CN101153090A - Method for recycling waste verelite sponge plastics - Google Patents
Method for recycling waste verelite sponge plastics Download PDFInfo
- Publication number
- CN101153090A CN101153090A CNA2006100628622A CN200610062862A CN101153090A CN 101153090 A CN101153090 A CN 101153090A CN A2006100628622 A CNA2006100628622 A CN A2006100628622A CN 200610062862 A CN200610062862 A CN 200610062862A CN 101153090 A CN101153090 A CN 101153090A
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- CN
- China
- Prior art keywords
- polystyrene foam
- waste polystyrene
- foam plastic
- water
- lysate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The present invention discloses a method of using solvent to recycle waste polystyrene foam. A method of recycling waste polystyrene foam comprises that: the impurities in the waste polystyrene foam is eliminated; the waste polystyrene foam is crushed and screened through a screen net of a hole-diameter of 50mm to 80mm; the waste polystyrene foam screened in the step (1) is added into nylon acidic dimethyl. The dissolution solution can be prepared after the stirring the polystyrene foam at the room temperature and under the normal pressure to completely dissolve the polystyrene foam. Then water of 70 percent to 150 percent of the total weight is added into the dissolution solution for delamination; the nylon acidic dimethyl and polystyrene resin are separated. The separated polystyrene resin is then dried, crushed, and granulated. The present invention has the simple method, the secure and environmentally protective process, and is suitable for industrialized large-scale application.
Description
Technical field
The present invention relates to reclaim the method for waste polystyrene foam plastic, relate in particular to a kind of method with the solvent recuperation waste polystyrene foam plastic.
Background technology
Polystyrene foamed plastics (Expanded Polystyrene, be called for short EPS) because characteristics such as its light weight, firm, shock-absorbing, the low moisture absorption, easy-formation and excellent water tolerance, heat insulating ability, price be low, be widely used in fields such as packing, insulation, waterproof, heat insulation, damping, be one of most widely used plastics in the world today, can be applicable to the Shockproof packaging of electrical equipment, instrument, artwork and other rapid wear valuables and the aspects such as packing of snack food product.The major part that present China uses is the polystyrene foamed plastics snack container, and it is along the line that a large amount of depleted porous plastics snack containers are scattered in traffic, rivers and lakes, and tourist attractions, ground such as streets and lanes have formed well-known " white pollution ".Because polystyrene has characteristics such as anti-aging, protection against corrosion, thus not perishable at occurring in nature, also be difficult for being degraded by microorganisms, even if buried, also can the polluted underground water source, destroy Soil structure, make the food crop underproduction.As simple burning disposal, then again can severe contamination air and atmospheric environment.To reuse of Waste Polystyrene Foams, both can reduce environmental pollution, can turn waste into wealth again, therefore save energy becomes the countries in the world question of common concern.The recycling of waste and old polystyrol has three kinds of methods substantially: the direct recycling of (1) polystyrene foamed plastics, as: melt pelletization method and composite modified resin method.(2) pyrolysis or catalyse pyrolysis preparation of styrene, aromatic hydrocarbons and oil fuel.(3) solvent method reclaims purification polystyrene (PS) preparation tackiness agent, coating etc.
Solvent method reclaims the used solvent of polystyrene foamed plastics (EPS) by being generally acetone, vinyl acetic monomer, dimethylbenzene, chlorobenzene, halohydrocarbon etc. at present, utilize these solvent recuperation EPS mainly to have two large problems: one, because of selecting for use solvent boiling point low, volatile, therefore inflammable and explosive, there is potential safety hazard; Its two, the solvent for use general toxicity is bigger, healthy influential to the people.
Publication number is that the application for a patent for invention of CN1749297A discloses a kind of method that deposed polystyrene digs the foam plastics that reclaims, and adopts mandarin oil to dig the foam plastics as the dissolution with solvents deposed polystyrene, makes precipitate of polystyrene with alcohols or ether solvent again.Its complicated operating process, the same problem of using low boiling point solvent to handle that exists.
Summary of the invention
An object of the present invention is to overcome the deficiencies in the prior art, a kind of method of recovery waste polystyrene foam plastic of simple to operate, process clean environment firendly is provided.
Another object of the present invention provides a kind of method that waste polystyrene foam plastic obtains the good polystyrene of form and aspect that reclaims.
The technical scheme that realizes above purpose is:
A kind of method that reclaims waste polystyrene foam plastic is characterized in that comprising:
(1) remove foreign material in the waste polystyrene foam plastic after, be that the screen cloth of 50～80mm screens by bore dia after crushed;
(2) with the waste polystyrene foam plastic of (1) step screening, put in the nylon acid dimethyl ester, stirring is at normal temperatures and pressures fully dissolved it, obtains lysate;
(3) water that adds its total mass 70～150% then in lysate makes its layering, and nylon acid dimethyl ester is separated with polystyrene resin;
(4) polystyrene resin of separating is carried out drying, pulverize granulation.
A kind of method that reclaims waste polystyrene foam plastic also further comprises: add the discoloring agent of its total mass 0.8～10% in lysate, stir, seal 10～24 hours again.
The present invention has the beneficial effect of following several respects:
1) equipment of Shi Yonging is simple, and selected solvent can be recycled, because cost is low, is easy to realize suitability for industrialized production.
2) the solvent NME of Shi Yonging is the environment-friendly type solvent, is environmentally friendly technology in whole process of production therefore.
3) solved inflammable and explosive unsafe hidden danger when reclaiming polystyrene foamed plastics with solvent method in the past.
4) NME recycles, and can realize inner partial circulating.
5) polystyrene foamed plastics of returning can utilize again again, realizes the systemic circulation of society.
Embodiment
The nylon acid dimethyl ester of using among the present invention (NME) is a kind of colourless transparent liquid, and the boiling range higher range is between 196～225 ℃, and the NME low toxicity is slightly savory, and ((teige close-loop) 100 ℃ is so NME is non-inflammable explosive article to flash-point.NME and most of organic monomer and polymkeric substance mix fine, and special p-poly-phenyl vinylic foam has extremely strong solvability, at normal temperatures and pressures through stirring very fast dissolving.Nylon acid dimethyl ester (NME) is the mixture of dimethyl succinate, Methyl glutarate and dimethyl adipate, commercial NME contains Methyl glutarate 50-68% (W%, down together), dimethyl adipate 10-25% and dimethyl succinate 10-20% usually.It is 67% that the NME biodegradability is embodied in 7 days biological degradability of dimethyl succinate, and 7 days biological degradability of Methyl glutarate is 70%, and 7 days biological degradability of dimethyl adipate is 58%.NME is stable under normal state, and long storage is convenient.Nylon acid dimethyl ester (NME) is slightly soluble in water, and aqueous NME p-poly-phenyl ethenoid resin solubleness descends, and therefore is easy under the situation of water NME is separated with polystyrene resin adding.Because NME has above rerum natura, to reclaim EPS be fully feasible so NME replaces conventional solvent acetone, vinyl acetic monomer, dimethylbenzene, chlorobenzene, halohydrocarbon to wait.Commercial NME contains Methyl glutarate 50-68% (W%, down together), dimethyl adipate 10-25% and dimethyl succinate 10-20% usually.
The purpose of employed discoloring agent is the color of deviating from polystyrene plastic among the present invention, and discoloring agent is selected silica gel, diatomite, gac or its mixture.Here first-selected silica gel, its consumption accounts for 0.8～10% of total inventory, and optimum amount is 5～9%.The time of decolouring just can reach decolorizing effect preferably at 10～24 hours, and discoloring agent can be separated by filtering mode simultaneously.
The water that uses among the present invention is as separating agent.Thereby the purpose that adds entry is to reduce the purpose that the solubleness of resin in NME reaches separation resin and NME.The consumption of water accounts for 70～150% of total inventory, and optimum quantum of utilization is 90～130%.Because the proportion of NME is bigger than water, thus resin of separating out and water on the upper strata, NME is in lower floor.With the upper strata recyclable polystyrene plastic in back that dewaters, it is reusable edible that the aqueous NME of lower floor handles through vacuum hydro-extraction at 160-180 ℃.
Below specifically describe the present invention with embodiment.
Embodiment 1
Remove impurity heavier among the waste and old EPS such as metal, stone, grit etc. with the method for wind, after simple the pulverizing, be that the screen cloth of 80mm screens by bore dia, obtain clean EPS 350 grams, EPS is dissolved in the reactor that 900 gram NME (being produced by our company) are housed, stir at normal temperatures and pressures and dissolve, add silica gel 100 grams after dissolving is finished, restir is even, places then 12 hours.After decolouring finishes material is filtered, obtain filtrate 1235 grams.Layering takes place after adding water in the water that add 1400 grams in filtrate, and lower floor is NME, and the upper strata is water and styrene resin.Earlier NME is separated, styrene resin separates water by filtering equipment with water with styrene resin, and filter cake is pulverized after drying, granulation, obtains canescence polystyrene resin 325 grams.Moisture in the middle of the nylon acid dimethyl ester can remove moisture by vacuumizing the distillatory mode, anhydrous nylon acid dimethyl ester 890 grams of recovery, utilization more capable of circulation.
Embodiment 2
Remove impurity heavier among the waste and old EPS such as metal, stone, grit etc. with the method for wind, after simple the pulverizing, be that the screen cloth of 80mm screens by bore dia, obtain clean EPS 300 grams, EPS is dissolved in the reactor that 900 gram NME (being produced by our company) are housed, stir at normal temperatures and pressures and dissolve, add diatomite 120 grams after dissolving is finished, restir is even, places then 18 hours.After decolouring finishes material is filtered, obtain filtrate 1185 grams.Layering takes place after adding water in the water that add 1000 grams in filtrate, and lower floor is NME, and the upper strata is water and styrene resin.Earlier NME is separated, styrene resin separates water by filtering equipment with water with styrene resin, and filter cake is pulverized after drying, granulation, obtains linen polystyrene resin 295 grams.Moisture in the middle of the nylon acid dimethyl ester can remove moisture by vacuumizing the distillatory mode, anhydrous nylon acid dimethyl ester 887 grams of recovery, utilization more capable of circulation.
Embodiment 3
Remove impurity heavier among the waste and old EPS such as metal, stone, grit etc. with the method for wind, after simple the pulverizing, be that the screen cloth of 80mm screens by bore dia, obtain clean EPS300 gram, EPS is dissolved in the reactor that 900 gram NME (being produced by our company) are housed, stir at normal temperatures and pressures and dissolve, add gac 50 grams after dissolving is finished, restir is even, places then 24 hours.After decolouring finishes material is filtered, obtain filtrate 1185 grams.Layering takes place after adding water in the water that add 800 grams in filtrate, and lower floor is NME, and the upper strata is water and styrene resin.Earlier NME is separated, styrene resin separates water by filtering equipment with water with styrene resin, and filter cake is pulverized after drying, granulation, obtains linen polystyrene resin 296 grams.Moisture in the middle of the nylon acid dimethyl ester can remove moisture by vacuumizing the distillatory mode, anhydrous nylon acid dimethyl ester 891 grams of recovery, utilization more capable of circulation.
More than with embodiment the present invention is described in detail, but fact Example does not constitute any limitation of the invention.It will be clear to one skilled in the art that not breaking away from any modification or the change of claim of the present invention, all belong to protection scope of the present invention.
Claims (9)
1. method that reclaims waste polystyrene foam plastic is characterized in that comprising:
(1) remove foreign material in the waste polystyrene foam plastic after, be that the screen cloth of 50～80mm screens by bore dia after crushed;
(2) with the waste polystyrene foam plastic of (1) step screening, put in the nylon acid dimethyl ester, stirring is at normal temperatures and pressures fully dissolved it, obtains lysate;
(3) water that adds its total mass 70～150% then in lysate makes its layering, and nylon acid dimethyl ester is separated with polystyrene resin;
(4) polystyrene resin of separating is carried out drying, pulverize granulation.
2. the method for recovery waste polystyrene foam plastic according to claim 1 is characterized in that also further comprising: add the discoloring agent of its total mass 0.8～10% in lysate, stir, seal 10～24 hours again.
3. the method for recovery waste polystyrene foam plastic according to claim 2 is characterized in that: the discoloring agent that adds its total mass 5～9% in lysate.
4. according to the method for claim 2 or 3 described recovery waste polystyrene foam plastics, it is characterized in that: described discoloring agent is selected from silica gel, diatomite, gac or its mixture.
5. the method for recovery waste polystyrene foam plastic according to claim 4 is characterized in that: described discoloring agent is a silica gel.
6. the method for recovery waste polystyrene foam plastic according to claim 1 is characterized in that: the water that adds its total mass 90～130% in lysate makes its layering.
7. the method for recovery waste polystyrene foam plastic according to claim 2 is characterized in that: the water that adds its total mass 90～130% in lysate makes its layering.
8. the method for recovery waste polystyrene foam plastic according to claim 3 is characterized in that: the water that adds its total mass 90～130% in lysate makes its layering.
9. the method for recovery waste polystyrene foam plastic according to claim 4 is characterized in that: the water that adds its total mass 90～130% in lysate makes its layering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100628622A CN101153090A (en) | 2006-09-27 | 2006-09-27 | Method for recycling waste verelite sponge plastics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100628622A CN101153090A (en) | 2006-09-27 | 2006-09-27 | Method for recycling waste verelite sponge plastics |
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| Publication Number | Publication Date |
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| CN101153090A true CN101153090A (en) | 2008-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2006100628622A Pending CN101153090A (en) | 2006-09-27 | 2006-09-27 | Method for recycling waste verelite sponge plastics |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104818548A (en) * | 2015-04-24 | 2015-08-05 | 长乐力恒锦纶科技有限公司 | Recovery process of polyamide 6 spinning waste yarns |
| US10385163B2 (en) | 2016-02-18 | 2019-08-20 | Lg Chem, Ltd. | Polycarbonate resin composition and optical molded article using the same |
-
2006
- 2006-09-27 CN CNA2006100628622A patent/CN101153090A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104818548A (en) * | 2015-04-24 | 2015-08-05 | 长乐力恒锦纶科技有限公司 | Recovery process of polyamide 6 spinning waste yarns |
| US10385163B2 (en) | 2016-02-18 | 2019-08-20 | Lg Chem, Ltd. | Polycarbonate resin composition and optical molded article using the same |
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Open date: 20080402 |