CN110918869A - High-temperature-resistant coating for resin sand casting and preparation method thereof - Google Patents
High-temperature-resistant coating for resin sand casting and preparation method thereof Download PDFInfo
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- CN110918869A CN110918869A CN201911114643.8A CN201911114643A CN110918869A CN 110918869 A CN110918869 A CN 110918869A CN 201911114643 A CN201911114643 A CN 201911114643A CN 110918869 A CN110918869 A CN 110918869A
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- 238000000576 coating method Methods 0.000 title claims abstract description 125
- 239000011248 coating agent Substances 0.000 title claims abstract description 110
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 229920005989 resin Polymers 0.000 title claims abstract description 22
- 239000011347 resin Substances 0.000 title claims abstract description 22
- 238000007528 sand casting Methods 0.000 title claims description 19
- 239000000843 powder Substances 0.000 claims abstract description 142
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical class O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 139
- 229910052622 kaolinite Inorganic materials 0.000 claims abstract description 77
- 239000004576 sand Substances 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000005266 casting Methods 0.000 claims abstract description 27
- 239000000375 suspending agent Substances 0.000 claims abstract description 25
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 22
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 22
- 239000011230 binding agent Substances 0.000 claims abstract description 20
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 18
- 229920000168 Microcrystalline cellulose Polymers 0.000 claims abstract description 14
- 235000019813 microcrystalline cellulose Nutrition 0.000 claims abstract description 14
- 239000008108 microcrystalline cellulose Substances 0.000 claims abstract description 14
- 229940016286 microcrystalline cellulose Drugs 0.000 claims abstract description 14
- 229920001353 Dextrin Polymers 0.000 claims abstract description 12
- 239000004375 Dextrin Substances 0.000 claims abstract description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000440 bentonite Substances 0.000 claims abstract description 12
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 12
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 12
- 235000019425 dextrin Nutrition 0.000 claims abstract description 12
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 12
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims abstract description 12
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims abstract description 12
- 229910052580 B4C Inorganic materials 0.000 claims abstract description 10
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052845 zircon Inorganic materials 0.000 claims abstract description 10
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 52
- 238000003756 stirring Methods 0.000 claims description 35
- 229910052742 iron Inorganic materials 0.000 claims description 26
- 229910052749 magnesium Inorganic materials 0.000 claims description 24
- 239000011777 magnesium Substances 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 24
- 239000000725 suspension Substances 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 22
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 20
- 238000007873 sieving Methods 0.000 claims description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- 238000001354 calcination Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 12
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical class [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- ULUAUXLGCMPNKK-UHFFFAOYSA-N Sulfobutanedioic acid Chemical compound OC(=O)CC(C(O)=O)S(O)(=O)=O ULUAUXLGCMPNKK-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 10
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 10
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 10
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 10
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 10
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 10
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 9
- XEGMDUOAESTQCC-UHFFFAOYSA-N 1-(naphthalen-1-ylmethyl)naphthalene;sodium Chemical compound [Na].C1=CC=C2C(CC=3C4=CC=CC=C4C=CC=3)=CC=CC2=C1 XEGMDUOAESTQCC-UHFFFAOYSA-N 0.000 claims description 8
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 8
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 6
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 6
- -1 polydimethylsiloxane Polymers 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 abstract description 13
- 239000000203 mixture Substances 0.000 abstract description 4
- CBECDWUDYQOTSW-UHFFFAOYSA-N 2-ethylbut-3-enal Chemical compound CCC(C=C)C=O CBECDWUDYQOTSW-UHFFFAOYSA-N 0.000 abstract 1
- JTHNLKXLWOXOQK-UHFFFAOYSA-N n-propyl vinyl ketone Natural products CCCC(=O)C=C JTHNLKXLWOXOQK-UHFFFAOYSA-N 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 62
- 230000000052 comparative effect Effects 0.000 description 22
- 239000002245 particle Substances 0.000 description 15
- 230000000149 penetrating effect Effects 0.000 description 12
- 239000000853 adhesive Substances 0.000 description 11
- 230000001070 adhesive effect Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000007790 scraping Methods 0.000 description 5
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 150000002191 fatty alcohols Chemical class 0.000 description 4
- 229910052863 mullite Inorganic materials 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000003110 molding sand Substances 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000012778 molding material Substances 0.000 description 2
- LCRMGUFGEDUSOG-UHFFFAOYSA-N naphthalen-1-ylsulfonyloxymethyl naphthalene-1-sulfonate;sodium Chemical compound [Na].C1=CC=C2C(S(=O)(OCOS(=O)(=O)C=3C4=CC=CC=C4C=CC=3)=O)=CC=CC2=C1 LCRMGUFGEDUSOG-UHFFFAOYSA-N 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 238000007614 solvation Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Ceramic Products (AREA)
Abstract
本发明公开了一种树脂砂型铸造用耐高温涂料及其制备方法，涉及铸造涂料技术领域，其技术方案要点是一种树脂砂型铸造用耐高温涂料，包括如下组分：耐火骨料、粘结剂、悬浮剂、消泡剂以及水；所述耐火骨料由重量比为改性5:3:1:1的改性高岭石粉、煅烧高岭石粉、锆英粉、碳化硼粉混合而成；所述悬浮剂由重量比为3:1:1的锂基膨润土、微晶纤维素、聚丙烯酸钠混合而成；所述粘结剂由重量比为4:1的黄糊精、聚乙烯醇缩丁醛混合而成。本发明通过改性高岭石粉与煅烧高岭土、锆英粉、碳化硼与悬浮剂、粘结剂以及消泡剂的配合，得到悬浮性好、质量稳定的涂料；将其涂覆于砂型侧壁时，可以均匀附着于砂型侧壁，并且具有很好的高温粘结强度。The invention discloses a high temperature resistant coating for resin sand mold casting and a preparation method thereof, and relates to the technical field of foundry coatings. agent, suspending agent, defoaming agent and water; the refractory aggregate is mixed with modified kaolinite powder, calcined kaolinite powder, zircon powder and boron carbide powder whose weight ratio is modified 5:3:1:1. The suspending agent is composed of lithium bentonite, microcrystalline cellulose and sodium polyacrylate with a weight ratio of 3:1:1; the binder is composed of yellow dextrin, poly A mixture of vinyl butyral. In the present invention, a coating with good suspendability and stable quality is obtained by combining modified kaolinite powder with calcined kaolin, zircon powder, boron carbide, suspending agent, binder and defoaming agent; It can be evenly attached to the side wall of the sand mold, and has good high temperature bonding strength.
Description
Technical Field
The invention relates to the technical field of casting coatings, in particular to a high-temperature-resistant coating for resin sand casting and a preparation method thereof.
Background
The sand casting refers to a casting method for producing castings in sand molds, and is a main method for mainly producing castings at present; the material for manufacturing the sand mold is called as molding material, the material for manufacturing the sand mold is customarily called as molding sand, and the molding material for manufacturing the sand core is called as core sand; the sand casting can be divided into clay sand casting, sodium silicate sand casting and resin sand core casting by using the adhesive for the molding sand core; because the size precision of the cast made by the resin sand core is superior to that of other sand casting, the resin sand core casting is gradually replacing clay sand and sodium silicate sand.
In sand casting production, a layer of casting coating is coated on the surface of a core to prevent a casting from sand bonding so as to improve the surface smoothness of the casting; the casting coating is mainly composed of refractory aggregate, carrier liquid, suspending agent, binder and auxiliary agent, is used for covering the surface of a core, and can form a compact refractory coating on the surface of the core at the casting temperature, so that molten metal is prevented from permeating into a sand mold, gas generated by thermal decomposition in the molding sand is prevented from entering the molten metal, a casting with a smooth surface can be obtained, and the casting coating plays an important role in casting surface quality, resisting scouring of the molten metal on the sand mold, preventing sand sticking of the casting and the like. Most of the existing casting coatings are suspension liquid, the proportion of refractory aggregate is large, the high-temperature resistance of the casting coatings is directly influenced, but the suspension property of the casting coatings is deteriorated along with the increase of the refractory aggregate, when a sand mold is coated, the coatings need to be continuously stirred, when the coatings are coated on the side wall of the sand mold, the coatings have the tendency of moving downwards under the action of gravity before the coatings are solidified into a film, the coatings are locally accumulated, the proportion of a top coating and a bottom coating deviates from the original proportion, the adhesion of the coatings to the sand mold is reduced due to the uneven thickness of the coatings, the coatings are easy to fall off, and the surface quality of castings is influenced.
Disclosure of Invention
One of the purposes of the invention is to provide a high-temperature resistant coating for resin sand mold casting, which is prepared by matching modified kaolin powder, calcined kaolin, zircon powder, boron carbide, a suspending agent, a binder and a defoaming agent, and has good suspension property and stable quality; when the adhesive is coated on the side wall of the sand mold, the adhesive can be uniformly attached to the side wall of the sand mold and has good high-temperature bonding strength.
The technical purpose of the invention is realized by the following technical scheme:
the high-temperature-resistant coating for resin sand casting comprises the following components in parts by weight: 60-70 parts of refractory aggregate, 6-8 parts of binder, 3-5 parts of suspending agent, 1-2 parts of defoaming agent and 120 parts of 100-one water; the refractory aggregate is prepared by mixing modified kaolinite powder, calcined kaolinite powder, zircon powder and boron carbide powder in a weight ratio of modified 5:3:1: 1; the suspending agent is prepared by mixing 3:1:1 by weight of lithium bentonite, microcrystalline cellulose and sodium polyacrylate; the binder is prepared by mixing yellow dextrin and polyvinyl butyral according to a weight ratio of 4: 1.
By adopting the technical scheme, the coating with good suspension property and stable quality is obtained by matching the modified kaolin powder, the calcined kaolin, the zircon powder, the boron carbide, the suspending agent, the binder and the defoaming agent; when the adhesive is coated on the side wall of the sand mold, the adhesive can be uniformly attached to the side wall of the sand mold and has good high-temperature bonding strength.
The suspending agent is prepared by mixing inorganic lithium bentonite, organic microcrystalline cellulose and sodium polyacrylate, the sodium polyacrylate can disperse aggregate particles, the expansibility of the lithium bentonite in water can be utilized to increase the viscosity of the coating, a solvation film and a three-dimensional network structure are formed on the surfaces of the aggregate particles to support and organize the settlement of the aggregate particles, and the microcrystalline cellulose can be adsorbed on the surface film interfaces of the aggregate particles and reinforce the interface film to improve the suspensibility of the microcrystalline cellulose.
The viscosity and the bonding property of the coating can be improved by matching the yellow dextrin with the polyvinyl butyral, and the aggregate particles can be dispersed and suspended and are not easy to agglomerate or settle by matching the yellow dextrin with the suspending agent; when the coating is coated on a sand mold, aggregate particles in the coating can still be uniformly dispersed on the side wall of the sand mold, after the coating is cured to form a film, the proportion of the top coating and the bottom coating has smaller deviation from the original proportion, the coating thickness is uniform, and the coating has good high-temperature bonding strength on the side wall of the sand mold.
Further, the calcined kaolin powder is prepared by the following method: taking 60 parts of kaolinite and 10-15 parts of high-magnesium iron ore, and crushing and sieving the kaolinite and the high-magnesium iron ore to obtain kaolinite powder with the fineness of 80-100 meshes and high-magnesium iron ore powder; mixing kaolin powder and high-magnesium iron ore powder, adding 6-10 parts of water, stirring uniformly, standing for 1-2h, and removing supernatant to obtain solid matter; heating the solid to 400-500 ℃ for 1-2 h; then heating to 1200-1400 ℃, calcining for 8-10h, cooling, grinding and sieving to obtain calcined kaolin powder with the fineness of 200-400 meshes.
By adopting the technical scheme, the high-magnesium iron ore is iron ore containing higher magnesium oxide, the kaolinite is an aluminate material, when the kaolinite and the high-magnesium iron ore are calcined at the temperature of 1200-1400 ℃, the mullite reaction can be gradually carried out to obtain mullite and high-temperature quartz with high melting points, and the ferric oxide reacts with the silica at high temperature to improve the binding power among sand particles and improve the strength of the refractory aggregate; when the high-temperature-resistant epoxy resin is used as a refractory aggregate of a coating, the high-temperature-resistant epoxy resin has good high-temperature resistance.
Further, the heating rate is 10-20 ℃/min when the solid is heated to 400-500 ℃; the heating rate is 20-30 ℃/min when the temperature is increased from 400-500 ℃ to 1200-1400 ℃.
By adopting the technical scheme, the temperature is increased at the speed of 10-20 ℃/min during the initial calcination, so that the inside and the outside of the kaolinite can be uniformly heated, and the temperature is increased at a higher speed during the later calcination, so that the production efficiency can be improved.
① crushing and sieving the kaolinite to obtain kaolinite powder with the fineness of 80-100 meshes, calcining the kaolinite powder at the temperature of 600-700 ℃ for 3-5h, and cooling to obtain pretreated kaolinite powder for later use;
② adding 20-30 wt% of penetrant into the pretreated kaolin powder, stirring, standing at 40-50 deg.C for 20-30h, and heating at 120-180 deg.C for 1-2h to obtain modified kaolin powder.
By adopting the technical scheme, after calcination treatment, the activity of silicon atoms and aluminum atoms in the kaolinite is gradually increased, the porosity of the powder is increased, and the density is reduced; the contact area of the pretreated kaolinite powder and the penetrating agent is increased, the pretreated kaolinite powder can be uniformly suspended and dispersed in the coating through the cooperation of the pretreated kaolinite powder and the penetrating agent after being treated by the penetrating agent, and the phenomenon of precipitation of the pretreated kaolinite powder in storage can be further prevented due to the reduction of the density of the pretreated kaolinite powder; through the matching of the coating and the binder, the adhesive force of the coating to the sand mold can be increased, and the phenomena of cracking and falling of the coating are reduced.
Further, the penetrant is prepared by adopting the following method: taking 30-40 parts of water by weight, adding 5-10 parts of 20wt% hydrochloric acid solution, 1-2 parts of hydroxypropyl methyl cellulose, 1-2 parts of fatty alcohol-polyoxyethylene ether, 0.3-0.7 part of alcohol ether sulfo succinic acid monoester disodium salt and 0.1-0.3 part of methylene dinaphthalene sodium sulfonate, and uniformly stirring to obtain the penetrant.
By adopting the technical scheme, the penetrant is obtained by mixing hydroxypropyl methyl cellulose, fatty alcohol-polyoxyethylene ether, alcohol ether sulfosuccinic acid monoester disodium salt, methylene dinaphthalene sodium sulfonate and hydrochloric acid solution, can quickly permeate into and disperse in pores of pretreated kaolinite powder after being mixed with the pretreated kaolinite powder, and can be solidified on a rough interface of the kaolinite under the action of high temperature; when the modified kaolinite powder is used in the coating, the coating has good wetting property on the surface of a sand mold under the action of a penetrating agent, and the adhesive force of the coating on the surface of the sand mold is improved.
Further, the defoaming agent is polydimethylsiloxane.
By adopting the technical scheme, the polydimethylsiloxane serving as the defoaming agent of the coating can reduce the surface tension of the coating, prevent the formation of foam, is beneficial to improving the smoothness of the coating and can also play a role in suspending and dispersing aggregate particles in the coating.
The second purpose of the invention is to provide a preparation method of the high-temperature resistant coating for resin sand mold casting.
The technical purpose of the invention is realized by the following technical scheme:
a preparation method of high-temperature resistant coating for resin sand casting comprises the following steps:
s1, taking 20 parts of water, 3-5 parts of suspending agent and 1-2 parts of defoaming agent by weight, stirring at a high speed for dispersing for 10-20min to obtain a suspension, and standing for 20-24 h;
and S2, adding 80-100 parts of water into the suspension, adding 6-8 parts of binder after stirring, adding 60-70 parts of refractory aggregate after stirring for 20-30min, and stirring for 30-40min to obtain the high-temperature-resistant coating.
Further, the stirring speed in S1 was 1000-1200 r/min.
By adopting the technical scheme, the suspending agent can be uniformly dispersed in the water by stirring at the speed of 1000-1200 r/min.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. the coating with good suspension property and stable quality is obtained by matching the modified kaolin powder, the calcined kaolin, the zircon powder, the boron carbide, the suspending agent, the binder and the defoaming agent; when the coating is coated on the side wall of the sand mold, the coating can be uniformly attached to the side wall of the sand mold and has good adhesive force; the suspending agent is prepared by mixing inorganic lithium bentonite, organic microcrystalline cellulose and sodium polyacrylate, the sodium polyacrylate can disperse aggregate particles, the expansibility of the lithium bentonite in water can be utilized to increase the viscosity of the coating, a solvation film and a three-dimensional network structure are formed on the surfaces of the aggregate particles to support and organize the settlement of the aggregate particles, and the microcrystalline cellulose can be adsorbed on the surface film interfaces of the aggregate particles and reinforce the interface film to improve the suspension property of the microcrystalline cellulose; the viscosity and the bonding property of the coating can be improved by matching the yellow dextrin with the polyvinyl butyral, and the aggregate particles can be dispersed and suspended and are not easy to agglomerate or settle by matching the yellow dextrin with the suspending agent; when the coating is coated on a sand mold, aggregate particles in the coating can still be uniformly dispersed on the side wall of the sand mold, after the coating is cured to form a film, the ratio of the top coating to the bottom coating has smaller deviation from the original ratio, the thickness of the coating is uniform, and the coating has good adhesive force to the side wall of the sand mold;
2. the high-magnesium iron ore is iron ore with higher magnesium oxide, the kaolinite is aluminate material, when the kaolinite and the high-magnesium iron ore are calcined at the temperature of 1200-1400 ℃, the mullite reaction can be gradually carried out to obtain mullite with high melting point and high-temperature quartz, and the ferric oxide reacts with the silicon dioxide at high temperature to improve the binding power among sand particles and improve the strength of the refractory aggregate; when the high-temperature-resistant epoxy resin is used as a refractory aggregate of a coating, the high-temperature-resistant epoxy resin has good high-temperature resistance;
3. after calcination treatment, the activity of silicon atoms and aluminum atoms in the kaolinite is gradually increased, the porosity of the powder is increased, and the density is reduced; the contact area of the pretreated kaolinite powder and the penetrating agent is increased, the pretreated kaolinite powder can be uniformly suspended and dispersed in the coating through the cooperation of the pretreated kaolinite powder and the penetrating agent after being treated by the penetrating agent, and the phenomenon of precipitation of the pretreated kaolinite powder in storage can be further prevented due to the reduction of the density of the pretreated kaolinite powder; the adhesion force of the coating to a sand mold can be increased through the matching of the coating and a binder, and the phenomena of cracking and falling of the coating are reduced;
4. the penetrant is obtained by mixing hydroxypropyl methyl cellulose, fatty alcohol-polyoxyethylene ether, alcohol ether sulfo succinic acid monoester disodium salt, methylene dinaphthalene sodium sulfonate and hydrochloric acid solution, can quickly permeate into and disperse in pores of pretreated kaolinite powder after being mixed with the pretreated kaolinite powder, and can be solidified on a rough interface of the kaolinite under the action of high temperature; when the modified kaolinite powder is used in the coating, the coating has good wetting property on the surface of a sand mold under the action of a penetrating agent, and the adhesive force of the coating on the surface of the sand mold is improved.
Detailed Description
The present invention will be described in further detail below.
Preparation example of calcined Kaolin powder
Preparation example 1 of calcined kaolinite powder: taking 60kg of kaolinite and 10kg of high-magnesium iron ore, crushing and sieving the kaolinite and the high-magnesium iron ore to obtain kaolinite powder and high-magnesium iron ore powder with the fineness of 80-100 meshes; mixing kaolin powder and high-magnesium iron ore powder, adding 6kg of water, uniformly stirring, standing for 1h, and removing supernatant to obtain a solid matter; heating the solid matter to 400 ℃ at the speed of 10 ℃/min, and heating for 1 h; then heating to 1200 ℃ at the speed of 20 ℃/min, calcining for 8h, cooling, grinding and sieving to obtain calcined kaolin powder with the fineness of 200-400 meshes.
Preparation example 2 of calcined kaolinite powder: taking 60kg of kaolinite and 12.5kg of high-magnesium iron ore, crushing and sieving the kaolinite and the high-magnesium iron ore to obtain kaolinite powder and high-magnesium iron ore powder with the fineness of 80-100 meshes; mixing kaolin powder and high-magnesium iron ore powder, adding 8kg of water, uniformly stirring, standing for 1.5h, and removing supernatant to obtain a solid matter; heating the solid matter to 450 ℃ at the speed of 15 ℃/min, and heating for 1.5 h; then heating to 1300 ℃ at the speed of 25 ℃/min, calcining for 9h, cooling, grinding and sieving to obtain calcined kaolin powder with the fineness of 200-400 meshes.
Preparation example 3 of calcined kaolinite powder: taking 60kg of kaolinite and 15kg of high-magnesium iron ore, crushing and sieving the kaolinite and the high-magnesium iron ore to obtain kaolinite powder and high-magnesium iron ore powder with the fineness of 80-100 meshes; mixing kaolin powder and high-magnesium iron ore powder, adding 10kg of water, uniformly stirring, standing for 2h, and removing supernatant to obtain a solid matter; heating the solid matter to 500 ℃ at the speed of 20 ℃/min for 2 h; then heating to 1400 ℃ at the speed of 30 ℃/min, calcining for 10h, cooling, grinding and sieving to obtain calcined kaolin powder with the fineness of 200-400 meshes.
Second, preparation example of modified Kaolin powder
① kg of water is taken, 5kg of 20wt% hydrochloric acid solution, 1kg of hydroxypropyl methyl cellulose, 1kg of fatty alcohol-polyoxyethylene ether, 0.3kg of alcohol ether sulfosuccinic acid monoester disodium salt and 0.1kg of methylene dinaphthalene sodium sulfonate are added into the water, and the mixture is uniformly stirred to obtain the penetrant;
② pulverizing and sieving kaolinite to obtain kaolinite powder with fineness of 80-100 meshes, calcining kaolinite powder at 600 deg.C for 3 hr, and cooling to obtain pretreated kaolinite powder;
③ adding 20wt% of penetrating agent into the pretreated kaolin powder, stirring, standing at 40 deg.C for 20 hr, and heating at 120 deg.C for 1 hr to obtain modified kaolin powder.
① kg of water is taken, 7.5kg of 20wt% hydrochloric acid solution, 1.5kg of hydroxypropyl methyl cellulose, 1.5kg of fatty alcohol polyoxyethylene ether, 0.5kg of alcohol ether sulfo succinic acid monoester disodium salt and 0.2kg of methylene dinaphthalene sodium sulfonate are added into the water, and the mixture is uniformly stirred to obtain the penetrating agent;
② pulverizing and sieving kaolinite to obtain kaolinite powder with fineness of 80-100 meshes, calcining kaolinite powder at 650 deg.C for 4 hr, and cooling to obtain pretreated kaolinite powder;
③ adding penetrant accounting for 25% of the weight of the pretreated kaolin powder, stirring uniformly, standing for 25h at 45 ℃, and heating for 1.5h at 150 ℃ to obtain the modified kaolin powder.
① kg of water is taken, 10kg of 20wt% hydrochloric acid solution, 2kg of hydroxypropyl methyl cellulose, 2kg of fatty alcohol-polyoxyethylene ether, 0.7kg of alcohol ether sulfosuccinic acid monoester disodium salt and 0.3kg of methylene dinaphthalene sodium sulfonate are added into the water, and the mixture is uniformly stirred to obtain the penetrating agent;
② pulverizing and sieving kaolinite to obtain kaolinite powder with fineness of 80-100 meshes, calcining kaolinite powder at 700 deg.C for 5 hr, and cooling to obtain pretreated kaolinite powder;
③ adding 30 wt% of penetrant into the pretreated kaolinite powder, stirring, standing at 50 deg.C for 30 hr, and heating at 180 deg.C for 2 hr to obtain modified kaolinite powder.
Preparation example 4 of modified Kaolin powder this preparation example differs from preparation example 1 of modified Kaolin powder in that the penetrant in step ③ is replaced with an equal amount of deionized water.
Preparation example 4 of modified kaolinite powder: the difference between the preparation example and the preparation example 1 of the modified kaolin powder is that the penetrant does not contain hydroxypropyl methyl cellulose, fatty alcohol polyoxyethylene ether, disodium alcohol ether sulfosuccinate monoester and sodium methylene dinaphthalene sulfonate.
Third, example
Example 1: the high-temperature-resistant coating for resin sand mold casting is prepared by the following method:
s1, taking 20kg of water, 3kg of suspending agent and 1kg of defoaming agent, stirring and dispersing at a high speed of 1000r/min for 10min to obtain a suspension, and standing for 20 h;
s2, adding 80kg of water into the suspension, adding 6kg of binder after stirring, adding 60kg of refractory aggregate after stirring for 20min, and stirring for 30min to obtain the high-temperature-resistant coating;
wherein the refractory aggregate is prepared by mixing modified kaolinite powder (selected from preparation example 1 of modified kaolinite powder), calcined kaolinite powder (selected from preparation example 1 of calcined kaolinite powder), zircon powder and boron carbide powder in a weight ratio of 5:3:1: 1; the suspending agent is prepared by mixing 3:1:1 weight ratio of lithium bentonite, microcrystalline cellulose and sodium polyacrylate; the binder is formed by mixing yellow dextrin and polyvinyl butyral according to the weight ratio of 4: 1; the defoaming agent is polydimethylsiloxane.
Example 2: the high-temperature-resistant coating for resin sand mold casting is prepared by the following method:
s1, taking 20kg of water, 4kg of suspending agent and 1.5kg of defoaming agent, stirring and dispersing at a high speed of 1100r/min for 15min to obtain a suspension, and standing for 20-24 h;
s2, adding 90kg of water into the suspension, adding 7kg of binder after stirring, adding 65kg of refractory aggregate after stirring for 25min, and stirring for 35min to obtain the high-temperature-resistant coating;
wherein the refractory aggregate is prepared by mixing modified kaolinite powder (selected from preparation example 2 of modified kaolinite powder), calcined kaolinite powder (selected from preparation example 2 of calcined kaolinite powder), zircon powder and boron carbide powder in a weight ratio of 5:3:1: 1; the suspending agent is prepared by mixing 3:1:1 weight ratio of lithium bentonite, microcrystalline cellulose and sodium polyacrylate; the binder is formed by mixing yellow dextrin and polyvinyl butyral according to the weight ratio of 4: 1; the defoaming agent is polydimethylsiloxane.
Example 3: the high-temperature-resistant coating for resin sand mold casting is prepared by the following method:
s1, taking 20kg of water, 5kg of suspending agent and 2kg of defoaming agent, stirring and dispersing at a high speed of 1200r/min for 20min to obtain a suspension, and standing for 24 h;
s2, adding 100kg of water into the suspension, adding 8kg of binder after stirring, adding 70kg of refractory aggregate after stirring for 30min, and stirring for 40min to obtain the high-temperature-resistant coating;
wherein the refractory aggregate is prepared by mixing modified kaolinite powder (selected from preparation example 3 of modified kaolinite powder), calcined kaolinite powder (selected from preparation example 3 of calcined kaolinite powder), zircon powder and boron carbide powder in a weight ratio of 5:3:1: 1; the suspending agent is prepared by mixing 3:1:1 weight ratio of lithium bentonite, microcrystalline cellulose and sodium polyacrylate; the binder is formed by mixing yellow dextrin and polyvinyl butyral according to the weight ratio of 4: 1; the defoaming agent is polydimethylsiloxane.
Fourth, comparative example
Comparative example 1: the comparative example differs from example 1 in that the modified and calcined kaolinite powders in the raw materials were replaced with the same amount of kaolinite powder.
Comparative example 2: this comparative example differs from example 1 in that the modified kaolin powder in the feed was replaced with an equal amount of kaolin powder.
Comparative example 3: the difference between the comparative example and the example 1 is that the microcrystalline cellulose and the sodium polyacrylate in the raw materials are replaced by the same amount of lithium bentonite; the polyvinyl butyral was replaced by an equal amount of yellow dextrin.
Comparative example 4: this comparative example differs from example 1 in that the modified kaolin powder was selected from the group consisting of those prepared in preparation example 4.
Comparative example 5: this comparative example differs from example 1 in that the modified kaolin powder was selected from the group consisting of those prepared in preparation example 5.
Fifth, performance test
The properties of the coatings prepared in examples 1 to 3 and comparative examples 1 to 5 were measured according to the method in JB/T9226-2008 "coatings for Sand casting", and the results are shown in Table 1.
Dripping property: and (3) immersing the strip-shaped precoated sand block with the same size into the coating for 2s, taking out the sand block, and recording the dripping number of the coating dripping from the sand block, wherein the I level is 0-2 drops (poor leveling property), the II level is 3-4 drops (good dripping property), and the III level is more than or equal to 5 drops (excessive dripping).
Deviation of coating thickness: and (3) immersing the strip-shaped precoated sand block with the same size into the coating for 2s, taking out the sand block, measuring the coating thickness of the side wall of the sand block at a position 2mm away from the top end and the coating thickness of the side wall of the sand block at a position 2mm away from the bottom end after the coating is dried, and calculating the coating thickness difference of the two positions.
High-temperature bond strength: after the sand block is coated with the coating, the sand block is placed in an electric furnace to be heated to 800 ℃ and is kept warm for 2 hours, after the sand block is cooled, the damage degree of the coating is observed by adopting an external force scratching method, and the measuring method comprises the following steps: scraping with fingers to prevent powder falling in I-grade scraping, slight powder falling in II-grade scraping, severe powder falling in III-grade scraping and peeling of IV-grade scraping coating.
TABLE 1
The dripping property is the expression of the amount of the coating dripping from the surface of the sand core after dip coating; if the coating does not drip or drips less after the sand core is dip-coated, the leveling property of the coating is poor, the coating can be locally accumulated on the sand core, and the size of a casting is inaccurate; if the dripping time is long or the dripping time is not stopped after the sand core is dip-coated, the coating property of the coating is poor, so that the anti-sand-sticking performance of the coating layer is poor; the data in Table 1 show that the suspension rate of the coating prepared by the invention after being placed for 24 hours is more than or equal to 99%, the coating has good dripping property, and the deviation of the thickness of the coating is small, so that the coating prepared by the invention has good leveling property and dripping property, the thicknesses of different positions of the coating can be kept consistent, and the coating has excellent high-temperature strength, and the coating prepared by the invention has good adhesive force to a base material.
Comparative example 1 modified kaolinite powder and calcined kaolinite powder in the raw materials are replaced by equivalent kaolinite powder; compared with example 1, the suspension property and high-temperature bonding strength of the coating of comparative example 1 are obviously poor, and the deviation of the coating thickness is also obviously increased, which shows that the addition of the modified kaolinite powder and the calcined kaolinite powder can obviously improve the suspension property of the coating, and is beneficial to improving the uniformity of the coating thickness and the adhesion to the base material.
Comparative example 2 the modified kaolinite powder in the raw material was replaced by an equivalent amount of kaolinite powder; compared with example 1, the suspension property and high-temperature bonding strength of the coating of comparative example 2 are obviously poor, and the deviation of the coating thickness is also obviously increased, which shows that the addition of the modified kaolinite powder can obviously improve the suspension property of the coating, and is beneficial to improving the uniformity of the coating thickness and the adhesion to the base material.
Comparative example 3 microcrystalline cellulose and sodium polyacrylate in the raw materials are replaced by equal amount of lithium bentonite; replacing the polyvinyl butyral with an equal amount of yellow dextrin; compared with example 1, the suspension property and high-temperature bonding strength of the coating of comparative example 3 are obviously poor, and the deviation of the coating thickness is also obviously increased, which shows that the suspension property of the coating can be obviously improved and the uniformity of the coating thickness and the adhesion to the base material can be improved by adding the suspending agent and the bonding agent compounded by the invention.
The modified kaolin powder in comparative example 4 is selected from the modified kaolin powder prepared in preparation example 4, and the penetrating agent in the preparation of the modified kaolin powder is replaced by deionized water; the modified kaolin powder in comparative example 5 is selected from the modified kaolin powder prepared in preparation example 5, and the penetrant does not contain hydroxypropyl methyl cellulose, fatty alcohol polyoxyethylene ether, disodium alcohol ether sulfosuccinate monoester and sodium methylene dinaphthalene sulfonate; as can be seen from comparison among examples 1, comparative examples 4 and comparative examples 5, in the preparation of the modified kaolin powder, the modified kaolin powder treated by the penetrant containing hydroxypropyl methyl cellulose, fatty alcohol polyoxyethylene ether, alcohol ether sulfosuccinic acid monoester disodium salt and methylene dinaphthalene sodium sulfonate can obviously improve the suspension property of the material, and is beneficial to improving the uniformity of the thickness of the coating and the adhesion to the base material.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. The high-temperature-resistant coating for resin sand casting is characterized by comprising the following components in parts by weight: the paint comprises the following components in parts by weight: 60-70 parts of refractory aggregate, 6-8 parts of binder, 3-5 parts of suspending agent, 1-2 parts of defoaming agent and 120 parts of 100-one water;
the refractory aggregate is prepared by mixing modified kaolinite powder, calcined kaolinite powder, zircon powder and boron carbide powder in a weight ratio of modified 5:3:1: 1;
the suspending agent is prepared by mixing 3:1:1 by weight of lithium bentonite, microcrystalline cellulose and sodium polyacrylate;
the binder is prepared by mixing yellow dextrin and polyvinyl butyral according to a weight ratio of 4: 1.
2. The high-temperature-resistant coating for resin sand casting according to claim 1, which is characterized in that: the calcined kaolin powder is prepared by the following method: taking 60 parts of kaolinite and 10-15 parts of high-magnesium iron ore, and crushing and sieving the kaolinite and the high-magnesium iron ore to obtain kaolinite powder with the fineness of 80-100 meshes and high-magnesium iron ore powder; mixing kaolin powder and high-magnesium iron ore powder, adding 6-10 parts of water, stirring uniformly, standing for 1-2h, and removing supernatant to obtain solid matter; heating the solid to 400-500 ℃ for 1-2 h; then heating to 1200-1400 ℃, calcining for 8-10h, cooling, grinding and sieving to obtain calcined kaolin powder with the fineness of 200-400 meshes.
3. The high-temperature-resistant coating for resin sand casting according to claim 2, characterized in that: heating the solid to 400-500 deg.c at a heating rate of 10-20 deg.c/min; the heating rate is 20-30 ℃/min when the temperature is increased from 400-500 ℃ to 1200-1400 ℃.
4. The high-temperature-resistant coating for resin sand mold casting according to claim 1, which is characterized in that the modified kaolinite powder is prepared by ① steps of crushing and sieving kaolinite to obtain kaolinite powder with the fineness of 80-100 meshes, calcining the kaolinite powder for 3-5 hours at the temperature of 600-700 ℃, and cooling to obtain pretreated kaolinite powder for later use;
② adding 20-30 wt% of penetrant into the pretreated kaolin powder, stirring, standing at 40-50 deg.C for 20-30h, and heating at 120-180 deg.C for 1-2h to obtain modified kaolin powder.
5. The high-temperature-resistant coating for resin sand casting according to claim 4, which is characterized in that: the penetrant is prepared by the following method: taking 30-40 parts of water by weight, adding 5-10 parts of 20wt% hydrochloric acid solution, 1-2 parts of hydroxypropyl methyl cellulose, 1-2 parts of fatty alcohol-polyoxyethylene ether, 0.3-0.7 part of alcohol ether sulfo succinic acid monoester disodium salt and 0.1-0.3 part of methylene dinaphthalene sodium sulfonate, and uniformly stirring to obtain the penetrant.
6. The high-temperature-resistant coating for resin sand casting according to claim 1, which is characterized in that: the defoaming agent is polydimethylsiloxane.
7. A method for preparing the high temperature resistant coating for resin sand casting according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
s1, taking 20 parts of water, 3-5 parts of suspending agent and 1-2 parts of defoaming agent by weight, stirring at a high speed for dispersing for 10-20min to obtain a suspension, and standing for 20-24 h;
and S2, adding 80-100 parts of water into the suspension, adding 6-8 parts of binder after stirring, adding 60-70 parts of refractory aggregate after stirring for 20-30min, and stirring for 30-40min to obtain the high-temperature-resistant coating.
8. The preparation method of the high-temperature-resistant coating for resin sand casting according to claim 7, characterized in that: the stirring speed in S1 is 1000-1200 r/min.
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