sand is improved; the preparation method has the beneficial effects of high strength, high curing speed, good high-temperature resistance and good heat cracking resistance.
Description
Technical field
The present invention relates to molding sand technical field, particularly a kind of hot method precoated sand and preparation method thereof of quick solidifying.
Background technology
Precoated sand not only may be used for metal mold gravity casting and low pressure casting, also may be used for Sand-Faced Metal Mould Casting, can also be used for hot method centrifugal casting; Not only may be used for producing ferrous castings, can also for the production of non-ferrous casting.Now, precoated sand has been widely used in the industries such as automobile, tractor, diesel engine, lathe, hydraulic part and pump class, can meet the production requirement of many complex precise foundry goods.Along with the development of shell process, require more and more higher to the phenolic resins used, the features such as the precoated sand intensity not only requiring phenolic resins to prepare is high, but also will possess quick solidifying, and high temperature hot-cracking resistance is good.
By research, the present invention is on the formula basis of traditional sand in coating phenolic resin, 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 present invention also added the composition that polypropylene chopped strand etc. strengthens toughness in formula, and ferrous sulfate, potassium dihydrogen phosphate etc. add in product, can promote quick-hardening, thus improves the intensity of precoated sand.The precoated sand that the present invention makes is used for making core, and to have coremaking process simple, and production efficiency is high, and sclerous reaction is fast, and be out of shape little, precision is high, and core can not produce creep, the feature such as can to use for a long time, be widely used in steel-casting, ironcasting.
Summary of the invention
Hot method precoated sand that the object of this invention is to provide a kind of quick solidifying and preparation method thereof.
In order to realize object of the present invention, the present invention is by following scheme implementation:
A hot method precoated sand for quick solidifying, is made up of the raw material of following weight portion: quartz sand 70-78, potassium dihydrogen phosphate 0.3-0.6, ferrous sulfate 1-2, novolac resin 4-6, methenamine 0.7-1, calcium stearate 0.2-0.35, water 3-4, polypropylene chopped strand 3-4.5, olivine sand 18-21, 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 hot method precoated sand of a kind of quick solidifying of the present invention, be made up of following concrete steps:
(1) quartz sand, polypropylene chopped strand, olivine sand 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 methenamine, potassium dihydrogen phosphate, the water-soluble formation mixed liquor of ferrous sulfate, then slowly join 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 fills a prescription advantages of simple, and on conventional formulation basis, with the addition of special process and make synergist, enhance the mobility of precoated sand, gas permeability, thermal diffusivity and intensity, surface compact is craze and transfiguration not easily; Also added the composition that polypropylene chopped strand etc. strengthens toughness, and ferrous sulfate, potassium dihydrogen phosphate etc. add in product, can promote quick-hardening to, thus improve the intensity of precoated sand; It is high that the present invention can reach intensity, quick solidifying, the effect that high temperature heat crack resistance is good.
Detailed description of the invention
Below by instantiation, the present invention is described in detail.
A hot method precoated sand for quick solidifying, is made up of the raw material of following weight portion (kilogram): quartz sand 70, potassium dihydrogen phosphate 0.3, ferrous sulfate 1, novolac resin 4, methenamine 0.7, calcium stearate 0.2, water 3, polypropylene chopped strand 3, olivine sand 18, 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 hot method precoated sand of a kind of quick solidifying of the present invention, be made up of following concrete steps:
(1) quartz sand, polypropylene chopped strand, olivine sand 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 methenamine, potassium dihydrogen phosphate, the water-soluble formation mixed liquor of ferrous sulfate, then slowly join 70% of mixed liquor in puddle mixer, continue hot lower mixed grind after 80 seconds, then add the mixed liquor of surplus, continue 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 5.8MPa, and hot bending strength is 2.4MPa, burning decrement 3.1%, and fusing point is 97 DEG C.
Claims (2)
1. the hot method precoated sand of a quick solidifying, it is characterized in that, be made up of the raw material of following weight portion: quartz sand 70-78, potassium dihydrogen phosphate 0.3-0.6, ferrous sulfate 1-2, novolac resin 4-6, methenamine 0.7-1, calcium stearate 0.2-0.35, water 3-4, polypropylene chopped strand 3-4.5, olivine sand 18-21, 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. the hot method precoated sand of a kind of quick solidifying according to claim 1, is characterized in that, be made up of following concrete steps:
(1) quartz sand, polypropylene chopped strand, olivine sand 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 methenamine, potassium dihydrogen phosphate, the water-soluble formation mixed liquor of ferrous sulfate, then slowly join 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510057958.9A CN104690211A (en) | 2015-02-04 | 2015-02-04 | Fast-cured precoated sand for hot method and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510057958.9A CN104690211A (en) | 2015-02-04 | 2015-02-04 | Fast-cured precoated sand for hot method and preparation method thereof |
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| CN104690211A true CN104690211A (en) | 2015-06-10 |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA756161A (en) * | 1967-04-04 | A. Boller Robert | Foundry binder process utilizing complementary sand mixes | |
| JPS5554236A (en) * | 1978-10-12 | 1980-04-21 | Sintokogio Ltd | Resin-coated sand for core making and core making method using this resin-coated sand |
| US4460629A (en) * | 1981-05-21 | 1984-07-17 | Toyota Jidosha Kogyo Kabushiki Kaisha | Process for preparation of resin-coated molding sand |
| CN1385264A (en) * | 2001-05-14 | 2002-12-18 | 山东莱芜树脂厂 | Casting film-covered sandy clay/phenolic resin nano compound, productive method nad use thereof |
| CN1640981A (en) * | 2004-01-16 | 2005-07-20 | 北京仁创制造技术研究院 | Cladded quartz sand fracturing support agent for oil production |
| CN102899019A (en) * | 2012-11-01 | 2013-01-30 | 宜兴市腾飞陶粒制造有限公司 | Propping agent for resin coating film and preparation method thereof |
| CN103194205A (en) * | 2013-04-12 | 2013-07-10 | 中国石油天然气股份有限公司 | Heat-resistant high-strength precoated sand fracturing propping agent and preparation method thereof |
| CN103567362A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Pre-coated sand with high strength and low gas evolution rate and preparation method thereof |
| CN103586397A (en) * | 2013-11-27 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Casting sand for casting stainless steel end enclosure |
| CN103951932A (en) * | 2014-05-12 | 2014-07-30 | 山东圣泉化工股份有限公司 | Phenol-formaldehyde resin composition for coated sand and preparation method thereof |
| CN104014720A (en) * | 2014-05-09 | 2014-09-03 | 方学军 | Quartz sand/fire clay composite alcohol group casting coating and preparation method thereof |
| 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 |
| CN104277821A (en) * | 2014-08-13 | 2015-01-14 | 中国地质大学（武汉） | Preparation method of oleophilic hydrophobic coated proppant |
-
2015
- 2015-02-04 CN CN201510057958.9A patent/CN104690211A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA756161A (en) * | 1967-04-04 | A. Boller Robert | Foundry binder process utilizing complementary sand mixes | |
| JPS5554236A (en) * | 1978-10-12 | 1980-04-21 | Sintokogio Ltd | Resin-coated sand for core making and core making method using this resin-coated sand |
| US4460629A (en) * | 1981-05-21 | 1984-07-17 | Toyota Jidosha Kogyo Kabushiki Kaisha | Process for preparation of resin-coated molding sand |
| CN1385264A (en) * | 2001-05-14 | 2002-12-18 | 山东莱芜树脂厂 | Casting film-covered sandy clay/phenolic resin nano compound, productive method nad use thereof |
| CN1640981A (en) * | 2004-01-16 | 2005-07-20 | 北京仁创制造技术研究院 | Cladded quartz sand fracturing support agent for oil production |
| CN102899019A (en) * | 2012-11-01 | 2013-01-30 | 宜兴市腾飞陶粒制造有限公司 | Propping agent for resin coating film and preparation method thereof |
| CN103194205A (en) * | 2013-04-12 | 2013-07-10 | 中国石油天然气股份有限公司 | Heat-resistant high-strength precoated sand fracturing propping agent and preparation method thereof |
| CN103567362A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Pre-coated sand with high strength and low gas evolution rate and preparation method thereof |
| CN103586397A (en) * | 2013-11-27 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Casting sand for casting stainless steel end enclosure |
| CN104014720A (en) * | 2014-05-09 | 2014-09-03 | 方学军 | Quartz sand/fire clay composite alcohol group casting coating and preparation method thereof |
| CN103951932A (en) * | 2014-05-12 | 2014-07-30 | 山东圣泉化工股份有限公司 | Phenol-formaldehyde resin composition for coated sand and preparation method thereof |
| 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 |
| CN104277821A (en) * | 2014-08-13 | 2015-01-14 | 中国地质大学（武汉） | Preparation method of oleophilic hydrophobic coated proppant |
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Application publication date: 20150610 |