CN101289521B - Method for preparing spherical polystyrol of low volatile - Google Patents
Method for preparing spherical polystyrol of low volatile Download PDFInfo
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- CN101289521B CN101289521B CN2007100110069A CN200710011006A CN101289521B CN 101289521 B CN101289521 B CN 101289521B CN 2007100110069 A CN2007100110069 A CN 2007100110069A CN 200710011006 A CN200710011006 A CN 200710011006A CN 101289521 B CN101289521 B CN 101289521B
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Abstract
The invention relates to the reutilization of wasted EPS, in particular to a method for making spherical polystyrene with low volatility. The method comprises the following steps that: the spherical polystyrene obtained by a suspension method to recycle EPS is taken as a raw material and put into a reaction kettle, 0 to 30 percent in weight concentration of high boiling point substance water solution and a dispersing agent are added and are stirred as well as are heated up to a temperature of between 75 and 100 DEG C, the high boiling point substance is added complementally, the ratio by weight of the mixture of water and the high boiling point substance inside the reaction kettle and the raw material particles is more than or equal to 0.8, the material is heated up to the temperature of between 130 and 190 DEG C and is maintained at the temperature for 4 to 48 hours, and the spherical polystyrene with low volatility is obtained. The spherical polystyrene has the advantages of low solvent content and low water content, and the obtained particles can become the EPS after soaked by a sponging agent.
Description
Technical field
The present invention relates to the recycling of depleted Expandable Polystyrene (EPS), specifically reclaiming depleted Expandable Polystyrene (EPS) gained spherical polystyrol with a kind of suspension method is that raw material passes through to heat in certain density high boiling substance, solvent contained in the particle and water are taken off, and the method for spherical polystyrol of low volatile.
Background technology
Expandable Polystyrene (EPS) EPS (Expandable Polystyrene) has buffering shock resistance, resistance to deterioration and the water-repellancy of excellent heat insulation property, uniqueness as a kind of thermoplastic foam, is widely used in a lot of fields.The use of eps foam plastics is very of short duration, mostly be consumption hand in after promptly abandon, the performance of its material itself is not suffered serious destruction as yet, particularly as macromolecular material, the structure of its molecular compound remains intact, and this has just established theoretical basis for recycling.The approach of recycling the depleted Expandable Polystyrene (EPS) is a lot: as extruding pelletization, system novel light building materials, dissolving system coating or binding agent, thermo-cracking is shaped on machine solvent or oil fuel, make Expandable Polystyrene (EPS) (EPS) bead etc. again, above method can both be recycled the depleted Expandable Polystyrene (EPS).In these methods, making Expandable Polystyrene (EPS) again is to utilize reasonable method the most.
Existing suspension method reclaims the technology of Expandable Polystyrene (EPS), its process is: the depleted Expandable Polystyrene (EPS) of collecting is removed mechanical impurity, suitably broken, drop in the dissolving vessel, add organic solvent in proportion, stir the companion it fully dissolved, separating impurity or add filtration adjuvant, finishing agent etc. filter the polystyrene clear liquid.Add dispersion medium water in reactor, suspension agent and disperser (or gradation adding) starts stirring, be warming up to solvent and below the water azeotropic point, in proportion the polystyrene clear liquid added in the reactor continuous the stirring, insulation at a certain temperature, progressively form the spherical particle of polystyrene, cooling discharge filters, washs, dries, get the PS bead, also there is pair particle to handle again, as 50～60 ℃ of vacuum-dryings, or 110 ℃ of Rotary dryings.
The existing resulting product subject matter of technology is: the solvent in the particle and the content of water are than higher, solvent and water-content are all greater than 0.5%, the total content of solvent and water is usually between 2～10%, flood this particle with whipping agent and get Expandable Polystyrene (EPS), though the Expandable Polystyrene (EPS) of gained can foam, but because solvent in the particle and water are very big to the foaming influence, when sending material in advance, shrink very big, subside during moulding, can't use existing Expandable Polystyrene (EPS) prefoaming machine and molding device, therefore existing recovery technology does not have industrial value.With vinylbenzene is in the industrial production of raw material, in the spherical polystyrol of suspension polymerization gained, the content of styrene monomer and water all requires less than 0.5%, (effect of styrene monomer and solvent action are similar when foaming) otherwise can not get qualified Expandable Polystyrene (EPS) with the method for flooding.
Existing suspension method reclaims the technology of Expandable Polystyrene (EPS) after forming the spherical particle of polystyrene, even continue heating in original system, the solvent in the particle also can not be less than 0.5%; Isolating particle from system is handled again; as 50～60 ℃ of vacuum-dryings; or 110 ℃ of Rotary dryings; because treatment temp is low; solvent in the particle also can't be less than 0.5%; why treatment temp can't be higher than 115 ℃ is because of the rising along with temperature; the spherical particle of polystyrene can become very soft; the solvent of granule interior and the dividing potential drop of water also can raise simultaneously simultaneously, under the acting in conjunction of these two factors, and can be under a certain temperature; make granule interior form bubble; and discharge its inner solvent and water comes out, thus what obtain is the particle that abscess is arranged, the method that such particle can't be used to flood obtains qualified Expandable Polystyrene (EPS).
Summary of the invention
For overcoming the deficiencies in the prior art, the object of the present invention is to provide a kind of is the preparation method that raw material obtains the spherical polystyrol of low volatile with suspension method recovery Expandable Polystyrene (EPS) gained spherical polystyrol.
For achieving the above object, scheme provided by the present invention is:
Principle of the present invention is: utilize water and alcohols material to form alcohol solution, by simple distillation, steam the water of volatile components in the alcohol solution, and the boiling point in the reactor is raise gradually, water can effectively suppress solvent and evaporation of water speed in the particle in evaporative process, thereby in the steady while of intensification that guarantees material, guarantee that solvent and water evaporation in the particle are steady, can not form abscess in granule interior; In liquid medium, under the effect of stirring and dispersion agent, can keep the form of particulate separation and ball simultaneously.
A kind of preparation method of spherical polystyrol of low volatile, it is characterized in that: the spherical polystyrol raw material of the Expandable Polystyrene (EPS) gained that suspension method is reclaimed, be contained in the reactor, the aqueous solution and the dispersion agent that add weight concentration 0-30% high boiling substance in the reactor, stir, be heated to 75～100 ℃, then restock adds the aqueous solution of high boiling substance or high boiling substance, and weight ratio 〉=0.8 of the interior water of assurance reactor and high boiling substance mixture and feed particles, heat up, make material reach 130～190 ℃, and constant temperature continues 4～48 hours under this temperature, promptly obtains the spherical polystyrol of low volatile;
Wherein: count by weight, feed particles is 1: 0.8～12 with the aqueous solution ratio of weight concentration 0-30% high boiling substance; Described dispersion agent is a kind of or its combination in inorganic dispersant, tensio-active agent, the macromolecular compound; When adding inorganic dispersant, it accounts for 0.05～30% of feed particles weight; When adding the surfactant-dispersed agent, it accounts for 0.05～20% of feed particles weight; When adding the macromolecular compound dispersion agent, it accounts for 0.05～5% of feed particles weight; Described high boiling substance is a boiling point at 140～500 ℃ water soluble dihydric alcohol, polyvalent alcohol or their mixture; Wherein, the final addition of high boiling substance is for counting by weight, and feed particles is 1: 1～12 with the high boiling substance ratio.
Described raw material can be and adopts suspension method to reclaim the glomeration polystyrene of separating by solid-liquid separating method in the process of Expandable Polystyrene (EPS) from reactor, and the weight of solvent content in the spherical polystyrol raw material is 0.5-20%; Or adopt suspension method to reclaim in the process of Expandable Polystyrene (EPS), the intragranular solvent 0.5-20% of spherical polystyrol, temperature of reaction kettle is at 75～100 ℃, the glomeration polystyrene of not separating by solid-liquid separating method from reactor, promptly suspension method reclaims the system of Expandable Polystyrene (EPS) end as of the present invention initial.
The speed of the heat-up rate of material is to not influence of quality product, if in the temperature-rise period material in the reactor to take material out of reactor just impassable because of evaporation of water.
In reaction process, can feed gas above the reaction system liquid level or below the liquid level, feed gas and help steaming of volatile matter, wherein feed gas and can be: nitrogen or air, as long as the control material is not gone out reactor.
Can be in reaction process in the negative pressure system, negative pressure helps steaming of volatile matter, as long as to take material out of reactor just impassable because of evaporation of water for the control material.
The aqueous solution of described high boiling substance or high boiling substance can add continuously, intermittent type adds, or disposable adding, wherein, concentration when the high boiling substance aqueous solution in the reaction system) 30% the time, the high boiling substance aqueous solution and feed particles weight ratio want 〉=1, and described high boiling substance is water soluble dihydric alcohol, polyvalent alcohol or their mixture, polyvalent alcohol is trivalent alcohol or tetravalent alcohol, as ethylene glycol, polyoxyethylene glycol, propylene glycol, glycerol, tetramethylolmethane.
Described inorganic dispersant is: magnesium basic carbonate, magnesium hydroxide, calcium phosphate powder, silicate, zinc oxide, lime carbonate, barium carbonate, caoxalate, barium sulfate, aluminium hydroxide or zinc sulphide; Tensio-active agent is: sodium alkyl benzene sulfonate, alkylsurfuric acid acid sodium, sulfonate type anionic fluorinated surfactant, fluoroalkyl oxyethyl group ether alcohol nonionogenic tenside, polyether surfactant, polyethylene glycols nonionogenic tenside, tween series, sapn series; Macromolecular compound is: the sodium salt of the multipolymer of the sodium salt of the sodium salt of the sodium salt of maleic anhydride and styrol copolymer, maleic anhydride and ethyl acetate copolymer, methylene-succinic acid and styrol copolymer, methylene-succinic acid and ethyl acetate, the sodium salt of acrylate copolymer, the sodium salt of methacrylate polymer, Polyvinylpyrolidone (PVP), phenolic aldehyde and urea aldehyde polycondensate, polyvinyl alcohol, gelatin or ether of cellulose.
The advantage that the present invention had:
1. the content of solvent and water does not have bubble all less than 0.5% in the spherical polystyrol of gained of the present invention in the particle, can obtain qualified Expandable Polystyrene (EPS) with the method for dipping.
2. the Expandable Polystyrene (EPS) of the impregnated with particles gained that obtains of the present invention can substitute the Expandable Polystyrene (EPS) that makes with the styrene suspension polymerization fully, can use existing Expandable Polystyrene (EPS) foam production equipment to carry out the production of foaming product.
3. used dispersion agent can guarantee that particle do not form bulk because of softening in medium among the present invention, and is to recycle.
4. used high boiling substance recycles with regard to recyclable by simple methods such as solid-liquid separation and washing granules among the present invention.
5. the particle of gained of the present invention obtains qualified Expandable Polystyrene (EPS) with the method for flooding, and is the very big Chemicals of a kind of consumption, is a product the most promising that reclaims the depleted Expandable Polystyrene (EPS).
Embodiment
The present invention adds the particle of entry and suspension method recovery gained in reactor, add dispersion agent, start stirring, heat up to reactor, the aqueous solution that adds high boiling substance or high boiling substance, continue to heat up, constant temperature certain hour after the arrival certain temperature just can obtain the qualified granules of polystyrene of solvent and water-content.To help shortening the treatment time at the certain gas of square tube above the reactor liquid level or under the liquid level, certain negative pressure also is favourable.
The aqueous solution of high boiling substance of the present invention or the high boiling substance mode that adds can be that successive also can be segmentation intermittence, or disposable adding.The high boiling substance concentration that adds can also can be low than the concentration height in the reactor material.After handling particle for the first time, adopt screen filtration to separate particle and high boiling substance, reclaim high boiling substance after washing particle with water, obtain the high boiling substance aqueous solution.The dispersion agent that reclaims polystyrene when suspension method also can provide under the situation of dispersion force during at high temperature, the present invention also can be chosen in particle in the suspension method removal process so has certain degree of hardness (solvent in the spherical polystyrol raw material is less than 20%) and temperature in the time of 75～100 ℃, adds the aqueous solution of high boiling substance or high boiling substance.
Embodiment 1
In 1 liter reactor, add the granules of polystyrene that gained is reclaimed in 200 gram suspensions, at this moment the weight content 12% of solvent in the spherical polystyrol, add 600 gram water, 2 gram magnesium basic carbonates stir, be warmed up to 95 ℃ after, the 600 gram glycerol that slowly add room temperature, the adding method is to keep liquid level constant, is warmed up to 190 ℃, constant temperature 4 hours in 8 hours, promptly obtain the spherical polystyrol of low volatile, the weight content 0.1% of weight of solvent content 0.2% and water in the polystyrene.
Embodiment 2
In 1 liter reactor, add 100 gram suspensions and reclaim the granules of polystyrene of gained, the weight content 10% of solvent in this moment spherical polystyrol, polyoxyethylene glycol (400) the 130 gram water that add concentration 5%, the Sodium dodecylbenzene sulfonate of 4 gram calcium phosphate powders and 10 grams 1%, stir, after being warmed up to 95 ℃, the 600 gram polyoxyethylene glycol (400) that add 95 ℃, temperature rise rate is per hour 2 ℃, temperature is raised to 130 ℃, constant temperature, lead to dry air constant temperature 48 hours, and promptly obtained the spherical polystyrol of low volatile, the weight content 0.2% of weight of solvent content 0.48% and water in the polystyrene.
Embodiment 3
Meter adds the dispersion medium pure water in 1 liter reactor by weight proportion, suspension agent PVA liquid, and polyoxyethylene nonylphenol ether and salting-out agent NaCl, wherein, pure water: 1%PVA liquid: OP: NaCl: PS glue=100: 5: 0.2: 1: 30; Start stirring, be warming up to 62 ℃ in the 30min, getting clearly by weight proportion, PS solution (containing polystyrene 200 grams) adds in the reactor, constantly stir, be warming up to 80 ℃ in the 30min, cross 30min and be warming up to 90 ℃ again, insulation 4h, progressively form the EPS bead after (this process is that suspension method reclaims Expandable Polystyrene (EPS) technology), the weight content 18% of solvent in this moment spherical polystyrol, after being warmed up to 95 ℃, add 700 gram glycerol, the adding method is to keep liquid level not to be higher than 85%, 10 hour temperature of still to be raised to 130 ℃, open negative pressure system, the control material does not get final product towards reactor, and negative pressure is constant in-0.95～0.98Mpa, constant temperature 24 hours, promptly obtain the spherical polystyrol of low volatile, the weight content 0.2% of weight of solvent content 0.43% and water in the polystyrene.
Embodiment 4
In 1 liter reactor, the particle that adds 200 gram suspension gained, the weight content 8% of solvent in this moment spherical polystyrol, add 180 gram water, 2 gram magnesium basic carbonates, stir, after being warmed up to 95 ℃, once add 100 ℃ of 400 gram glycerol, temperature was raised to 130 ℃ in 5 hours, constant temperature 1 hour, material cools to 105 ℃, constant temperature reclaims to such an extent that 30% rare glycerin solution 1000 restrains when adding the washing granules of polystyrene, the adding method is to keep liquid level not to be higher than still at the uniform velocity to be warmed up to 110 ℃ in high 85%, 10 hour, at the uniform velocity be warmed up to 160 ℃ in 5 hours, constant temperature 8 hours promptly obtains the spherical polystyrol of low volatile, the weight content 0.2% of weight of solvent content 0.35% and water in the polystyrene.
Embodiment 5
In 1 liter reactor, add the particle of 200 gram suspension gained, at this moment the weight content 4% of solvent in the spherical polystyrol, add 200 gram water, 2 gram magnesium basic carbonates stir, after being warmed up to 95 ℃, once add 100 ℃ of 400 gram glycerol, temperature was raised to 130 ℃ in 5 hours, constant temperature 1 hour, at the uniform velocity be warmed up to 160 ℃ in 5 hours, constant temperature 8 hours promptly obtains the spherical polystyrol of low volatile, the weight content 0.2% of weight of solvent content 0.35% and water in the polystyrene.
Embodiment 6
In 1 liter reactor, add 100 gram suspensions and reclaim the granules of polystyrene of gained, the weight content 9% of solvent in this moment spherical polystyrol, the glycerol 130 gram aqueous solution that add concentration 5%, the maleic anhydride of 10 grams 1% and the sodium salt of styrol copolymer, stir, after being warmed up to 95 ℃, the 600 gram glycerol that add 95 ℃, temperature rise rate is per hour 3 ℃, temperature is raised to 130 ℃, constant temperature, lead to dry air constant temperature 48 hours, and promptly obtained the spherical polystyrol of low volatile, the weight content 0.2% of weight of solvent content 0.45% and water in the polystyrene.
Embodiment 7
In 1 liter reactor, the particle that adds 50 gram suspension gained, the weight content 9% of solvent in the spherical polystyrol adds 100 gram water at this moment, 10 grams, 1% Polyvinylpyrolidone (PVP), stir, be warmed up to 95 ℃ after, adds 80 ℃ 600 and restrains glycerol, the control heating medium and the reaction mass temperature difference are 20 ℃ and are warmed up to 165 ℃, constant temperature 14 hours promptly obtains the spherical polystyrol of low volatile, the weight content 0.2% of weight of solvent content 0.32% and water in the polystyrene.
Embodiment 8
In 1 liter reactor, add the particle of 200 gram suspension gained, at this moment the weight content 4% of solvent in the spherical polystyrol, add 200 gram water, 10 grams, 5% sodium alkyl benzene sulfonate stirs, be warmed up to 95 ℃ after, add 100 ℃ of 200 gram glycerol, at the uniform velocity be warmed up to 110 ℃ in 10 hours, add 110 ℃ of 200 gram glycerol and at the uniform velocity be warmed up to 160 ℃ in 5 hours, constant temperature 8 hours, promptly obtain the spherical polystyrol of low volatile, the weight content 0.2% of weight of solvent content 0.38% and water in the polystyrene.
Embodiment 9
In 1 liter reactor, the particle that adds 100 gram suspension gained, the weight content 7% of solvent in this moment spherical polystyrol, add 80 gram water, 1 gram magnesium basic carbonate, stir, after being warmed up to 95 ℃, add 100 ℃ of 600 gram glycerol and (contain 5 gram magnesium basic carbonates, dispersion agent in the glycerol is repeatedly the round-robin result), at the uniform velocity be warmed up to 150 ℃ in 10 hours, constant temperature 10 hours, promptly obtain the spherical polystyrol of low volatile, the weight content 0.2% of weight of solvent content 0.3% and water in the polystyrene.
Embodiment 10
In 1 liter reactor, the particle that adds 300 gram suspension gained, the weight content 10% of solvent in this moment spherical polystyrol, add 300 gram water, 50 gram glycerol (contain 2 gram magnesium basic carbonates, dispersion agent in the glycerol is repeatedly the result of circulative accumulation), stir, after being warmed up to 95 ℃, add 90 ℃ of 200 gram glycerol and (contain 8 gram magnesium basic carbonates, dispersion agent in the glycerol is repeatedly the result of circulative accumulation), the temperature difference is 30 ℃ in control heating medium and the still, and material adds 200 gram glycerol in the time of 107 ℃, be warmed up to 165 ℃, constant temperature 8 hours promptly obtains the spherical polystyrol of low volatile, the weight content 0.2% of weight of solvent content 0.34% and water in the polystyrene.
Claims (9)
1. the preparation method of the spherical polystyrol of a low volatile, it is characterized in that: the spherical polystyrol of the Expandable Polystyrene (EPS) gained that suspension method is reclaimed is a raw material, be contained in the reactor, the aqueous solution and the dispersion agent that add weight concentration 0-30% high boiling substance in the reactor, stir, be heated to 75～100 ℃, then restock adds the aqueous solution of high boiling substance or high boiling substance, heat up, make material reach 130～190 ℃, and constant temperature continues 4～48 hours under this temperature, promptly obtains the spherical polystyrol of low volatile; Described low volatile is meant solvent in the spherical polystyrol＜0.5%, moisture content＜0.5%;
Wherein: count by weight, feed particles is 1: 0.8～12 with the aqueous solution ratio of weight concentration 0-30% high boiling substance; Described dispersion agent is a kind of or its combination in inorganic dispersant, tensio-active agent, the macromolecular compound; When adding inorganic dispersant, it accounts for 0.05～30% of feed particles weight; When adding the surfactant-dispersed agent, it accounts for 0.05～20% of feed particles weight; When adding the macromolecular compound dispersion agent, it accounts for 0.05～5% of feed particles weight; Described high boiling substance is a boiling point at 140～500 ℃ water soluble dihydric alcohol, polyvalent alcohol or their mixture; Wherein, count by weight, the final addition of high boiling substance is feed particles: high boiling substance=1: 1～12.
2. press the preparation method of the spherical polystyrol of the described low volatile of claim 1, it is characterized in that: described raw material is a raw material for adopting suspension method to reclaim the glomeration polystyrene of separating by solid-liquid separating method in the process of Expandable Polystyrene (EPS) from reactor, and the weight of solvent content in the spherical polystyrol raw material is 0.5-20%.
3. press the preparation method of the spherical polystyrol of the described low volatile of claim 1, it is characterized in that: described raw material reclaims in the process of Expandable Polystyrene (EPS) for adopting suspension method, the intragranular solvent 0.5-20% of spherical polystyrol, temperature of reaction kettle is at 75～100 ℃, the glomeration polystyrene of not separating by solid-liquid separating method from reactor is a raw material, and promptly suspension method reclaims the initial system of the system of Expandable Polystyrene (EPS) end as present method.
4. press the preparation method of the spherical polystyrol of the described low volatile of claim 1, it is characterized in that: in reaction process, feeding gas above the reaction system liquid level or below the liquid level, feed gas and help steaming of volatile matter, wherein gas is: nitrogen or air, as long as the control material is not gone out reactor.
5. press the preparation method of the spherical polystyrol of the described low volatile of claim 1, it is characterized in that: in reaction process, reaction system is in the negative pressure system, and negative pressure helps steaming of volatile matter, as long as the control material is not towards reactor.
6. press the preparation method of the spherical polystyrol of the described low volatile of claim 1, it is characterized in that: described high boiling substance adds continuously, intermittent type adds or disposable adding, wherein, the final addition of high boiling substance is 1～12 times of feed particles weight; When the concentration of the high boiling substance aqueous solution in the reaction system＞30%, the high boiling substance aqueous solution and feed particles weight ratio want 〉=1.
7. press the preparation method of the spherical polystyrol of claim 1 or 6 described low volatiles, it is characterized in that: described polyvalent alcohol is trivalent alcohol or tetravalent alcohol.
8. press the preparation method of the spherical polystyrol of claim 1 or 6 described low volatiles, it is characterized in that: described polyvalent alcohol is glycerol and/or tetramethylolmethane.
9. press the preparation method of the spherical polystyrol of the described low volatile of claim 1, it is characterized in that: described inorganic dispersant is: magnesium basic carbonate, magnesium hydroxide, calcium phosphate powder, silicate, zinc oxide, lime carbonate, barium carbonate, caoxalate, barium sulfate, aluminium hydroxide or zinc sulphide;
Tensio-active agent is: sodium alkyl benzene sulfonate, alkylsurfuric acid acid sodium, sulfonate type anionic fluorinated surfactant, fluoroalkyl oxyethyl group ether alcohol nonionogenic tenside, polyether surfactant, polyethylene glycols nonionogenic tenside, tween series of surfactants or span series;
Macromolecular compound is: the sodium salt of the multipolymer of the sodium salt of the sodium salt of the sodium salt of maleic anhydride and styrol copolymer, maleic anhydride and ethyl acetate copolymer, methylene-succinic acid and styrol copolymer, methylene-succinic acid and ethyl acetate, the sodium salt of acrylate copolymer, the sodium salt of methacrylate polymer, Polyvinylpyrolidone (PVP), phenolic aldehyde and urea aldehyde polycondensate, polyvinyl alcohol, gelatin or ether of cellulose.
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| CN103121549A (en) * | 2013-01-28 | 2013-05-29 | 熊建珍 | Packing box made of expandable polystyrene (EPS) material and manufacture method thereof |
| WO2014117736A1 (en) * | 2013-01-29 | 2014-08-07 | Dai Jianlin | Artificial material particle |
| CN105295215A (en) * | 2014-07-16 | 2016-02-03 | 江苏业达鑫化工有限公司 | Preparation method for bead-shaped black polystyrene particles |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4303783A (en) * | 1980-05-05 | 1981-12-01 | Arco Polymers, Inc. | Production of reflector beads from precursor beads for expandable polystyrene |
| CN1111642A (en) * | 1994-01-19 | 1995-11-15 | 费纳技术股份有限公司 | Method and apparatus for reducing volatiles in polymerized styrene |
| CN1243839A (en) * | 1998-07-22 | 2000-02-09 | 弗纳技术股份有限公司 | Purification of recycled polystyrene |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4303783A (en) * | 1980-05-05 | 1981-12-01 | Arco Polymers, Inc. | Production of reflector beads from precursor beads for expandable polystyrene |
| CN1111642A (en) * | 1994-01-19 | 1995-11-15 | 费纳技术股份有限公司 | Method and apparatus for reducing volatiles in polymerized styrene |
| CN1243839A (en) * | 1998-07-22 | 2000-02-09 | 弗纳技术股份有限公司 | Purification of recycled polystyrene |
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