CN103483490A - Modified EPS (expandable polystyrene) copolymer particle for lost foam casting and preparation method of modified EPS copolymer particle - Google Patents
Modified EPS (expandable polystyrene) copolymer particle for lost foam casting and preparation method of modified EPS copolymer particle Download PDFInfo
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- CN103483490A CN103483490A CN201310463158.8A CN201310463158A CN103483490A CN 103483490 A CN103483490 A CN 103483490A CN 201310463158 A CN201310463158 A CN 201310463158A CN 103483490 A CN103483490 A CN 103483490A
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Abstract
The invention relates to a modified EPS copolymer particle for lost foam casting and a preparation method of the modified EPS copolymer particle. The modified EPS copolymer particle for the lost foam casting is generated by mixing and reacting components of styrene, desalted water, methyl methacrylate, an MBS (methyl methacrylate-butadiene-styrene copolymer) resin, calcium phosphate, benzoyl peroxide, tert-Butyl peroxybenzoate, polyethylene wax, petroleum ether and a surface active agent. The copolymer particle is decomposed to generate a molecular liquid and a gas at the high temperature, carbon residues are not remained in a cavity of a formwork, the content of carbon in a casting can be reduced, and a mechanical property of the casting cannot be influenced.
Description
Technical field
The present invention relates to raw materials for production of a kind of casting mould and preparation method thereof.Specifically, be in castingprocesses, be used for modification Expandable Polystyrene (EPS) copolymerization particle of manufacturing evaporative pattern and preparation method thereof, be specially adapted to the casting of automobile component.
Background technology
Lost foam casting is called again dry sand full mold negative pressure casting, is one of state-of-the-art casting technique in the world at present, is described as once " revolution " on the casting history, is referred to as green casting of 21 century both at home and abroad.
Lost foam casting is to adopt the porous plastics (modal is Expandable Polystyrene (EPS)) of easily vaporization to make apperance, and apperance not only determines shape, the size of foundry goods, and participates in series of physical chemical transformation in casting process.Therefore, the performance of model material becomes the key factor that affects casting quality.Although, adopt Expandable Polystyrene (EPS) carry out lost foam casting with traditional sand mold casting, compare have advantages of a lot, but when teeming temperature is greater than 900 ℃, Expandable Polystyrene (EPS) can decomposes produce in the formwork die cavity after a large amount of carbon slags remains in the apperance disappearance, thereby increased the content of carbon in the foundry goods, made the mechanical property of foundry goods be greatly affected.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of dispellable mould casting modification Expandable Polystyrene (EPS) copolymerization particle, and this copolymerization particle, at high temperature can not decompose the Formed slag, can the mechanical property of foundry goods do not impacted.
Another problem that the present invention will solve is to provide a kind of method for preparing dispellable mould casting modification Expandable Polystyrene (EPS) copolymerization particle.
For addressing the above problem, take following scheme:
Dispellable mould casting modification Expandable Polystyrene (EPS) copolymerization particle of the present invention, is characterized in that comprising the raw material of following parts by weight: 80 ~ 100 parts of vinylbenzene; 100 ~ 120 parts of de-salted waters; 5 ~ 15 parts of methyl methacrylates; 1 ~ 3 part of MBS resin; 1.5 ~ 2.5 parts, calcium phosphate; 0.3 ~ 0.5 part of benzoyl peroxide; 0.1 ~ 0.3 part of peroxidized t-butyl perbenzoate; 0.1 ~ 0.3 part of polyethylene wax; 5 ~ 7 parts of sherwood oils; 0.2 ~ 0.4 part, tensio-active agent.Described MBS resin is the MBS terpolymer.
Wherein: the viscosity of described methyl methacrylate in the time of 20 ℃ is 0.6cP, and moment of dipole is 1.6 ~ 1.97D; Described MBS resin is white powder, its 40 order percent of pass >=98%, fugitive constituent≤1.5%; Described polyethylene wax is granular or pulverous low-molecular-weight polyolefine, its molecular weight ranges between 1000 ~ 3500, molecular weight dispersion index≤2.0; Described tensio-active agent is glycerol stearate.
The method for preparing dispellable mould casting modification Expandable Polystyrene (EPS) copolymerization particle comprises the following steps successively:
First de-salted water is poured in reactor, in uniform stirring, add successively calcium phosphate, vinylbenzene, methyl methacrylate, MBS resin (MBS terpolymer), benzoyl peroxide, peroxidized t-butyl perbenzoate, polyethylene wax, and according to the heat-up rate of 0.5-1.0 ℃/minute, reactor is heated; When temperature rises to 85 ~ 90 ℃, constant temperature keeps 400 ~ 520 minutes, and making material shape become particle diameter is 16 ~ 40 purpose particles;
Afterwards, add sherwood oil, and continue reactor is heated, make the temperature of reactor reach 120 ~ 130 ℃, pressure and reach 0.60 ~ 0.70MPa, and keep 300 ~ 420 minutes under this temperature and pressure;
Afterwards, stop heating, adopt the chuck method of cooling to be lowered the temperature to reactor, the temperature of charge in reactor is down to below 40 ℃;
Afterwards, adopt centrifugal filter to be filtered material, the moisture content in the filtering material, and with hot air flow, filtered material is carried out to drying treatment;
Finally, add tensio-active agent, and carry out uniform stirring, obtain being suitable for the modification Expandable Polystyrene (EPS) copolymerization particle of automotive casting evaporative pattern purposes.
Take such scheme, have the following advantages:
Dispellable mould casting modification Expandable Polystyrene (EPS) copolymerization particle of the present invention is to be made by vinylbenzene, de-salted water, methyl methacrylate, MBS resin (MBS terpolymer), calcium phosphate etc., owing to containing the raw materials such as methyl methacrylate and MBS resin, make the structure of polymkeric substance that change occur.The acrylate chain link is at high temperature that zip mode decomposes, and it easily generates low molecular liquids and gases, easily draws, can be not residual in the formwork die cavity, thus can lower the content of carbon in foundry goods, can not affect the mechanical property of foundry goods.In addition, that selects MBS resin (MBS terpolymer) also can improve prepared by apperance melts knot performance and rigidity, thereby improves the surface smoothness of foundry goods.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment mono-
Choose the vinylbenzene of 80 parts, 5 parts of de-salted water, methyl methacrylates, the MBS(methacrylic methyl esters-divinyl-styrene resin of 100 parts) 1 part, the calcium phosphate of 1.5 parts, the benzoyl peroxide of 0.3 part, the peroxidized t-butyl perbenzoate of 0.1 part, the polyethylene wax of 0.1 part, the sherwood oil of 5 parts, the tensio-active agent of 0.2 part.Wherein, described tensio-active agent is glycerol stearate.
First de-salted water is poured in reactor, in uniform stirring, add successively calcium phosphate, vinylbenzene, methyl methacrylate, MBS(methacrylic methyl esters-divinyl-styrene resin), benzoyl peroxide, peroxidized t-butyl perbenzoate, polyethylene wax, and according to the heat-up rate of 0.5-1.0 ℃/minute, reactor is heated.When temperature rises to 85 ℃, constant temperature keeps 400 minutes, and making material shape become particle diameter is 40 ~ 16 purpose particles.
Afterwards, add sherwood oil, and continue reactor is heated, make the temperature of reactor reach 120 ℃, pressure and reach 0.60MPa, and keep 300 minutes under this temperature and pressure.
Afterwards, stop heating, adopt the chuck method of cooling to be lowered the temperature to reactor, make the temperature of charge in reactor be down to 40 ℃.
Afterwards, adopt centrifugal filter to be filtered material, the moisture content in the filtering material, and with hot air flow, filtered material is carried out to drying treatment.
Finally, add 0.2 part of glycerol stearate, and carry out uniform stirring, obtain being applicable to the modification expandable polystyrene particle of foundry applications.
Embodiment bis-
Choose the vinylbenzene of 90 parts, 10 parts of de-salted water, methyl methacrylates, the MBS(methacrylic methyl esters-divinyl-styrene resin of 110 parts) 2 parts, the calcium phosphate of 2 parts, the benzoyl peroxide of 0.4 part, the peroxidized t-butyl perbenzoate of 0.2 part, the polyethylene wax of 0.2 part, the sherwood oil of 6 parts, the tensio-active agent of 0.3 part.Wherein, described tensio-active agent is glycerol stearate.
First de-salted water is poured in reactor, in uniform stirring, add successively calcium phosphate, vinylbenzene, methyl methacrylate, MBS(methacrylic methyl esters-divinyl-styrene resin), benzoyl peroxide, peroxidized t-butyl perbenzoate, polyethylene wax, and according to the heat-up rate of 0.5-1.0 ℃/minute, reactor is heated.When temperature rises to 85 ℃, constant temperature keeps 460 minutes, and making material shape become particle diameter is 40 ~ 16 purpose particles.
Afterwards, add sherwood oil, and continue reactor is heated, make the temperature of reactor reach 125 ℃, pressure and reach 0.65MPa, and keep 360 minutes under this temperature and pressure.
Afterwards, stop heating, adopt the chuck method of cooling to be lowered the temperature to reactor, make the temperature of charge in reactor be down to 40 ℃.
Afterwards, adopt centrifugal filter to be filtered material, the moisture content in the filtering material, and with hot air flow, filtered material is carried out to drying treatment.
Finally, add 0.3 part of glycerol stearate, and carry out uniform stirring, obtain being applicable to the modification expandable polystyrene particle of foundry applications.
Embodiment tri-
Choose the vinylbenzene of 100 parts, 15 parts of de-salted water, methyl methacrylates, the MBS(methacrylic methyl esters-divinyl-styrene resin of 120 parts) 3 parts, the calcium phosphate of 2.5 parts, the benzoyl peroxide of 0.5 part, the peroxidized t-butyl perbenzoate of 0.3 part, the polyethylene wax of 0.3 part, the sherwood oil of 7 parts, the tensio-active agent of 0.4 part.Wherein, described tensio-active agent is glycerol stearate.
First de-salted water is added in reactor, in uniform stirring, add successively calcium phosphate, vinylbenzene, methyl methacrylate, MBS(methacrylic methyl esters-divinyl-styrene resin), benzoyl peroxide, peroxidized t-butyl perbenzoate, polyethylene wax, and according to the heat-up rate of 0.5-1.0 ℃/minute, reactor is heated.When temperature rises to 90 ℃, constant temperature keeps 520 minutes, and making material shape become particle diameter is 40 ~ 16 purpose particles.
Afterwards, add sherwood oil, and continue reactor is heated, make the temperature of reactor reach 130 ℃, pressure and reach 0.70MPa, and keep 420 minutes under this temperature and pressure.
Afterwards, stop heating, adopt the chuck method of cooling to be lowered the temperature to reactor, make the temperature of charge in reactor be down to 40 ℃.
Afterwards, adopt centrifugal filter to be filtered material, the moisture content in the filtering material, and with hot air flow, filtered material is carried out to drying treatment.
Finally, add 0.4 part of glycerol stearate, and carry out uniform stirring, obtain being applicable to the modification expandable polystyrene particle of foundry applications.
Claims (6)
1. dispellable mould casting modification Expandable Polystyrene (EPS) copolymerization particle is characterized in that comprising the raw material of following parts by weight:
80 ~ 100 parts of vinylbenzene;
100 ~ 120 parts of de-salted waters;
5 ~ 15 parts of methyl methacrylates;
1 ~ 3 part of MBS resin;
1.5 ~ 2.5 parts, calcium phosphate;
0.3 ~ 0.5 part of benzoyl peroxide;
0.1 ~ 0.3 part of peroxidized t-butyl perbenzoate;
0.1 ~ 0.3 part of polyethylene wax;
5 ~ 7 parts of sherwood oils;
0.2 ~ 0.4 part, tensio-active agent;
Wherein, described MBS resin is the MBS terpolymer.
2. dispellable mould casting modification Expandable Polystyrene (EPS) copolymerization particle as claimed in claim 1, is characterized in that the viscosity of described methyl methacrylate in the time of 20 ℃ is 0.6cP, and moment of dipole is 1.6 ~ 1.97D.
3. dispellable mould casting modification Expandable Polystyrene (EPS) copolymerization particle as claimed in claim 1, is characterized in that described MBS resin is white powder, its 40 order percent of pass >=98%, fugitive constituent≤1.5%.
4. dispellable mould casting modification Expandable Polystyrene (EPS) copolymerization particle as claimed in claim 1, it is characterized in that described polyethylene wax is granular or pulverous low-molecular-weight polyolefine, its molecular weight ranges between 1000 ~ 3500, molecular weight dispersion index≤2.0.
5. dispellable mould casting modification Expandable Polystyrene (EPS) copolymerization particle as claimed in claim 1, is characterized in that described tensio-active agent is glycerol stearate.
6. prepare the method for dispellable mould casting modification Expandable Polystyrene (EPS) copolymerization particle claimed in claim 1, it is characterized in that comprising the following steps successively:
First de-salted water is poured in reactor, in uniform stirring, add successively calcium phosphate, vinylbenzene, methyl methacrylate, MBS resin (MBS terpolymer), benzoyl peroxide, peroxidized t-butyl perbenzoate, polyethylene wax, and according to the heat-up rate of 0.5-1.0 ℃/minute, reactor is heated; When temperature rises to 85 ~ 90 ℃, constant temperature keeps 400 ~ 520 minutes, and making material shape become particle diameter is 16 ~ 40 purpose particles;
Afterwards, add sherwood oil, and continue reactor is heated, make the temperature of reactor reach 120 ~ 130 ℃, pressure and reach 0.60 ~ 0.70MPa, and keep 300 ~ 420 minutes under this temperature and pressure;
Afterwards, stop heating, adopt the chuck method of cooling to be lowered the temperature to reactor, the temperature of charge in reactor is down to below 40 ℃;
Afterwards, adopt centrifugal filter to be filtered material, the moisture content in the filtering material, and with hot air flow, filtered material is carried out to drying treatment;
Finally, add tensio-active agent, and carry out uniform stirring, obtain being suitable for the modification Expandable Polystyrene (EPS) copolymerization particle of automotive casting evaporative pattern purposes.
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Cited By (1)
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| CN103819859A (en) * | 2014-03-05 | 2014-05-28 | 武汉工程大学 | High-foaming expendable casting material and preparation method thereof |
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| CN102766230A (en) * | 2012-08-01 | 2012-11-07 | 华啸威 | Expandable phenylethylene copolymer bead with heat-resistant performance and preparation method thereof |
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| JP2003205925A (en) * | 2002-01-11 | 2003-07-22 | Kanegafuchi Chem Ind Co Ltd | Foamed polystyrene resin container |
| CN1422878A (en) * | 2002-04-16 | 2003-06-11 | 杭州余杭亚太化工有限公司 | New-type expandable copolymer resin and preparation method thereof |
| CN101835828A (en) * | 2007-10-26 | 2010-09-15 | 巴斯夫欧洲公司 | Elastic expandable styrene polymer having low thermal conductivity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103819859A (en) * | 2014-03-05 | 2014-05-28 | 武汉工程大学 | High-foaming expendable casting material and preparation method thereof |
| CN103819859B (en) * | 2014-03-05 | 2016-02-24 | 武汉工程大学 | A kind of high-foaminess disappearance molding material and preparation method thereof |
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Application publication date: 20140101 |