CN106391994A - High-bonding force water-based EPC paint for magnesium alloy casting and preparation method thereof - Google Patents
High-bonding force water-based EPC paint for magnesium alloy casting and preparation method thereof Download PDFInfo
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- CN106391994A CN106391994A CN201610273355.7A CN201610273355A CN106391994A CN 106391994 A CN106391994 A CN 106391994A CN 201610273355 A CN201610273355 A CN 201610273355A CN 106391994 A CN106391994 A CN 106391994A
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- magnesium alloy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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Abstract
The invention discloses high-bonding force water-based EPC paint for magnesium alloy casting. The high-bonding force water-based EPC paint is prepared from the following raw materials in parts by weight: 40 to 50 parts of quartz powder, 10 to 20 parts of heat-conducting modified kieselguhr, 2 to 3 parts of nano zinc oxide, 2 to 3 parts of sodium alginate, 2 to 5 parts of tetraethyl orthosilicate, 3 to 5 parts of calcium sulfate whiskers, 0.1 to 0.2 part of sodium fluorosilicate, 0.1 to 0.2 part of zinc borate, 0.1 to 0.2 part of sodium lignin sulfonate, 20 to 30 parts of absolute ethyl alcohol, 30 to 50 parts of deionized water, and 5 to 10 parts of a diluted hydrochloric acid solution of which the concentration is 15 to 20%. According to the invention, a prepared paint coating has the advantages of breathability, thermal conductivity and environmental protection, defects of magnesium alloy castings can be effectively improved, and the quality of the magnesium alloy castings is improved.
Description
Technical field
The present invention relates to lost foam casting coating technical field, more particularly, to a kind of magnesium alloy cast water base lost foam paint of high bonding force and preparation method thereof.
Background technology
In recent years, magnesium alloy relies on its excellent combination property just progressively replacing part iron and steel, become the more and more extensive material of application, in automobile, the application in the fields such as aviation is especially prominent, and evaporative pattern casting magnesium alloy foundry goods is also noticeable research direction, using Technology of EPC, there is process is simple, casting dimension accuracy is high, the advantages of allowance little grade, relatively low yet with pouring temperature during the lost foam casting of Mg alloy castings, evaporative pattern gasification is more difficult, evaporative pattern is in a liquid state more, and magnesium metalline is active, easily oxidizing fire, ultimately result in foundry goods and hole occurs, the defects such as oxidation elephant skin, lead to its poor mechanical property, using being restricted.
In lost foam casting process, lost foam paint plays the effect of key, it is that lost foam casting obtains the requisite auxiliary material of premium casting, the properties such as its gas permeability, strength of coating, rheological characteristic all will produce vital impact to cast article, the coating selecting function admirable can effectively reduce the casting flaw of Mg alloy castings, and preferable coating should possess good gas permeability, wellability, adsorptivity and anti-oxidant, fire-retardant etc. and other effects.《The development of silica flour evaporative pattern casting magnesium alloy coating》One literary composition is using silica flour, diatomite as refractory aggregate, sodium bentonite, CMC are as suspending agent, dextrin and Ludox have prepared the magnesium alloy evaporative-pattern die coating material with highly-breathable and flame retardant effect as bonding agent, but the coating poor thermal conductivity being formed in this coating casting process, die cavity interior temperature is led to spend height, flame retardant effect is undesirable, and a large amount of combustion oxidations of magnesium metal lead to foundry goods major defect.
Content of the invention
The object of the invention is exactly the defect in order to make up prior art, provides water base lost foam paint of the high bonding force of a kind of magnesium alloy cast and preparation method thereof.
The present invention is achieved by the following technical solutions:
A kind of magnesium alloy cast is with the water base lost foam paint of high bonding force it is characterised in that this coating is made up of the raw material of following weight portion:Silica flour 40-50, heat conduction modification infusorial earth 10-20, nano zine oxide 2-3, sodium alginate 2-3, tetraethyl orthosilicate 2-5, calcium sulfate crystal whiskers 3-5, prodan 0.1-0.2, Firebrake ZB 0.1-0.2, sodium lignin sulfonate 0.1-0.2, absolute ethyl alcohol 20-30, deionized water 30-50, concentration are the dilute hydrochloric acid solution 5-10 of 15-20%.
Described heat conduction modification infusorial earth is obtained by following methods:
(1)First diatomite is pulverized after removal of impurities, cross 200-300 mesh sieve, sieving is standby;
(2)Aluminium isopropoxide is mixed with deionized water, heating water bath is to 80-90 DEG C, solution ultrasonic agitation mixes 2-3h, the salpeter solution that appropriate concentration is 2mol/L is added after solution ph no longer changes, regulation solution ph is 4-5, then raise temperature to 95-100 DEG C, after continuing stirring mixing 1-2h, add step(1)The material obtaining, is heated to 500-600 DEG C, under vacuum roasting 2-3h after being uniformly mixed, take out, obtain final product heat conduction modification infusorial earth after subsequently naturally cooling to room temperature.
Described step(2)Middle aluminium isopropoxide, diatomite, the weight of deionized water are than for 1:10:10-20.
A kind of described magnesium alloy cast with the preparation method of the water base lost foam paint of high bonding force is:First sodium alginate, sodium lignin sulfonate, nano zine oxide, calcium sulfate crystal whiskers and absolute ethyl alcohol, deionized water mixed grinding are disperseed 30-50min, it is subsequently added tetraethyl orthosilicate, dilute hydrochloric acid solution is dripped after stirring reaction 20-30min, add other leftover materials after hybrid reaction 40-50min after completion of dropwise addition, after mixed grinding dispersion 2-3h, obtain final product this water based paint.
The lost foam paint of present invention preparation possesses excellent high temperature bonding ability, coating can be made to remain to keep good mechanical property and structural form under the high temperature conditions, prevent foundry goods scab, reduction type cavity temperature that simultaneously can also be suitable, improve magnesium metal oxidation combustion phenomena, the paint coatings that this invention prepares have the advantages that ventilative, heat conduction, environmental protection, can effectively improve Mg alloy castings defect, improve Mg alloy castings quality.
Specific embodiment
A kind of magnesium alloy cast is with the water base lost foam paint of high bonding force it is characterised in that this coating is made up of the raw material of following weight portion:Silica flour 40, heat conduction modification infusorial earth 10, nano zine oxide 2, sodium alginate 2, tetraethyl orthosilicate 2, calcium sulfate crystal whiskers 3, prodan 0.1, Firebrake ZB 0.1, sodium lignin sulfonate 0.1, absolute ethyl alcohol 20, deionized water 30, concentration are 15% dilute hydrochloric acid solution 5.
Wherein heat conduction modification infusorial earth is obtained by following methods:
(1)First diatomite is pulverized after removal of impurities, cross 200 mesh sieves, sieving is standby;
(2)Aluminium isopropoxide is mixed with deionized water, to 80 DEG C, solution ultrasonic agitation mixes 2h to heating water bath, the salpeter solution that appropriate concentration is 2mol/L is added after solution ph no longer changes, adjusting solution ph is 4, then raises temperature to 95 DEG C, adds step after continuing stirring mixing 1h(1)The material obtaining, is heated to 500 DEG C, under vacuum roasting 2h after being uniformly mixed, take out, obtain final product heat conduction modification infusorial earth after subsequently naturally cooling to room temperature.
Wherein step(2)Middle aluminium isopropoxide, diatomite, the weight of deionized water are than for 1:10:10.
The preparation method of this coating is:First sodium alginate, sodium lignin sulfonate, nano zine oxide, calcium sulfate crystal whiskers and absolute ethyl alcohol, deionized water mixed grinding are disperseed 30min, it is subsequently added tetraethyl orthosilicate, dilute hydrochloric acid solution is dripped after stirring reaction 20min, add other leftover materials after hybrid reaction 40min after completion of dropwise addition, after mixed grinding dispersion 2h, obtain final product this water based paint.
The coating property test result obtaining is:
Density:1.48g/mm3;Suspensibility:98%;Viscosity:89mP.s;Thixotroping rate:16%;Gas permeability:25.4cm2.(KPa.min)-1;Strength of coating:1128g/mm;Thermal conductivity factor:0.42W/(m.k).
It is squeegeed onto forming, on foam plastic sample surface, the dope layer that thickness is 0.5mm, subsequent drying carries out magnesium alloy member cast after processing, the Mg alloy castings any surface finish obtaining, surface roughness≤Ra12.5 μm, non-oxidation elephant skin phenomenon.
Claims (4)
1. a kind of magnesium alloy cast with the water base lost foam paint of high bonding force it is characterised in that this coating is made up of the raw material of following weight portion:Silica flour 40-50, heat conduction modification infusorial earth 10-20, nano zine oxide 2-3, sodium alginate 2-3, tetraethyl orthosilicate 2-5, calcium sulfate crystal whiskers 3-5, prodan 0.1-0.2, Firebrake ZB 0.1-0.2, sodium lignin sulfonate 0.1-0.2, absolute ethyl alcohol 20-30, deionized water 30-50, concentration are the dilute hydrochloric acid solution 5-10 of 15-20%.
2. as claimed in claim 1 a kind of magnesium alloy cast with the water base lost foam paint of high bonding force it is characterised in that described heat conduction modification infusorial earth is obtained by following methods:
(1)First diatomite is pulverized after removal of impurities, cross 200-300 mesh sieve, sieving is standby;
(2)Aluminium isopropoxide is mixed with deionized water, heating water bath is to 80-90 DEG C, solution ultrasonic agitation mixes 2-3h, the salpeter solution that appropriate concentration is 2mol/L is added after solution ph no longer changes, regulation solution ph is 4-5, then raise temperature to 95-100 DEG C, after continuing stirring mixing 1-2h, add step(1)The material obtaining, is heated to 500-600 DEG C, under vacuum roasting 2-3h after being uniformly mixed, take out, obtain final product heat conduction modification infusorial earth after subsequently naturally cooling to room temperature.
3. as claimed in claim 2 a kind of magnesium alloy cast with the water base lost foam paint of high bonding force it is characterised in that described step(2)Middle aluminium isopropoxide, diatomite, the weight of deionized water are than for 1:10:10-20.
4. as claimed in claim 1 a kind of magnesium alloy cast preparation method of the water base lost foam paint of high bonding force it is characterised in that described preparation method is:First sodium alginate, sodium lignin sulfonate, nano zine oxide, calcium sulfate crystal whiskers and absolute ethyl alcohol, deionized water mixed grinding are disperseed 30-50min, it is subsequently added tetraethyl orthosilicate, dilute hydrochloric acid solution is dripped after stirring reaction 20-30min, add other leftover materials after hybrid reaction 40-50min after completion of dropwise addition, after mixed grinding dispersion 2-3h, obtain final product this water based paint.
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CN201610273355.7A CN106391994A (en) | 2016-04-27 | 2016-04-27 | High-bonding force water-based EPC paint for magnesium alloy casting and preparation method thereof |
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Citations (7)
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CN102787253A (en) * | 2012-07-26 | 2012-11-21 | 西安理工大学 | Preparation method for SiC and graphite hybrid reinforced copper-based surface composite material |
CN103100655A (en) * | 2012-12-11 | 2013-05-15 | 芜湖恒坤汽车部件有限公司 | Method for preparing solid-mold casting coating material |
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CN104496497A (en) * | 2014-12-15 | 2015-04-08 | 滁州金诺实业有限公司 | Heat-insulation fireproof coating applied to pre-buried pipe of vacuum cast aluminium alloy casting |
CN105057569A (en) * | 2015-07-27 | 2015-11-18 | 明光市留香泵业有限公司 | Water-based paint containing nano-zinc oxide and with enhanced high heat retaining property for evanescent mold casting and preparation method thereof |
CN105149499A (en) * | 2015-09-25 | 2015-12-16 | 张燕 | High-aluminum blast furnace slag-boric sludge expendable pattern casting coating and preparing method thereof |
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2016
- 2016-04-27 CN CN201610273355.7A patent/CN106391994A/en active Pending
Patent Citations (7)
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CN102787253A (en) * | 2012-07-26 | 2012-11-21 | 西安理工大学 | Preparation method for SiC and graphite hybrid reinforced copper-based surface composite material |
CN103100655A (en) * | 2012-12-11 | 2013-05-15 | 芜湖恒坤汽车部件有限公司 | Method for preparing solid-mold casting coating material |
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CN104496497A (en) * | 2014-12-15 | 2015-04-08 | 滁州金诺实业有限公司 | Heat-insulation fireproof coating applied to pre-buried pipe of vacuum cast aluminium alloy casting |
CN105057569A (en) * | 2015-07-27 | 2015-11-18 | 明光市留香泵业有限公司 | Water-based paint containing nano-zinc oxide and with enhanced high heat retaining property for evanescent mold casting and preparation method thereof |
CN105149499A (en) * | 2015-09-25 | 2015-12-16 | 张燕 | High-aluminum blast furnace slag-boric sludge expendable pattern casting coating and preparing method thereof |
CN105170891A (en) * | 2015-09-25 | 2015-12-23 | 张燕 | High-aluminum blast furnace slag-coal ash lost foam casting paint and preparation method thereof |
Non-Patent Citations (2)
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刘姝抒 等: "硅藻精土酸浸-煅烧真增白工艺与性能表征", 《非金属矿》 * |
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