CN103819859B - A kind of high-foaminess disappearance molding material and preparation method thereof - Google Patents
A kind of high-foaminess disappearance molding material and preparation method thereof Download PDFInfo
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- CN103819859B CN103819859B CN201410077776.3A CN201410077776A CN103819859B CN 103819859 B CN103819859 B CN 103819859B CN 201410077776 A CN201410077776 A CN 201410077776A CN 103819859 B CN103819859 B CN 103819859B
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Abstract
The invention discloses a kind of high-foaming performance polystyrene-methacrylic acid-methyl methacrylate gasification disappearance molding material and preparation method thereof.It adds function monomer methacrylic acid in the preparation process of styrene methyl methacrylate disappearance molding material.Process is as follows: deionized water, styrene monomer, methyl methacrylate monomer, methacrylic acid monomer, dispersion agent, initiator are mixed and carry out suspension polymerization be prepared into bead material; The bead material of preparation is washed, preserves after dry, screening and obtain pre-frothing material; Pre-frothing material, whipping agent, softening agent, surface coating agent and antistatic agent are placed in autoclave foam, insulation, cooling, discharging, washing, high-foaminess disappearance molding material.The volume of unit mass material of the present invention increases greatly, and the economic benefit that improve material decreases the generation of cracked gas, and the favourable workshop condition that improves also mitigates environmental pollution simultaneously.
Description
Technical field
The invention belongs to die casting field, be specifically related to a kind of high-foaming performance polystyrene-methacrylic acid-methyl methacrylate gasification disappearance molding material and preparation method thereof.
Background technology
Lost foam casting (be called for short EPC) is a kind of Near net shape, accurately embarks on journey and easily realize the new technology of cleaner production, is also collection plastics, chemical industry, machinery, is cast into the casting technology systems engineering of comprehensive many science of one.
At the beginning of the eighties, EPC technology starts to be widely used in industrial production, in automobile industry, especially obtain method exhibition at full speed.Simultaneously production practice both domestic and external show the superiority of this technology uniqueness, and EPC process quilt is described as " new technology of 21 century ", " green engineering in casting ".
Polystyrene is also the most frequently used disappearance molding material the earliest, but independent polystyrene does disappearance moldings formed therefrom material there will be " carbon defects " phenomenon when mold thus affect casting quality; Do disappearance moldings formed therefrom material with polymethylmethacrylate, although overcome " carbon defects " problem, make gas forming amount increase thus improve casting difficulty.The comprehensive relative merits of bi-material in disappearance mold above, develop ST-MMA material.Although this kind of material is a kind ofly relatively be applicable to the shaping material of lost foam casting in theory, the foaming condition of this material is harsh and hinder its application in the industry.
Summary of the invention
The object of the invention is, by adding when being polymerized the foaming power that a kind of function monomer improves styrene methyl methacrylate disappearance molding material, to obtain a kind of disappearance molding material improving foam performance.After improving foaming power, the volume of unit mass material increases greatly, and the economic benefit that improve material decreases the generation of cracked gas, and the favourable workshop condition that improves also mitigates environmental pollution simultaneously.
For achieving the above object, adopt technical scheme as follows:
A kind of high-foaminess disappearance molding material, it adds function monomer methacrylic acid in the preparation process of styrene methyl methacrylate disappearance molding material.
By such scheme, be prepared from by the raw material of following parts by weight:
Vinylbenzene (ST) monomer 4 ~ 6 parts, methyl methacrylate (MMA) monomer 8 ~ 12 parts, methacrylic acid (MAA) monomer 4 ~ 6 parts, deionized water 100 ~ 140 parts, dispersion agent 0.5 ~ 2 part, initiator 0.4 ~ 1 part, 0.01 ~ 1 part, softening agent, surface coating agent 0.3 ~ 1 part, antistatic agent 0.01 ~ 1 part, whipping agent C4 ~ C6 lower boiling alkane 1 ~ 3 part.
By such scheme, described dispersion agent is made up of the organic dispersing agent of massfraction 60% ~ 80% and massfraction 40% ~ 20% inorganic dispersant.
By such scheme, described organic dispersing agent is polyvinyl alcohol; Described inorganic dispersant is magnesium basic carbonate.
By such scheme, described initiator is dibenzoyl peroxide.
The preparation method of above-mentioned high-foaminess disappearance molding material, comprises the following steps:
Deionized water, styrene monomer, methyl methacrylate monomer, methacrylic acid monomer, dispersion agent, initiator are mixed and carry out suspension polymerization and is prepared into bead material;
The bead material of preparation is washed, preserves after dry, screening and obtain pre-frothing material;
Pre-frothing material, whipping agent, softening agent, surface coating agent and antistatic agent are placed in autoclave, the lower foaming 6 ~ 10h of pressure 0.65MPa is set, insulation 10 ~ 15h, cooling, discharging, washing, high-foaminess disappearance molding material.
The invention has the beneficial effects as follows: the foam performance of the material of the expandability disappearance mold polystyrene-methacrylic acid-methyl methacrylate prepared due to the present invention improves greatly, the foaming machine that special p-poly-phenyl ethene is foamed also can foam to the material of the present invention's synthesis, is conducive to promoting and favourable previous polystyrene is the reform of foam material enterprise.After improving foaming power, the volume of unit mass material increases greatly, and the economic benefit that improve material decreases the generation of cracked gas, and the favourable workshop condition that improves also mitigates environmental pollution simultaneously.
Embodiment
For further understanding technical solution of the present invention, illustrate in conjunction with the embodiments, but be not limited to following embodiment.
High-foaminess disappearance molding material, the basis of styrene methyl methacrylate disappearance molding material adds function monomer methacrylic acid.The foam performance of the material of the expandability disappearance mold polystyrene-methacrylic acid-methyl methacrylate of preparation improves greatly, and the foaming machine that special p-poly-phenyl ethene is foamed also can foam to the material of the present invention's synthesis.
Above-mentioned high-foaminess disappearance molding material is prepared from by the raw material of following parts by weight:
Vinylbenzene (ST) monomer 4 ~ 6 parts, methyl methacrylate (MMA) monomer 8 ~ 12 parts, methacrylic acid (MAA) monomer 4 ~ 6 parts, deionized water 100 ~ 140 parts, dispersion agent 0.5 ~ 2, initiator 0.4 ~ 1, softening agent 0.01 ~ 1, surface coating agent 0.3 ~ 1, antistatic agent 0.01 ~ 1, whipping agent C4 ~ C6 lower boiling alkane 1 ~ 3 part.
Wherein, dispersion agent is made up of the organic dispersing agent of massfraction 60% ~ 80% and massfraction 40% ~ 20% inorganic dispersant.Organic dispersing agent can be any one or a few the mixing in polyvinyl alcohol, hydroxypropylcellulose, hypromellose, polyvidone; Described inorganic dispersant can be any one or a few the mixture in sodium sulphite, magnesium basic carbonate, wilkinite, talcum powder, calcium carbonate.Optimally embodiment is the mixing of organic dispersing agent polyvinyl alcohol, inorganic dispersant magnesium basic carbonate.
Initiator can be dibenzoyl peroxide, peroxidation carbonic acid-2-ethylhexanate, 1, any one in 1-bis-(tert-butyl peroxide)-3.3.3-trimethyl-cyclohexane, peroxidized t-butyl perbenzoate, dicumyl peroxide.
Softening agent can be in toluene, p-Xylol, m-xylene, o-Xylol, ethylbenzene, propyl benzene, isopropyl benzene any one or several in.
Whipping agent can be any one in butane, Trimethylmethane, Skellysolve A, iso-pentane, neopentane, pentamethylene, hexane.
The preparation process of above-mentioned high-foaminess disappearance molding material is as follows:
Deionized water, styrene monomer, methyl methacrylate monomer, methacrylic acid monomer, dispersion agent, initiator are mixed and carry out suspension polymerization and is prepared into bead material;
The bead material of preparation is washed, preserves after dry, screening and obtain pre-frothing polymer materials;
Pre-frothing material, whipping agent, softening agent, surface coating agent and antistatic agent are placed in autoclave, the lower foaming 6 ~ 10h of pressure 0.65MPa is set, insulation 10 ~ 15h, cooling, discharging, washing, high-foaminess disappearance molding material.
Implementation result shows, disappearance molding material foam performance prepared by the present invention is higher, and after calcination, ash content is less than 1%.Material surface is smooth, good rigidly, intensity are high.Apparent property all meets lost foam casting.
Embodiment 1
In the there-necked flask of 250ml that agitator and condensation reflux unit are housed, add the distilled water of 100 parts, 0.4 part of initiator dibenzoyl peroxide, 0.5 part of dispersion agent, 4 parts of vinylbenzene (ST) monomers, 12 parts of methyl methacrylate (MMA) monomers, 4 parts of function monomer methacrylic acids (MAA) are carried out suspension polymerization and are prepared into bead material.Wherein dispersion agent is massfraction 60% polyvinyl alcohol and the mixing of 40% magnesium basic carbonate.
After completion of the reaction, cool material and with dilute hydrochloric acid carry out washing, filter, dry obtained pre-frothing polymer materials.
Gained pre-frothing polymer materials, the whipping agent of 1.5 parts and the softening agent of 0.01 part, 0.3 part of surface coating agent, 0.01 part of antistatic agent is added in foam device.In autoclave, pressure is the 6h that foams under the condition of 0.65MPa, and insulation 10h, cooling, discharging, washing, obtain Expandable Polystyrene (EPS)-EUDRAGIT L100 bead.
The density of the material after foaming is 14.3kg/m
3, after calcination, ash content is less than 1%.Material surface is smooth, good rigidly, intensity are high.Apparent property all meets lost foam casting.
Embodiment 2
In the there-necked flask of 250ml that agitator and condensation reflux unit are housed, add the distilled water of 140 parts, 1 part of initiator dibenzoyl peroxide, 2 parts of dispersion agents, 6 parts of vinylbenzene (ST) monomers, 8 parts of methyl methacrylate (MMA) monomers, 6 parts of function monomer methacrylic acids (MAA) are carried out suspension polymerization and are prepared into bead material.Wherein dispersion agent is massfraction 80% polyvinyl alcohol and the mixing of 20% magnesium basic carbonate.
After completion of the reaction, cool material and with dilute hydrochloric acid carry out washing, filter, dry obtained pre-frothing polymer materials.
Gained pre-frothing polymer materials, the whipping agent of 2.5 parts and the softening agent of 1 part, 1 part of surface coating agent, 1 part of antistatic agent is added in foam device.In autoclave, pressure is the 6h that foams under the condition of 0.65MPa, and insulation 10h, cooling, discharging, washing, obtain Expandable Polystyrene (EPS)-EUDRAGIT L100 bead.
The density of the material after foaming is 14.5kg/m
3, after calcination, ash content is less than 1%.Material surface is smooth, good rigidly, intensity are high.Apparent property all meets lost foam casting.
Embodiment 3
In the there-necked flask of 250ml that agitator and condensation reflux unit are housed, add the distilled water of 100 parts, 0.4 part of initiator dibenzoyl peroxide, 0.5 part of dispersion agent, 4 parts of vinylbenzene (ST) monomers, 12 parts of methyl methacrylate (MMA) monomers, 4 parts of function monomer methacrylic acids (MAA) are carried out suspension polymerization and are prepared into bead material.Wherein dispersion agent is massfraction 60% polyvinyl alcohol and the mixing of 40% magnesium basic carbonate.
After completion of the reaction, cool material and with dilute hydrochloric acid carry out washing, filter, dry obtained pre-frothing polymer materials.
Gained pre-frothing polymer materials, the whipping agent of 2 parts and the softening agent of 0.01 part, 0.6 part of surface coating agent, 0.5 part of antistatic agent is added in foam device.In autoclave, pressure is the 6h that foams under the condition of 0.65MPa, and insulation 10h, cooling, discharging, washing, obtain Expandable Polystyrene (EPS)-EUDRAGIT L100 bead.
The density of the material after foaming is 14kg/m
3, after calcination, ash content is less than 1%.Material surface is smooth, good rigidly, intensity are high.Apparent property all meets lost foam casting.
Embodiment 4
In the there-necked flask of 250ml that agitator and condensation reflux unit are housed, add the distilled water of 140 parts, 1 part of initiator dibenzoyl peroxide, 2 parts of dispersion agents, 6 parts of vinylbenzene (ST) monomers, 8 parts of methyl methacrylate (MMA) monomers, 6 parts of function monomer methacrylic acids (MAA) are carried out suspension polymerization and are prepared into bead material.Wherein dispersion agent is massfraction 80% polyvinyl alcohol and the mixing of 20% magnesium basic carbonate.
After completion of the reaction, cool material and with dilute hydrochloric acid carry out washing, filter, dry obtained pre-frothing polymer materials.
Gained pre-frothing polymer materials, the whipping agent of 2 parts and the softening agent of 1 part, 0.6 part of surface coating agent, 0.5 part of antistatic agent is added in foam device.In autoclave, pressure is the 6h that foams under the condition of 0.65MPa, and insulation 10h, cooling, discharging, washing, obtain Expandable Polystyrene (EPS)-EUDRAGIT L100 bead.
The density of the material after foaming is 14kg/m
3, after calcination, ash content is less than 1%.Material surface is smooth, good rigidly, intensity are high.Apparent property all meets lost foam casting.
Embodiment 5
In the there-necked flask of 250ml that agitator and condensation reflux unit are housed, add the distilled water of 120 parts, 0.7 part of initiator dibenzoyl peroxide, 1 part of dispersion agent, 5 parts of vinylbenzene (ST) monomers, 10 parts of methyl methacrylate (MMA) monomers, 5 parts of function monomer methacrylic acids (MAA) are carried out suspension polymerization and are prepared into bead material.Wherein dispersion agent is massfraction 70% polyvinyl alcohol and the mixing of 30% magnesium basic carbonate.
After completion of the reaction, cool material and with dilute hydrochloric acid carry out washing, filter, dry obtained pre-frothing polymer materials.
Gained pre-frothing polymer materials, the whipping agent of 2 parts and the softening agent of 0.5 part, 0.6 part of surface coating agent, 0.5 part of antistatic agent is added in foam device.In autoclave, pressure is the 6h that foams under the condition of 0.65MPa, and insulation 10h, cooling, discharging, washing, obtain Expandable Polystyrene (EPS)-EUDRAGIT L100 bead.
The density of the material after foaming is 14kg/m
3, after calcination, ash content is less than 1%.Material surface is smooth, good rigidly, intensity are high.Apparent property all meets lost foam casting.
Comparative example 1
In the there-necked flask of 250ml that agitator and condensation reflux unit are housed, add the distilled water of 120 parts, 0.7 part of initiator dibenzoyl peroxide, 1 part of dispersion agent, 5 parts of vinylbenzene (ST) monomers, 10 parts of methyl methacrylate (MMA) monomers, carry out suspension polymerization and be prepared into bead material.Wherein dispersion agent is massfraction 70% polyvinyl alcohol and the mixing of 30% magnesium basic carbonate.
After completion of the reaction, cool material and with dilute hydrochloric acid carry out washing, filter, dry obtained pre-frothing polymer materials.
Gained pre-frothing polymer materials, the whipping agent of 2 parts and the softening agent of 0.5 part, 0.6 part of surface coating agent, 0.5 part of antistatic agent is added in foam device.In autoclave, pressure is the 6h that foams under the condition of 0.65MPa, and insulation 10h, cooling, discharging, washing, obtain Expandable Polystyrene (EPS)-EUDRAGIT L100 bead.
The density of the material after foaming is 21kg/m
3, after calcination, ash content is greater than 1%.Its implementation result is poor compared with embodiment 5, and what understand function monomer methacrylic acid furtherly adds effect.
Claims (4)
1. a high-foaminess disappearance molding material, is characterized in that preparing by the following method:
Deionized water, styrene monomer, methyl methacrylate monomer, methacrylic acid monomer, dispersion agent, initiator are mixed and carry out suspension polymerization and is prepared into bead material;
The bead material of preparation is washed, preserves after dry, screening and obtain pre-frothing material;
Pre-frothing material, whipping agent, softening agent, surface coating agent and antistatic agent are placed in autoclave, the lower foaming 6 ~ 10h of pressure 0.65MPa is set, insulation 10 ~ 15h, cooling, discharging, washing, high-foaminess disappearance molding material;
Wherein, raw materials used as follows according to weight parts:
Styrene monomer 4 ~ 6 parts, methyl methacrylate monomer 8 ~ 12 parts, methacrylic acid monomer 4 ~ 6 parts, deionized water 100 ~ 140 parts, dispersion agent 0.5 ~ 2 part, initiator 0.4 ~ 1 part, 0.01 ~ 1 part, softening agent, surface coating agent 0.3 ~ 1 part, antistatic agent 0.01 ~ 1 part, whipping agent C4 ~ C6 lower boiling alkane 1 ~ 3 part.
2. high-foaminess disappearance molding material as claimed in claim 1, is characterized in that described dispersion agent is made up of the organic dispersing agent of massfraction 60% ~ 80% and massfraction 40% ~ 20% inorganic dispersant.
3. high-foaminess disappearance molding material as claimed in claim 1, is characterized in that described organic dispersing agent is polyvinyl alcohol; Described inorganic dispersant is magnesium basic carbonate.
4. high-foaminess disappearance molding material as claimed in claim 1, is characterized in that described initiator is dibenzoyl peroxide.
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Families Citing this family (5)
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| CN104311867B (en) * | 2014-10-27 | 2017-11-14 | 武汉工程大学 | A kind of preparation method of catalytic gasification disappearance mold foam |
| CN105199136B (en) * | 2015-11-09 | 2016-09-07 | 潘敦 | The preparation method of a kind of dispellable mould casting bead and thus obtained expandable resin |
| CN106180547B (en) * | 2016-06-29 | 2018-10-26 | 共享装备股份有限公司 | A kind of method that STMMA makes disappearance template material with EPS batch mixings |
| CN110330751A (en) * | 2019-07-16 | 2019-10-15 | 波尔玛(辛集)保温材料有限公司 | A kind of dispellable mould casting expandability gasification mold materials and preparation method thereof |
| CN117164751A (en) * | 2023-09-19 | 2023-12-05 | 池州方达科技有限公司 | Preparation method and preparation system of expandable polymethyl methacrylate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1589185A (en) * | 2001-11-20 | 2005-03-02 | 花王株式会社 | Lost pattern casting method |
| CN103483490A (en) * | 2013-10-08 | 2014-01-01 | 无锡兴达泡塑新材料股份有限公司 | Modified EPS (expandable polystyrene) copolymer particle for lost foam casting and preparation method of modified EPS copolymer particle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1589185A (en) * | 2001-11-20 | 2005-03-02 | 花王株式会社 | Lost pattern casting method |
| CN103483490A (en) * | 2013-10-08 | 2014-01-01 | 无锡兴达泡塑新材料股份有限公司 | Modified EPS (expandable polystyrene) copolymer particle for lost foam casting and preparation method of modified EPS copolymer particle |
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