CN100506426C - Mould using for organic binder, molding sand composition and mould - Google Patents
Mould using for organic binder, molding sand composition and mould Download PDFInfo
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- CN100506426C CN100506426C CNB2006101017715A CN200610101771A CN100506426C CN 100506426 C CN100506426 C CN 100506426C CN B2006101017715 A CNB2006101017715 A CN B2006101017715A CN 200610101771 A CN200610101771 A CN 200610101771A CN 100506426 C CN100506426 C CN 100506426C
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Abstract
The invention provides an organic adhesive used in casting which can assure excellent casting intensity when phenolic aldehyde carbamate is cast, and can solve or reduce the sand-sticking problem that the sclerosis molding sand composition sticks on the surface of a mould. The organic adhesive of the invention is used in the gas sclerosis casting and the molding of the self- sclerosis casting of the phenolic aldehyde carbamate. The invention is characterized in that: the organic adhesive adopts a condensation product of unsaturated fatty acid with alcoholic hydroxyl, phenol formaldehyde resin, polyisocyanate compound, and organic solvent as the essential components.
Description
Technical field
The present invention relates to the molding sand composition and the casting mold that are used for the mould using for organic binder of gas hardening casting mold and self-hardening property making molds and use this mould using for organic binder to obtain, wherein, described gas hardening casting mold and self-hardening property casting mold are gas hardening casting mold and the self-hardening property casting mold that is used for the phenolic urethane class of sand casting.
Background technology
In the past, as being used for one of representative organic class casting mold of sand casting, known have the phenolic resins of use and polyisocyanate compounds as binding agent, the phenolic urethane class casting mold that utilizes the sudden reaction (urethane reaction) between them to carry out moulding.As this phenolic urethane class casting mold, knownly when being arranged, moulding need not heating, and utilize the yield production type gas hardening casting mold of ice chest manufactured and utilize the non-yield production type self-hardening property casting mold of air set manufactured.
Particularly, the gas hardening casting mold that adopts the ice chest manufactured usually by use puddle mixer with granular refractory sexual type sand with by mutually mixing as the mould using for organic binder that the phenol resin solution and the polyisocyanate compounds solution of solvent forms with organic solvent, after being manufactured on the molding sand composition that the lining organic binder bond forms on the molding sand surface, described molding sand composition is blown in the shaping mould of regulation and forms casting mold, feed catalyst gas such as amine gas then and harden and make.In addition, the self-hardening property casting mold that adopts the air set manufactured by with granular refractory sexual type sand with by the mould using for organic binder that forms as the phenol resin solution and the polyisocyanate compounds solution of solvent with organic solvent when mixing, while mixed hardening catalyst, resulting mixture direct forming is that desired shape is made.
But, the phenolic urethane class casting mold that the molding sand composition moulding that is obtained by the above-mentioned organic binder bond of use forms, when moulding, casting mold after the sclerosis is from as the metal pattern of shaping mould during the demoulding, the molding sand that is coated with binding agent after the sclerosis sticks to the metal pattern surface firmly, and be deposited in the metal pattern surface along with carrying out repeatedly of above-mentioned molding operation, and cause the moulding defective of casting molds such as core, promptly produce so-called " scab " problem.
Therefore, special public clear 48-32253 communique (patent documentation 1) has clearly been put down in writing above-mentioned for preventing " scab ", by in the molding sand composition, cooperating aliphatic acid to carry out moulding, make molding sand after the sclerosis not stick to the manufacture method of the casting mold on shaping mould surface, even if the inventor etc. find to use above-mentioned aliphatic acid as " anti-scab agent " after deliberation, its effect is also also insufficient, especially when using shaping mould (metal pattern) repeatedly, exist the problem that the shaping mould surface " scab amount " of the molding sand after the sclerosis increases, in addition, aspect mould strength, especially use to make after the time molding sand composition more of a specified duration when making casting mold, have the problems such as mould strength deficiency that obtain.
[patent documentation 1] special public clear 48-32253 communique
Summary of the invention
The present invention is that background is finished with above-mentioned situation, the problem that solves is, good mould strength when guaranteeing phenolic urethane class making molds, advantageously solve simultaneously or alleviate " scab " problem that molding sand composition after the sclerosis sticks to the shaping mould surface, in addition, even provide use with molding sand mixing after the time molding sand composition moulding more of a specified duration casting mold that obtains also can advantageously improve the technology of its intensity.
For solving above-mentioned problem, the present invention is main points with the mould using for organic binder, described mould using for organic binder is used for the moulding of the gas hardening casting mold or the self-hardening property casting mold of phenolic urethane class, it is characterized by, condensation product and phenolic resins, polyisocyanate compounds, organic solvent with unrighted acid of alcoholic extract hydroxyl group together are used as necessary constituent.
In addition, main points of the present invention also are the molding sand composition, and being characterized as of described molding sand composition makes above-mentioned mould using for organic binder mutually mixing with molding sand.
And, main points of the present invention also are to contact with described molding sand composition by catalyst gas, make gas hardening casting mold that the sclerosis of this molding sand composition forms and, the self-hardening property casting mold that mixing hardening catalyst and described mould using for organic binder form in molding sand.
Mould using for organic binder of the present invention, as its necessary constituent, remove the phenolic resins that uses at present, polyisocyanate compounds and be used to dissolve outside their organic solvent, also use the condensation product of unrighted acid with alcoholic extract hydroxyl group, thus when the casting mold that uses the molding sand composition that is made of this organic binder bond and molding sand is carried out moulding, can suppress effectively or prevent that its hardening thing from sticking to the mould surface, even if repeat to implement the molding operation of casting mold, also can suppress to adhere to " the scab amount " that cause by the molding sand composition that hardens effectively increases, so can increase the making molds quantity of single mould, improve the productivity ratio of casting mold, in addition, can significantly improve the moulding operation, and help reducing the moulding cost.
And, the molding sand composition that uses above-mentioned mould using for organic binder to make, even if when use making after (with molding sand mixing) molding sand composition through the long period and coming moulding target casting mold, the intensity of the casting mold that obtains is also enough high, after not only moulding has just been finished, the intensity of moulding casting mold after 24 hours is also very high, so can avoid problem such as casting mold breakage effectively, has to be used in actual moulding operation.
The present invention is for solving described problem, the various embodiments of enumerating below preferred, and below Ji Zai various schemes can make up enforcement arbitrarily.Need to prove that the solution of the present invention or technical characterictic all are not limited to the following content of putting down in writing, should be understood to can based on specification put down in writing in full and accompanying drawing in the scheme that draws of the inventive concept put down in writing.
(1) is used for the phenolic urethane class organic binder bond of gas hardening casting mold or self-hardening property making molds, it is characterized by, the condensation product of unrighted acid that uses phenolic resins, polyisocyanate compounds, organic solvent simultaneously and have an alcoholic extract hydroxyl group is as must constituent.
(2) mould using for organic binder of being put down in writing as above-mentioned scheme (1), wherein, the neutralization number of described condensation product is below 100 or 100.
Herein, described neutralization number is the index of the carboxyl number in the condensation product, and as described in this programme (2), neutralization number is low, the few condensation product of carboxyl (acid) number can effectively improve anti-scab effect.
(3) mould using for organic binder of being put down in writing as above-mentioned scheme (1) or (2), wherein, the condensation degree of described condensation product is more than 1.8 or 1.8.
(4) as each mould using for organic binder put down in writing in above-mentioned scheme (1)～(3), wherein, described unrighted acid is a castor oil acid.
(5) as each mould using for organic binder put down in writing in above-mentioned scheme (1)～(4), this binding agent is to make described condensation product and can react with the compound of wherein residual carboxyl or hydroxyl reaction and be used under the form that forms.
(6), wherein further contain and prolong agent service life as must constituent as each mould using for organic binder put down in writing in above-mentioned scheme (1)～(5).
(7) a kind of molding sand composition is characterized by, and each mould using for organic binder put down in writing and molding sand in the mixing such scheme of described molding sand composition (1)～(6) form.
(8) a kind of gas hardening casting mold is to contact with catalyst gas by the molding sand composition that such scheme (7) is put down in writing, and makes the sclerosis of this molding sand composition and forms.
(9) a kind of self-hardening property casting mold is that the mould using for organic binder by mixing hardening catalyst and such scheme (1)～(6) each record simultaneously in molding sand forms.
Description of drawings
Fig. 1 is the cross sectional illustration figure of test metal pattern that is used for estimating embodiment " scab ".
Drawing reference numeral
2 experiment metal patterns
4 charging apertures
6 sheet metals
The specific embodiment
In the mould using for organic binder of the invention described above, the phenolic resins that uses as one of main component is not particularly limited, used known various phenolic resins in the time of can suitably using existing phenolic urethane class making molds.Particularly, can be set forth under the existence of catalysts, make phenols and aldehydes carry out the benzyl ether type phenolic resins that dissolves in organic solvent, solvable type phenolic resins, linear phenol-aldehyde resin, their sex change phenolic resins and their mixture that polyaddition reaction obtains according to the ratio that is generally 0.5～3.0 mole with respect to 1 mole of phenols, aldehydes, can suitably select to use wherein a kind, more than 2 kinds or 2 kinds.Wherein, since through the orthoresol sex change phenolic resins of orthoresol sex change, particularly benzyl ether type orthoresol sex change phenolic resins and their mixture not only have the good dissolubility in organic solvent and with the intermiscibility of isocyanates, and can effectively improve the intensity (initial strength) etc. of resulting casting mold, so preferably use in the present invention.
Need to prove, the catalyst that is used for the addition condensation reaction of above-mentioned phenols and aldehydes is not particularly limited, can be according to the type of desirable phenolic resins, use known acidic catalyst or base catalyst, in addition, also can suitably use the various catalyst that are used to prepare phenolic resins at present.As above-mentioned catalyst, can enumerate the slaine of metallic elements such as containing tin, lead, zinc, cobalt, manganese, nickel etc., more specifically, the combination etc. that can enumerate lead naphthenate, zinc naphthenate, lead acetate, zinc chloride, zinc acetate, Firebrake ZB, lead oxide and can form the bronsted lowry acids and bases bronsted lowry of above-mentioned slaine.In addition, when described slaine used as catalysts, though its use amount is not particularly limited, generally with respect to phenols 100 weight portions, use amount was that the ratio about 0.01～5 weight portion is used.
In addition, as the phenols that is used for phenolic resins, can enumerate alkylphenols such as phenol, cresols, xylenols, p-tert-butylphenol, nonyl phenol, polyhydric phenols and their mixtures such as resorcinol, Bisphenol F, bisphenol-A; As aldehydes, can enumerate formaldehyde, formalin, paraformaldehyde, polyformaldehyde, glyoxal, alditol and their mixture etc.
In addition, as mentioned above, as the orthoresol sex change phenolic resins that can be effective to one of the phenolic resins among the present invention, for example can enumerate, in the presence of catalysts such as slaine, make orthoresol and phenol and aldehydes (1) orthoresol that obtains of reaction and the cocondensation mould assembly orthoresol sex change phenolic resins of phenol, (2) the mixed type orthoresol sex change phenolic resins of orthoresol resin and phenolic resin, the resin that in addition can also enumerate (1) and (2) reaches (1) with (3) modified version orthoresol sex change phenolic resins that denaturant (modifier) carries out obtaining after the modification, (2), (3) mixture that combines more than 2 kinds or 2 kinds in.
More specifically, the cocondensation mould assembly orthoresol sex change phenolic resins of above-mentioned (1) is to make orthoresol and phenol react the cocondensation resin that obtains with aldehydes simultaneously or interimly, kind and reaction condition according to employed catalysts, can obtain the cocondensation mould assembly orthoresol sex change phenolic resins that line style, solvable type, benzyl ether type and the above-mentioned type combine, among the present invention, the cocondensation mould assembly orthoresol sex change phenolic resins of preferred above-mentioned benzyl ether type.Need to prove, as the cooperate ratio of orthoresol, from improving the viewpoints such as initial strength of casting mold, preferred orthoresol/phenol (weight ratio)=10/90～90/10, preferred especially 20/80～80/20 with phenol.
The mixed type orthoresol sex change phenolic resins of above-mentioned (2) be at least a orthoresol resin from line style, solvable type and benzyl ether type orthoresol resin that the reaction of orthoresol and aldehydes obtains, selected, with react at least a phenolic resins of selecting line style, solvable type and the benzyl ether type phenolic resins that obtains from orthoresol and aldehydes and mix and obtain.Wherein, the preferred benzyl ether type of the present invention orthoresol resin mixes the benzyl ether type mixed type orthoresol sex change phenolic resins that obtains with benzyl ether type phenolic resins.In addition, for described mixed type orthoresol sex change phenolic resins, from improving the viewpoints such as initial strength of casting mold, what also require orthoresol and phenol cooperates ratio in above-mentioned scope, for this reason, the mixed proportion of orthoresol resin and phenolic resins is preferably orthoresol resin/phenol-formaldehyde resin (weight ratio)=10/90～90/10, preferred especially 20/80～80/20.
At least a modified version orthoresol sex change phenolic resins of the modified version orthoresol sex change phenolic resins of above-mentioned (3) for from following resin, selecting, described resin is at preparation cocondensation mould assembly orthoresol sex change phenolic resins, when orthoresol resin and phenolic resins or after the preparation, these resins are mixed with denaturant (modifier) arbitrarily or react and carry out the line style that obtains after the modification, solvable type and dibenzyl ether type resin, described denaturant can enumerate as, alkyd resins, epoxy resin, melamine resin, urea resin, xylene resin, the vinylacetate resin, polyamide, urea compound, the melamine compounds, epoxy compounds, furfuryl alcohol, polyvinyl alcohol, urea, amide-type, Linseed oil, cashew nut shell liquid, rosin, starch, monosaccharide etc., the modified version orthoresol sex change phenolic resins of the preferred benzyl ether type of the present invention.
But, the phenolic resins that uses as one of main component of mould using for organic binder of the present invention, from low viscosity, with the intermiscibility of polyisocyanate ester solution described below, aspects such as the coating of molding sand, casting mold physical property are considered, usually it is dissolved in the mixed solvent of being made up of polar organic solvent and non-polar organic solvent, makes the solution that concentration is about 30%～80 weight % (hereinafter referred to as " phenol resin solution ") and use.
In addition, the polyisocyanate compounds that uses as another main component of mould using for organic binder of the present invention is the compound that has 2 or 2 above NCOs in the molecule, described polyisocyanate compounds can carry out sudden reaction with the reactive hydrogen of above-mentioned phenolic resins, thereby makes between the molding sand molecule through the phenolic urethane chemical bonding.Object lesson as above-mentioned polyisocyanate compounds, can enumerate aromatic series, the PIC of aliphatic or ester ring type, as, methyl diphenylene diisocyanate, polymethylene polyphenylene(poly)isocyanate (hereinafter referred to as " polymeric MDI "), hexamethylene diisocyanate, 4,4 '-dicyclohexyl methyl hydride diisocyanate, in addition, can also enumerate the existing known various PICs such as prepolymer that these polyisocyanate compounds and polyol reaction obtain with 2 or 2 above NCOs, above-mentioned substance can use separately, also can be used in combination more than 2 kinds or 2 kinds.
Based on the reason identical with above-mentioned phenolic resins, described polyisocyanate compounds also use non-polar solven usually or the mixed solvent made by non-polar solven and polar solvent as solvent, be dissolved in and obtain the solution that concentration is about 40～90 weight % in this organic solvent and use.In addition,, organic solvent may not be dissolved in, also stoste can be directly used according to the kind of the polyisocyanate compounds that uses etc.Below, the stoste of polyisocyanate compounds and polyisocyanate compounds are dissolved in the solution that forms in the organic solvent are called the polyisocyanate ester solution.
Need to prove, organic solvent as above-mentioned phenolic resins of dissolving and polyisocyanate compounds, as long as to the polyisocyanate compounds anergy and to the solute (phenolic resins or polyisocyanate compounds) as the dissolving object is good solvent, be not particularly limited, usually be used in combination i) be used to dissolve the polar solvent of phenolic resins and the non-polar solven that ii) is used to dissolve polyisocyanate compounds, the amount of described non-polar solven is not for causing the amount of phenolic resins separation.
More specifically, as above-mentioned i) polar solvent, can enumerate as, the aliphatic carboxylic acid esters, wherein, especially considers from the environmental safety aspect, uses dicarboxylic acids mixtures of methyl esters (Du Pont society system; Trade name: DBE; The mixture of dimethyl glutarate, dimethyl adipate and dimethyl succinate) methyl esters of vegetable oil such as dicarboxylic acids Arrcostab, rapeseed methylester, ethyl oleate, ethyl palmitate, their ester class such as mixture etc., fatty-acid monoester such as, in addition, can enumerate as ethers such as ketones such as isophorone, isopropyl ether, furfuryl alcohol etc.In addition, as above-mentioned non-polar solven ii), can enumerate as oil such as paraffin class, cycloalkane, alkyl benzenes is hydro carbons, can enumerate as concrete example, and (Idemitsu Kosen Co., Ltd. produces IPUSOL 150; The oil series solvent), (Shell Chemicals Japan Co., Ltd. produces HAWS; The oil series solvent) etc.
In the mould using for organic binder of the present invention, except that above-mentioned phenol resin solution and polyisocyanate ester solution, also use the condensation product of unrighted acid as necessary constituent with alcoholic extract hydroxyl group, utilize the molding sand composition that uses above-mentioned mould using for organic binder to obtain to carry out the moulding of target casting mold, can suppress " scab " of molding sand effectively to the mould surface, improve the mouldable number of times of mould, reduce cleaning mould surface simultaneously, operations such as coating releasing agent, can prevent that the moulding operation from stopping, even productivity ratio reduces, in addition, can also significantly improve characteristics such as mould strength.
Need to prove, the condensation product that helps to show the unrighted acid with alcoholic extract hydroxyl group of above-mentioned good action effect is the condensation product that has the aliphatic compound of alcoholic extract hydroxyl group, carboxyl and a unsaturated bond at least, usually use above-mentioned aliphatic compound from condensation product, the condensation product that can also use this to obtain in addition from polyol reactions such as condensation product and glycerine, in addition, the cocondensation compound of polyalcohols such as the aliphatic compound (unrighted acid) that also can use described regulation and glycerine with alcoholic extract hydroxyl group.
The above-mentioned specific unrighted acid that is used for preparing the condensation product that the present invention uses has 4 or 4 above carbon atoms usually, the long-chain unsaturated fatty acid that preferably has 10～20 carbon atoms, the unrighted acid that special preferred alcohols hydroxyl number is Duoed than the carboxyl number.Particularly,, can enumerate castor oil acid, 10-hydroxyl-2-decylenic acid etc. as above-mentioned unrighted acid, wherein, the condensation product that the present invention preferably uses castor oil acid to obtain.
And, as mentioned above, preferably make the condensation product that uses among the present invention and can with the compound reaction of residual carboxyl in the condensation product or hydroxyl reaction after use, in addition, the product (condensation product) that obtains with polyol reactions such as described glycerine also is one of preferred form, in addition, also can before reacting, make polyisocyanate compounds and the reaction of described condensation product with the urethane esterification of phenolic resins, this form also can be used for the urethane reaction with phenolic resins, thereby gives full play of characteristics of the present invention.
The condensation product that uses among the present invention substantially by 2 molecules or more than 2 molecules above-mentioned unrighted acid condensation constitute, preferably mainly form, especially preferably mainly constitute by 4～6 molecule unrighted acid condensations by 4 molecules or the above unrighted acid condensation of 4 molecules.And, the condensation number of above-mentioned unrighted acid replaces with the condensation degree that calculates as described below: with the neutralization number of the unrighted acid before the condensation as molecule, the neutralization number of the aliphatic acid after the condensation (condensation product) is as denominator, according to following formula: condensation degree=(neutralization number of the unrighted acid before the condensation)/(as the neutralization number of the condensation product of the aliphatic acid after the condensation) calculated condensation degree, the above-mentioned condensation degree of the general use of the present invention is the condensation product more than 1.8 or 1.8, wherein, preferred condensation degree is the condensation product more than 3.5 or 3.5.In addition, consumed carboxyls all in the condensation product by make polyol reaction according to aforementioned preferred configuration, should be understood to condensation degree when not having carboxyl in the condensation product is zero.
As the condensation product of the unrighted acid with alcoholic extract hydroxyl group among the present invention, its neutralization number is generally below 100 or 100, below preferred 60 or 60, and preferred especially 10～50; Iodine number is generally more than 70 or 70, more than preferred 80 or 80, more than preferred especially 90 or 90; In addition, hydroxyl value is preferably more than 5 or 5.Herein, iodine number is the index of unsaturated bond number, and how anti-the more scab effect of unsaturated bond number be good more, so preferred iodine number is big more preferred more; In addition, hydroxyl value is the index of hydroxyl value, and described hydroxyl is used for and isocyanate reaction, thus preferably exist a certain amount of more than.Neutralization number is little, iodine number big and the big condensation product of hydroxyl value by using, and can further improve and prevents the scab effect.In addition, above-mentioned neutralization number and iodine number can be tried to achieve according to the experimental technique of 5.1 and 5.2 among the JIS-K-3341 (1957), and hydroxyl value can be tried to achieve according to the experimental technique of 5.4 records of JIS-K-3342 (1961).
In order to realize intended purposes, the use amount of the condensation product of the invention described above can be according to suitably decisions such as the kind of kind, phenolic resins and the polyisocyanate compounds of condensation product self, use amounts, generally speaking, with respect to polyisocyanate compounds 100 weight portions, its use amount is 0.07～33 weight portion, preferred 1.3～13 weight portions, preferred especially 4～10 weight portions.If the use amount of condensation product is too small, then be difficult to fully reach purpose of the present invention, if the use amount of condensation product is too much, then have the mobile tendency that descends, also uneconomical, so not preferred.
The present invention is by the condensation product and the phenol resin solution and the polyisocyanate ester solution that form phenolic urethane of afore mentioned rules, formation is as the mould using for organic binder of target, preferably in this organic binder bond, further be used life extender, in addition, can also be as required, suitably select, cooperate known suitable releasing agent, strength degradation to prevent that agent, anti-drying dose etc. are used for the known various additives of mould using for organic binder at present.Certainly the use amount of above-mentioned various additives must be in the scope of not damaging effect of the present invention.
Herein, as prolonging agent (sclerosis delayer) in service life of preferred use, can use the composition in the service life that is used to suppress urethane reaction, extended pattern sand composition at present, can suitably select to use known all cpds among the present invention, can enumerate as, m-phthaloyl chloride, salicylic acid, benzoic acid, phosphoric acid, acid phosphoric acid ester, Phosphorus chloride, boric acid etc.
Strength degradation prevents that agent can be used for preventing that the mould strength in many wet environments from degenerating, simultaneously can improve the resinous principle of organic binder bond and the cohesive between the molding sand, can enumerate as silane coupling agents such as epoxies silane such as amino one type of silane, γ-glycidoxypropyltrimewasxysilane such as N-β (amino-ethyl)-gamma-amino propyl trimethoxy silicane, γ-An Jibingjisanyiyangjiguiwans as preference.Prevent the use amount of agent as described strength degradation, with respect to phenolic resins 100 weight portions, its use amount is generally 0.01～5 weight portion, preferred 0.05～2.5 weight portion.
As mentioned above, constitute mould using for organic binder of the present invention, use this organic binder bond, carry out the moulding of the gas hardening casting mold or the self-hardening property casting mold of phenolic urethane class by above-mentioned various compositions.
Particularly, when adopting ice chest method moulding gas hardening casting mold, at first,, make molding sand composition (mixing sand) at the surface-coated mould using for organic binder of described molding sand by mould using for organic binder of the present invention is mutually mixing with molding sand.Promptly, will be as phenol resin solution, polyisocyanate ester solution, the polycondensation product of regulation and other various additives and abundant mixing mixing of molding sand that use as required of organic binder bond, at the surface-coated mould using for organic binder of molding sand, make the molding sand composition.At this moment, for condensation product or various additive can be mixed in the molding sand composition, among the phenol resin solution that polycondensation product, various additive is added to other preparation and the either party of polyisocyanate ester solution or two sides and mix, perhaps, it is dissolved or dispersed in the suitable organic solvent, when mixing it is mixed with molding sand together mutually with phenol resin solution and polyisocyanate ester solution, perhaps, add after the condensation when making phenolic resins is finished and mix.Wherein, the present invention preferably adds condensation product in the polyisocyanate ester solution, places certain hour, as 1～3 day, and above-mentioned substance is reacted, and is mixed together with phenol resin solution under this state.
When making the molding sand composition, the phenol resin solution of formation organic binder bond and polyisocyanate ester solution are from mix stages, slowly carry out sudden reaction (urethane reaction), so preparation preparation respectively in advance usually mixes then mutually when mixing with molding sand.And mixing married operation preferably uses continous way identical with existing apparatus or batch sand mixer, carries out in-10～50 ℃ scope.
Then, the molding sand composition that obtains as described above after the metal pattern that possesses desirable shape and so on moulding is in-molded, is fed the catalyst gas that is used to harden, the gas hardening casting mold is made in the sclerosis of promoted type sand composition.As catalyst gas, except that existing known tertiary amine gas such as triethylamine, dimethyl amine, dimethyl isopropylamine, can enumerate ring-type nitrogen compound, pyridine, N-dionin, can suitably select wherein at least a kind, use amount is in common scope.
On the other hand, when utilizing air set method moulding self-hardening property casting mold, the same with above-mentioned gas sclerosis casting mold, at first make the molding sand composition of the surface-coated organic binder bond of molding sand, when mixing hardening catalyst is sneaked into the molding sand composition that is used for the air set method with above-mentioned organic binder bond.As this hardening catalyst, can enumerate base commonly used in the known Ashland method, amine, metal ion etc.
The molding sand mixture that obtains is after sclerosis under the effect of the hardening catalyst that is added, and is in-molded at the metal that possesses required form at once, makes the self-hardening property casting mold.
Need to prove, be used for the preparation of the molding sand composition of above-mentioned gas sclerosis casting mold, self-hardening property casting mold, as the use level of phenol resin solution, polyisocyanate ester solution, preferred employing can make the ratio that is respectively 0.01～5.0 weight portion, preferred 0.1～2.0 weight portion as the use level of the phenolic resins of active ingredient and polyisocyanate compounds with respect to molding sand 100 weight portions.In addition, as the cooperate ratio of phenolic resins with polyisocyanate compounds, being not particularly limited, being used in combination phenol resin solution and polyisocyanate ester solution usually, is phenolic resins: polyisocyanate compounds=80:20～20:80 when it is represented with weight basis.
As the molding sand that uses among the present invention, so long as the fire resistance material of using as casting mold gets final product, can use natural sand or artificial sand, be not particularly limited.For example, can enumerate silica sand, olivine sand, zircon sand, chromium sand, aluminum oxide sand, ferrochrome class slag, ferronickel class slag, converter slag, the artificial particle of mullite class (as, can buy from ITOCHU Ceratech Co., Ltd., commodity are called " Thera Beads ") and their reclaimed sand etc., use wherein a kind of, two or more.Wherein, reclaim the back from casting mold and grind regeneration processing aspect consideration, the preferred spherical good artificial particle of mullite class of anti-brokenness.
Therefore, the gas hardening casting mold that makes as described above, self-hardening property casting mold are when moulding, can prevent scab effectively, simultaneously, also can improve its intensity, thereby the surface fracture that the ejection resistance when having avoided by the demoulding causes, so can be used as the casting that sand molds such as high-precision core are used for the casting produce product that are made of various metals such as aluminium alloy, manganese alloy, iron.
For more specifically describing the present invention, below provide several embodiments of the present invention, any restriction that the present invention is not subjected to embodiment to put down in writing content is self-evident.In addition, the present invention only otherwise break away from purport of the present invention, also can carry out various changes, correction and improvement etc. to the present invention according to those skilled in the art's knowledge except that following embodiment and above-mentioned concrete record.In addition, in the present embodiment, undertaken after the mensuration of scab and the demoulding just and the mould strength after 24 hours is measured by laxative remedy.
The mensuration of scab
In the sand hopper of ice chest moulding machine, after inserting the mixing molding sand composition that obtains, use experiment metal pattern 2 as shown in Figure 1, by the set diameter in its top: the charging of 10mm (blow) mouthfuls 4, depress the described molding sand composition of filling in the charging of 0.4MPa, then, with triethylamine gas under the gauge pressure of 0.05MPa the inflation one second after, in air cleaning under the gauge pressure of 0.1MPa after 15 seconds, from experiment metal pattern 2, take out the formed products (casting mold) of portion's formation within it, repeat molding operation, in the 5th, the 10th time, when finishing for the 15th time and the 20th time, take off the scab evaluation that can be embedded in experiment metal pattern 2 bottoms with sheet metal 6, sheet metal 6 is weighed in advance with freely dismantling, tries to achieve before the experiment and the sheet metal 6 after the experiment of poor quality as scab amount (mg), its numerical value is big more, judge that scab is poor more, in other words, release property is poor more.
Reach the mensuration of the mould strength after 24 hours after the demoulding just
In the sand hopper of ice chest moulding machine, drop into stand-by time after mixing and be the molding sand composition of 0 minute, 60 minutes, 120 minutes and 180 minutes, then this molding sand composition is filled in the metal pattern of bending strength test sheet styling apparatus, then, by in described metal pattern, feeding 2 bending strength test sheets that triethylamine gas is made width 30mm * length 85mm * thickness 10mm.In addition, feed conditions is a pressure: 0.3MPa * time: 3 seconds, the inflationtime of triethylamine and air cleaning condition were respectively pressure: 0.3MPa and time: 10 seconds.The test film that uses small-sized bending compression testing machine: SC200D (high thousand fringes smart machine Co., Ltd.) to measure to obtain thus is described moulding has just been finished after or the bending strength (N/cm after placement in 24 hours
2), the mould strength when the former is the firm demoulding, the latter is the mould strength of the demoulding after 24 hours.Need to prove, except that stand-by time is 0 minute, the molding sand composition of firm mixing back (preparation just), with it in temperature: 20 ℃ * relative humidity: under 60% the environment, in the Polythene Bag, place the stipulated time (60 minutes, 120 minutes, 180 minutes), obtain stand-by time and be 60 minutes～180 minutes molding sand composition.
The preparation of phenol resin solution
Take into account the paraformaldehyde that drops into 100 weight portion phenol, 55.5 weight portions, 92 weight % in the three neck reaction flasks of agitator and 0.32 weight portion lead naphthenate to having return channel, temperature as divalent metal salt, under reflux temperature reaction after 90 minutes heating concentrate, obtain the benzyl ether type phenolic resins of moisture smaller or equal to 1 weight %.Then, the organic solvent of this phenolic resins with DBE:SOLVESSO 100:HAWS=46:48:6 diluted, simultaneously, adding is γ-glycidoxypropyltrimewasxysilane of 0.5 weight % with respect to the phenolic resins use amount, makes the phenol resin solution that phenolic resin content is 50 weight %.
The scab evaluation preparation of compounding ingredient
In following the present invention's example and comparative example, prepare shown in the following table 1 as the various materials of scab evaluation with the compounding ingredient use, its neutralization number, saponification number, iodine number and hydroxyl value are as shown in table 1." K-PON 402,404-S, 406-S, 306 and 180 " in the trade name hurdle of following table 1 is Kokura Synthetic Ind Ltd.'s product.
[table 1]
(embodiment 1 〉
At first, according to the ratio shown in following table 2 and 3, will be as condensation MDI (thick MDI), the IPUSOL 150 (IP150 of polyisocyanate compounds; Organic solvent), going up the scab evaluation shown in the table 1 cooperates with m-phthaloyl chloride with compounding ingredient (material), mix, after preparing various polyisocyanate ester solutions, this polyisocyanate ester solution is stirred two days (48 hours) under 25 ℃ temperature, described polyisocyanate compounds and the scab evaluation that cooperates can react with can react between the compounding ingredient time.
Then, in DALTON Co., Ltd. goods river formula horizontal mixer, drop into 1000 weight portions in advance in temperature: 20 ℃ * relative humidity: phenol resin solution and 10 weight portions that the casting of placing under 60% the atmosphere 24 hours is prepared in advance with (foundry) silica sand, 10 weight portions are combined with various scab evaluations with behind the polyisocyanate ester solution of compounding ingredient, stirred mixing 40 seconds, preparation is coated with the molding sand of the organic binder bond of regulation respectively, in other words is the molding sand composition.
Use resulting various molding sand composition, estimate scab according to above-mentioned experimental method, using standing time simultaneously is the mensuration that 0 minute (firm mixing back), 60 minutes, 120 minutes, 180 minutes casting thing sand composition carry out above-mentioned mould strength, and measurement result is shown in following table 2 and table 3.
[table 2]
[table 3]
Shown in table 2 and table 3, the scab amount of example of the present invention 1～4 that constitutes organic binder bond according to the present invention is few, even and if aspect mould strength standing time elongatedly also have good intensity.Relatively, use when not cooperating the scab evaluation fully with the binding agent shown in the comparative example 1 of compounding ingredient, the scab amount significantly increases, cooperation shown in the comparative example 2,3 and 5 during as the castor oil acid of non-condensation product, 12-hydroxy stearic acid or castor oil acid methyl esters, the effect that the scab amount that can acquire a certain degree reduces, but its effect is insufficient and mould strength is low.And even if when using the condensation product of 12-hydroxy stearic acids as the comparative example 4 of condensation form, anti-scab effect is also insufficient, though or can show to a certain degree anti-scab effect, the problem of existence inherence, mould strength aspect.
＜embodiment 2 〉
According to the ratio shown in the following table 4, add condensation MDI (thick MDI), (IP 150 for IPUSOL 150 as polyisocyanate compounds; Organic solvent), the scab evaluation cooperates with m-phthaloyl chloride with compounding ingredient, mixes, and prepares the polyisocyanate ester solution.
Then, the polyisocyanate ester solution of being prepared was not placed shown in embodiment 1 two days, but after preparation, directly used, similarly to Example 1 the layout type sand composition with the phenol resin solution of preparing in advance.The molding sand composition that use makes carries out scab evaluation and mould strength similarly to Example 1 and measures, and its result is as shown in table 4.
[table 4]
The result of table 4 clearly shows, the example of the present invention 5 of using condensation product of the present invention has shown excellent results aspect scab and the mould strength improving, in contrast, the cooperation of comparative example 6 the scab evaluation beyond the object of the present invention when using compounding ingredient, the scab amount is many, and mould strength and insufficient.
Claims (15)
1, a kind of mould using for organic binder, described mould using for organic binder is used for the moulding of the gas hardening casting mold and the self-hardening property casting mold of phenolic urethane class, it is characterized by, described mould using for organic binder uses phenolic resins, polyisocyanate compounds, organic solvent simultaneously and has the necessary constituent of condensation product conduct of the unrighted acid of alcoholic extract hydroxyl group.
2, the mould using for organic binder of putting down in writing as claim 1, wherein, the neutralization number of described condensation product is below 100 or 100.
3, as claim 1 or 2 mould using for organic binder of being put down in writing, wherein, the condensation degree of described condensation product is more than 1.8 or 1.8.
4, as claim 1 or 2 mould using for organic binder of being put down in writing, wherein, described unrighted acid is a castor oil acid.
5, the mould using for organic binder of putting down in writing as claim 3, wherein, described unrighted acid is a castor oil acid.
6, as each mould using for organic binder of putting down in writing in the claim 1,2,5, this binding agent is to make described condensation product and can react with the compound of wherein residual carboxyl or hydroxyl reaction and be used under the form that forms.
7, the mould using for organic binder of putting down in writing as claim 3, this binding agent are to make described condensation product and can react with the compound of wherein residual carboxyl or hydroxyl reaction and be used under the form that forms.
8, the mould using for organic binder of putting down in writing as claim 4, this binding agent are to make described condensation product and can react with the compound of wherein residual carboxyl or hydroxyl reaction and be used under the form that forms.
9,, wherein, also further contain and prolong agent service life as must constituent as each mould using for organic binder put down in writing in the claim 1,2,5,7,8.
10, the mould using for organic binder of putting down in writing as claim 3 wherein, also further contains and prolongs agent service life as must constituent.
11, the mould using for organic binder of putting down in writing as claim 4 wherein, also further contains and prolongs agent service life as must constituent.
12, the mould using for organic binder of putting down in writing as claim 6 wherein, also further contains and prolongs agent service life as must constituent.
13, a kind of molding sand composition is characterized by, and each mould using for organic binder put down in writing and molding sand in the mixing claim 1～12 of described molding sand composition form.
14, a kind of gas hardening casting mold is to contact with catalyst gas by the molding sand composition that claim 13 is put down in writing, and makes the sclerosis of this molding sand composition and forms.
15, a kind of self-hardening property casting mold, be by in molding sand simultaneously the mould using for organic binder of each record in mixing hardening catalyst and the claim 1～12 form.
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| US20110129387A1 (en) * | 2009-07-16 | 2011-06-02 | Ashland Licensing And Intellectual Property Llc | Foundry binder comprising one or more cycloalkanes as a solvent |
| CN102153972B (en) * | 2011-05-23 | 2013-02-06 | 中国一拖集团有限公司 | Normal temperature quick-drying adhesive for assembling and installing complex core and preparation method |
| CN103635271A (en) * | 2011-07-01 | 2014-03-12 | 亚世科化学有限公司 | Compositions prepared from aldehyde and furfuryl alcohol and their use as binders |
| CN103495699A (en) * | 2013-10-16 | 2014-01-08 | 合肥市田源精铸有限公司 | Molding sand for producing large supercritical cast steel and production method of molding sand |
| CN103878297A (en) * | 2014-03-25 | 2014-06-25 | 宁夏共享集团有限责任公司 | Production method for casting adhesive |
| CN107282869B (en) * | 2017-06-28 | 2019-05-14 | 山西科瑞再生资源综合利用有限公司 | A kind of precoated sand and preparation method thereof |
| JP7306398B2 (en) * | 2018-08-17 | 2023-07-11 | ぺんてる株式会社 | pencil lead |
| CN112404352A (en) * | 2020-11-13 | 2021-02-26 | 广西陆川县威能达热能科技有限公司 | Casting process of health-care inner container of uncoated rustless cast iron electric cooker |
| CN113172199B (en) * | 2021-04-23 | 2023-03-14 | 广西兰科资源再生利用有限公司 | Preparation method of novel ammonia-free curing type casting precoated sand |
| CN113351823B (en) * | 2021-05-26 | 2023-04-28 | 共享新材料(山东)有限公司 | Sand mould reinforcing liquid and preparation and use methods thereof |
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