CN1175947C - Preparation process of heat resisting film-coating sand - Google Patents
Preparation process of heat resisting film-coating sand Download PDFInfo
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- CN1175947C CN1175947C CNB001080822A CN00108082A CN1175947C CN 1175947 C CN1175947 C CN 1175947C CN B001080822 A CNB001080822 A CN B001080822A CN 00108082 A CN00108082 A CN 00108082A CN 1175947 C CN1175947 C CN 1175947C
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- 239000004576 sand Substances 0.000 title claims abstract description 119
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 239000007888 film coating Substances 0.000 title description 5
- 238000009501 film coating Methods 0.000 title description 5
- 239000005011 phenolic resin Substances 0.000 claims abstract description 27
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 230000001070 adhesive effect Effects 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 120
- 238000005516 engineering process Methods 0.000 claims description 31
- 238000003756 stirring Methods 0.000 claims description 29
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 27
- 230000009970 fire resistant effect Effects 0.000 claims description 24
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 22
- 239000008116 calcium stearate Substances 0.000 claims description 22
- 235000013539 calcium stearate Nutrition 0.000 claims description 22
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 9
- 235000006408 oxalic acid Nutrition 0.000 claims description 9
- 239000000314 lubricant Substances 0.000 claims description 8
- 239000007822 coupling agent Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 235000013312 flour Nutrition 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 206010016256 fatigue Diseases 0.000 claims description 2
- 229910052845 zircon Inorganic materials 0.000 claims description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 9
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 abstract 2
- 235000010299 hexamethylene tetramine Nutrition 0.000 abstract 1
- 239000004312 hexamethylene tetramine Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 238000010112 shell-mould casting Methods 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 15
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000004014 plasticizer Substances 0.000 description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical group [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229940067573 brown iron oxide Drugs 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- KOVKEDGZABFDPF-UHFFFAOYSA-N n-(triethoxysilylmethyl)aniline Chemical compound CCO[Si](OCC)(OCC)CNC1=CC=CC=C1 KOVKEDGZABFDPF-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Mold Materials And Core Materials (AREA)
Abstract
The present invention relates to a technique for preparing refractory coated sand, which comprises: raw sand is heated; the heated raw sand is added with phenolic resin adhesive and evenly stirred with the phenolic resin adhesive; refractory particles are added to the heated raw sand and evenly stirred with the heated raw sand; a solidifying agent (hexamethylenetetramine) is added to the heated raw sand and evenly stirred with the heated raw sand; the mixture is cooled, crushed and screened so as to obtain the finished coated sand. Compared with the prior art, the present invention simplifies the preparation technique for refractory coated sand, and the prepared coated sand can completely meet the basic requirements for the coated sand performance from shell mould casting.
Description
Technical field
The present invention relates to a kind of preparation process of heat resisting film-coating sand.
Background technology
Casting is one of basic activity of machine-building, and the quality of casting quality directly influences the height by the mechanical product quality of its manufacturing.Shell moulded casting belongs to a kind of hot investment casting, and it uses precoated sand as Modeling Material widely, and its advantage is the dimensional accuracy and the surface smoothness height of foundry goods, metallographic structure and good mechanical property, the casting wasted product rate is low, pourable thin-section casting, the production efficiency height, the alloys range that can cast is wide.Shell moulded casting is a roughing sand with quartz sand with precoated sand usually, is binding agent with phenolic resins, and additional necessary curing agent is formulated, and its preparing process is generally:
(1) heating roughing sand;
(2) binding agent that adds 4.5-9% (is 100 calculating with roughing sand) also stirs;
(3) the hexa curing agent that adds 5-20% also stirs;
(4) stearate lubricant of adding 0.1-10%, and cooling, fragmentation;
(5) sieve, obtain the finished product precoated sand.
The precoated sand keeping quality that makes thus is good, can transport at a distance, and is easy to use.
Above-mentioned precoated sand is made the casting mold or the core of shell shape by process for making shell, can be used for casting cast steel, cast iron, alloy cast iron and non-ferrous casting.Along with the progress of industrial expansion and society, the quality of foundry goods and the development of foundry industry are had higher requirement.In shell moulded casting, satisfying under certain room temperature tensile strength, the more important thing is and require shell mould to have good high temperature tensile strength, the heat-resistant time of length and high hot-drawn intensity, usually need to strengthen the consumption of binding agent for this reason, cause the cost of precoated sand to improve thus, gas forming amount increases, and collapsibility descends.
Chinese patent ZL93116639.x discloses a kind of compound technology for filming sand, in order to improve the high-temperature behavior of precoated sand, reduce gas forming amount, this technology needs to add a certain amount of acidic aqueous solution and plasticizer and/or coupling agent in the preparation process of precoated sand, and add lubricant at twice, in addition, in order further to improve the high temperature casting character of precoated sand, promptly improve high temperature tensile strength, can in manufacture process, add particulate.Though can make the precoated sand that high-temperature behavior is good, gas forming amount is low by this technology, its complex process, influence factor is many, is not easy to the control of process.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, a kind of preparation technology of heat resisting film-coating sand is provided, improve the high-temperature behavior of precoated sand, reduce gas forming amount, improve collapsibility, simplify production technology.
Precoated sand preparation technology of the present invention comprises: (1) heating roughing sand; (2) in the roughing sand of heating, add phenolic resin adhesive and stirring; (3) add fire-resistant particulate and stirring; (4) add curing agent hexa and stirring; (5) the cooling said mixture and broken, sieve, obtain the finished product precoated sand.
The scheme that belongs to same design with above-mentioned technology is with above-mentioned processing step (3), (4) transposing, promptly adds hexa earlier, and the back adds fire-resistant particulate, and other is identical.
Compare with prior art, the present invention has simplified the preparation technology of heat resisting film-coating sand, and the precoated sand of being produced can satisfy the basic demand of casting to the precoated sand performance fully.Because the precoated sand of the inventive method manufacturing has good resistance to elevated temperatures, so, can reduce the addition of resin, thereby can reduce gas forming amount, improve collapsibility, and reduce the cost of precoated sand satisfying under the prerequisite of casting to the basic demand of precoated sand performance.
The specific embodiment
Describe the present invention in detail below with reference to embodiment.Other purposes of the present invention and advantage can become clearer by the description of reference embodiment.
Precoated sand preparation technology of the present invention comprises: (1) heating roughing sand; (2) in the roughing sand of heating, add phenolic resin adhesive and stirring; (3) add fire-resistant particulate and stirring; (4) add curing agent hexa and stirring; (5) the cooling said mixture and broken, sieve, obtain the finished product precoated sand.
The scheme that belongs to same design with above-mentioned technology is with above-mentioned processing step (3), (4) transposing, promptly adds hexa earlier, and the back adds fire-resistant particulate, and other is identical.
Described roughing sand can be common silica sand.For high-temperature behavior and the normal temperature performance that improves precoated sand, and further reduce the resin addition, also can use washed-out sand, pickling sand or roasting sand.
Described fire-resistant particulate can be clay, silica flour, graphite powder, magnesia powder, zirconium English powder, brown iron oxide or their mixture.
In order further to bring into play the adhesive property of resin, between step (2), (3), can add plasticizer, coupling agent or both mixtures, and stir, the ratio of its addition and roughing sand is counted 0.001-1 by weight: 100, described plasticizer is Bz101 or Bz102, and coupling agent is a silane coupler.The used coupling agent of the present invention is a silane coupler, as r-aminopropyltriethoxywerene werene, r-glycidol propyl trimethoxy silicane, anilinomethyl triethoxysilane etc.Certainly in resin, also can sneak into plasticizer or coupling agent in advance.Coupling agent make wash with water or the situation of pickling roughing sand under effect particularly outstanding, thereby can realize the purpose of inventing better by it.
The ratio of described roughing sand, fire-resistant particulate, phenolic resins and hexa counts 100 by weight: 0.1-3: 0.8-4, the ratio of hexa and phenolic resins is counted 5-20 by weight: 100.
The granularity of described fire-resistant particulate is preferably the 200-360 order.
In order to prevent the resin caking, to increase flowability, make type, wicking surface densification and improve release property, can be in the process of preparation precoated sand of the present invention between step (4) and (5) adding calcium stearate lubricant and stirring, the ratio of its addition and phenolic resins is counted 3-7 by weight: 100.On this basis, in order to clean the surface of roughing sand, can also add oxalic acid, hydrochloric acid, phosphoric acid or the salicylic aqueous solution between step (2) and (3) and stir, its concentration is 0.0001-10%, and the ratio of its addition and roughing sand is counted 0.05-3 by weight: 100.
Equally, also can between step (2) and (3), add calcium stearate lubricant and stir, the ratio of its addition and phenolic resins is counted 1.5-3.5 by weight: 100, while adds calcium stearate lubricant and stirs between step (4) and (5), the ratio of its addition and phenolic resins is counted 1.5-3.5 by weight: 100.
The heating-up temperature of described roughing sand is 90 ℃-160 ℃, is preferably 110 ℃-150 ℃.
Described roughing sand can be heated to earlier more than 160 ℃ to 1000 ℃, cools to 90 ℃-160 ℃ then.
Described roughing sand can be silica sand, magnesia, zircon sand, chromite sand, emergy or their mixed sand.
Embodiment 1:
(1) heating roughing sand to 90 is ℃-160 ℃;
(2) in the roughing sand of heating, add phenolic resin adhesive and stirring;
(3) add fire-resistant particulate and stirring;
(4) add curing agent hexa and stirring;
(5) the cooling said mixture and broken, sieve, obtain the finished product precoated sand.
The ratio of described roughing sand, fire-resistant particulate, phenolic resins counts 100 by weight: 0.1-3: 0.8-4, the ratio of hexa and phenolic resins is counted 5-20 by weight: 100.
The order of above-mentioned steps (3), (4) can be changed.
Embodiment 2:
Except that (1) heating roughing sand to 90 ℃, all the other are with embodiment 1.
Embodiment 3:
Except that (1) heating roughing sand to 120 ℃, all the other are with embodiment 1.
Embodiment 4:
Except that except that (1) heating roughing sand to 160 ℃, all the other are with embodiment 1.
Embodiment 5:
Except that phenolic resins added 0.8 parts by weight, all the other were with embodiment 1-4.
Embodiment 6:
Except that phenolic resins added 1.0 parts by weight, all the other were with embodiment 1-4.
Embodiment 7:
Except that phenolic resins added 1.5 parts by weight, all the other were with embodiment 1-4.
Embodiment 8:
Except that phenolic resins added 2.0 parts by weight, all the other were with embodiment 1-4.
Embodiment 9:
Except that phenolic resins added 3.0 parts by weight, all the other were with embodiment 1-4.
Embodiment 10:
Except that phenolic resins added 3.5 parts by weight, all the other were with embodiment 1-4.
Embodiment 11:
Except that phenolic resins added 4 parts by weight, all the other were with embodiment 1-4.
Embodiment 12:
Except that fire-resistant particulate added 0.1 parts by weight, all the other were with embodiment 1-11.
Embodiment 13:
Except that fire-resistant particulate added 0.5 parts by weight, all the other were with embodiment 1-11.
Embodiment 14:
Except that fire-resistant particulate added 1.0 parts by weight, all the other were with embodiment 1-11.
Embodiment 15:
Except that fire-resistant particulate added 1.5 parts by weight, all the other were with embodiment 1-11.
Embodiment 16:
Except that fire-resistant particulate added 2.0 parts by weight, all the other were with embodiment 1-11.
Embodiment 17:
Except that fire-resistant particulate added 3.0 parts by weight, all the other were with embodiment 1-11.
Embodiment 18:
Except that hexa added 5 parts by weight, all the other were with embodiment 1-17.
Embodiment 19:
Except that hexa added 10 parts by weight, all the other were with embodiment 1-17.
Embodiment 20:
Except that hexa added 15 parts by weight, all the other were with embodiment 1-17.
Embodiment 21:
Except that hexa added 20 parts by weight, all the other were with embodiment 1-17.
Embodiment 22:
Except that the granularity of fire-resistant particulate is 200 orders, all the other are with embodiment 1-21.
Embodiment 23:
Except that the granularity of fire-resistant particulate is 300 orders, all the other are with embodiment 1-21.
Embodiment 24:
Except that the granularity of fire-resistant particulate is 360 orders, all the other are with embodiment 1-21.
Embodiment 25:
Except that adding calcium stearate 3 parts by weight between step (4), (5), all the other are with embodiment 1-24.
Embodiment 26:
Except that adding calcium stearate 4 parts by weight between step (4), (5), all the other are with embodiment 1-24.
Embodiment 27:
Except that adding calcium stearate 5 parts by weight between step (4), (5), all the other are with embodiment 1-24.
Embodiment 28:
Except that adding calcium stearate 6 parts by weight between step (4), (5), all the other are with embodiment 1-24.
Embodiment 29:
Except that adding calcium stearate 7 parts by weight between step (4), (5), all the other are with embodiment 1-24.
Embodiment 30:
Except that adding calcium stearate 1.5 parts by weight between step (2), (3), adding between step (4), (5) the calcium stearate 1.5-3.5 parts by weight, all the other are with embodiment 1-24.
Embodiment 31:
Except that adding between step (2), (3) calcium stearate 2.0 parts by weight, all the other together
Embodiment 30.
Embodiment 32:
Except that adding between step (2), (3) calcium stearate 2.5 parts by weight, all the other together
Embodiment 30.
Embodiment 33:
Except that adding calcium stearate 3 parts by weight between step (2), (3), all the other are with embodiment 30.
Embodiment 34:
Except that adding between step (2), (3) calcium stearate 3.5 parts by weight, all the other together
Embodiment 30.
Embodiment 35:
Except that adding between step (4), (5) calcium stearate 1.5 parts by weight, all the other together
Embodiment 30-34.
Embodiment 36:
Except that adding calcium stearate 2 parts by weight between step (4), (5), all the other are with embodiment 30-34.
Embodiment 37:
Except that adding between step (4), (5) calcium stearate 2.5 parts by weight, all the other together
Embodiment 30-34.
Embodiment 38:
Except that adding calcium stearate 3 parts by weight between step (4), (5), all the other are with embodiment 30-34.
Embodiment 39:
Except that adding between step (4), (5) calcium stearate 3.5 parts by weight, all the other together
Embodiment 30-34.
Embodiment 40:
Except that add concentration between step (2), (3) is that all the other are with embodiment 1-29 oxalic acid, hydrochloric acid, phosphoric acid or the salicylic aqueous solution 0.05 parts by weight of 0.0001-10%.
Embodiment 41:
Except that add concentration between step (2), (3) is that all the other are with embodiment 1-29 oxalic acid, hydrochloric acid, phosphoric acid or the salicylic aqueous solution 0.5 parts by weight of 0.0001-10%.
Embodiment 42:
Except that add concentration between step (2), (3) is that all the other are with embodiment 1-29 oxalic acid, hydrochloric acid, phosphoric acid or the salicylic aqueous solution 1.0 parts by weight of 0.0001-10%.
Embodiment 43:
Except that add concentration between step (2), (3) is that all the other are with embodiment 1-29 oxalic acid, hydrochloric acid, phosphoric acid or the salicylic aqueous solution 2 parts by weight of 0.0001-10%.
Embodiment 44:
Except that add concentration between step (2), (3) is that all the other are with embodiment 1-29 oxalic acid, hydrochloric acid, phosphoric acid or the salicylic aqueous solution 3 parts by weight of 0.0001-10%.
Precoated sand of the present invention also can use other binding agents that meet the object of the invention.
Used fire-resistant micronized clay, silica flour, graphite powder, magnesia powder, zirconium English powder or their the mixture addition of the present invention is too high, and its binder amount that expends is big, and the precoated sand gas forming amount is increased, and performance descends; Addition is low excessively, and resistance to elevated temperatures is bad.
In order to improve the surface quality of foundry goods, can add an amount of brown iron oxide, the ratio of its addition and roughing sand is counted about 2: 100 by weight.
In order further to improve collapsibility, after hybrid resin, can add amount of urea or potassium permanganate as defeated and dispersed dose.
Among the preparation technology of precoated sand of the present invention, the sand temperature during hybrid resin is 90 ℃-160 ℃, and the time that each step mixing is stirred decides according to the actual conditions that mixes control equipment, generally is no more than five minutes.
Compare with common precoated sand, precoated sand high temperature compression strength of the present invention is greatly improved, and can reach more than the 0.8mpa, and gas forming amount reduces 50%, and heat-resistant time doubles, and hot-drawn intensity is greater than 115mpa, and room temperature tensile strength satisfies the shell moulded casting requirement.Because the precoated sand high-temperature behavior improves, so satisfying under the prerequisite of shell moulded casting to the basic demand of precoated sand performance, can reduce the addition of resin, thereby can reduce the cost of precoated sand, and improve collapsibility.
Compare with prior art, technology of the present invention can reduce processing step, and good by its prepared core resistance to elevated temperatures, can satisfy foundry goods fully to the core performance demands, thereby improve the efficient of coremaking, reduce cost, adapt to industrial production requirement.
Above-mentioned with reference to embodiment to the invention description just illustrative, and do not constitute to the invention restriction.Be appreciated that those skilled in the art can make many improvement on basis of the present invention, but do not break away from essence of the present invention.
Claims (16)
1, a kind of precoated sand preparation technology comprises:
(1) heating roughing sand;
(2) in the roughing sand of heating, add phenolic resin adhesive and stirring;
It is characterized in that this technology is further comprising the steps of:
(3) add fire-resistant particulate and stirring;
(4) add curing agent hexa and stirring;
(5) the cooling said mixture and broken, sieve, obtain the finished product precoated sand.
2, a kind of precoated sand preparation technology comprises:
(1) heating roughing sand;
(2) in the roughing sand of heating, add phenolic resin adhesive and stirring;
It is characterized in that this technology is further comprising the steps of:
(3) add curing agent hexa and stirring;
(4) add fire-resistant particulate and stirring;
(5) the cooling said mixture and broken, sieve, obtain the finished product precoated sand.
3, precoated sand preparation technology according to claim 1 and 2 is characterized in that, described roughing sand is washed-out sand, pickling sand or roasting sand.
4, precoated sand preparation technology according to claim 1 and 2 is characterized in that, described fire-resistant particulate is clay, silica flour, graphite powder, magnesia powder, zirconium English powder or their mixture.
5, precoated sand preparation technology according to claim 1 and 2 is characterized in that, adds coupling agent in step (2), step between (3), and stirs, and the ratio of its addition and roughing sand is counted 0.001-1 by weight: 100.
6, precoated sand preparation technology according to claim 1 and 2, it is characterized in that, the ratio of roughing sand, fire-resistant particulate, phenolic resins counts 100 by weight: 0.1-3: 0.8-4, the ratio of hexa and phenolic resins is counted 5-20 by weight: 100.
7, precoated sand preparation technology according to claim 6 is characterized in that, the granularity of described fire-resistant particulate is the 200-360 order.
8, precoated sand preparation technology according to claim 6 is characterized in that, adds calcium stearate lubricant and stir between step (4) and step (5), and the ratio of itself and phenolic resins is counted 3-7 by weight: 100.
9, precoated sand preparation technology according to claim 6, it is characterized in that, can between step (2) and step (3), add calcium stearate lubricant and stir, the ratio of itself and phenolic resins is counted 1.5-3.5 by weight: 100, and add calcium stearate lubricant and stir between step (4) and step (5), the ratio of itself and phenolic resins is counted 1.5-3.5 by weight: 100.
10, precoated sand preparation technology according to claim 6, it is characterized in that, can between step (2) and step (3), add oxalic acid, hydrochloric acid, phosphoric acid or the salicylic aqueous solution and stir, its concentration is 0.0001-10%, and the ratio of its addition and roughing sand is counted 0.05-3 by weight: 100.
11, precoated sand preparation technology according to claim 7, it is characterized in that, can between step (2) and step (3), add oxalic acid, hydrochloric acid, phosphoric acid or the salicylic aqueous solution and stir, its concentration is 0.0001-10%, and the ratio of its addition and roughing sand is counted 0.05-3 by weight: 100.
12, precoated sand preparation technology according to claim 8, it is characterized in that, can between step (2) and step (3), add oxalic acid, hydrochloric acid, phosphoric acid or the salicylic aqueous solution and stir, its concentration is 0.0001-10%, and the ratio of its addition and roughing sand is counted 0.05-3 by weight: 100.
13, precoated sand preparation technology according to claim 6 is characterized in that, the heating-up temperature of described roughing sand is 90 ℃-160 ℃.
14, precoated sand preparation technology according to claim 11 is characterized in that, the heating-up temperature of described roughing sand is 110 ℃-150 ℃.
15, precoated sand preparation technology according to claim 11 is characterized in that, described roughing sand is to be heated to earlier more than 160 ℃ to 1000 ℃, cools to 90 ℃-160 ℃ then.
16, precoated sand preparation technology according to claim 1 is characterized in that, described roughing sand is silica sand, magnesia, zircon sand, chromite sand, emergy or their mixed sand.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001080822A CN1175947C (en) | 2000-06-13 | 2000-06-13 | Preparation process of heat resisting film-coating sand |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001080822A CN1175947C (en) | 2000-06-13 | 2000-06-13 | Preparation process of heat resisting film-coating sand |
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| CN1274626A CN1274626A (en) | 2000-11-29 |
| CN1175947C true CN1175947C (en) | 2004-11-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102069140A (en) * | 2011-02-16 | 2011-05-25 | 西峡县众德汽车部件有限公司 | Novel film coating sand |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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-
2000
- 2000-06-13 CN CNB001080822A patent/CN1175947C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102069140A (en) * | 2011-02-16 | 2011-05-25 | 西峡县众德汽车部件有限公司 | Novel film coating sand |
| CN102069140B (en) * | 2011-02-16 | 2012-03-28 | 西峡县众德汽车部件有限公司 | Novel film coating sand |
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