CN1045782C - Low-temp recovery technique for waste plastics of polyvinyl-chloride and polythene - Google Patents
Low-temp recovery technique for waste plastics of polyvinyl-chloride and polythene Download PDFInfo
- Publication number
- CN1045782C CN1045782C CN96115778A CN96115778A CN1045782C CN 1045782 C CN1045782 C CN 1045782C CN 96115778 A CN96115778 A CN 96115778A CN 96115778 A CN96115778 A CN 96115778A CN 1045782 C CN1045782 C CN 1045782C
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- China
- Prior art keywords
- polyvinyl chloride
- vinyon
- waste
- plastic
- solvent
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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
Abstract
The present invention relates to a method for regenerating waste plastic, which comprises the steps that waste polyvinyl chloride and polyethylene plastic are cleaned, dried and pulverized; a solvent, a catalyst and polyoxyethylene mannitol fatty acid ester are added to the pulverized powder at room temperature or below 100 DEG C, and are sufficiently stirred to dissolve the waste plastic, the obtained solution is quenched at about 0 DEG C, and the dissolved plastic is precipitated in powder; then, the powder is filtered, cleaned and dried to obtain the regenerated polyvinyl chloride and polyethylene plastic powder; after being processed, the filter liquor can be recycled. The present invention has the advantages of simple technology, low energy consumption and no plastic performance injury, and the quality of the regenerated plastic raw material can approach to the quality of a new plastic raw material.
Description
The present invention relates to a kind of waste plastics recycling method.
Existing plastic waste reutilization technology generally is with the plastic waste high-temperature fusion, is reprocessed into various plastics after making it enter viscous state.This technology is because the high temperature and the inequality of being heated make the macromolecular chain depolymerization, even charing, big havoc the mechanical property of superpolymer.In addition because charing, even if the goods of producing with white or colourless plastic waste also all are black or brown, the transparency extreme difference; Several plastic waste dissolving regeneration techniqueses that proposed in recent years, because conglomerate when superpolymer is separated out in solution, the centre is being carried a large amount of solvents secretly, have plenty of and adopt vacuum distillation method to evaporate whole solvents after superpolymer dissolves, what have then is that " filter cake " pulverizing back is evaporated to remove solvent residual in the reprocessed plastic(s) by high-temperature vacuum; What have then is that the gel sosoloid of reprocessed plastic(s) and solvent is pulverized laggard capable steam distillation, to remove the residual solvent in the reprocessed plastic(s), as application number is 90109251.7.91102608.893102183.9, resemble these " underpressure distillation ", " high-temperature vacuum distillation ", " steam distillation " in large-scale industrial production, except that increasing energy consumption, implement and all compare difficulty.
The objective of the invention is for remedying the deficiencies in the prior art, provide that a kind of technology is simple, consuming little energy and do not damage plastics performance, make the reclaiming product technology of regenerated plastic raw materials quality near newborn plastic raw materials.
The objective of the invention is to realize with following technical scheme:
With waste polyvinyl chloride, vinyon after cleaning, dry, pulverizing, in room temperature or be lower than and add solvent, catalyzer and polyoxyethylene N.F,USP MANNITOL fatty acid ester under 100 ℃ of temperature, fully stir, make the plastic waste dissolving, about 0 ℃, make the quenching of gained solution, the dissolved plastics are separated out with powder type, filter, cleaning-drying the polyvinyl chloride of must regenerating, vinyon powder then.Filtrate can be recycled after treatment.
The present invention's several steps in the following order carries out:
1. will give up earlier mulch film, useless food bags etc. are slightly washed with tap water, and flush away is attached to the silt on the waste plastic film.
2. be cut into less than 1cm after the waste plastic film that will slightly wash dries
2Fragment.(need not finish-drying, the electrostatic effect when having a moisture can alleviate pulverizing)
3. waste plastic film after will pulverizing is washed one time with 5% sodium hydroxide solution bubble of heat earlier, washes twice with tap water again.Wash and place indoor seasoning.
4. add solvent in the reactor that reflux condensation mode equipment is housed earlier, the proportioning of solvent and plastic waste is 6-10 by weight: 1.According to dissolved plastic waste kind, one or more in solvent optional decolour certainly gasoline, toluene, dimethylbenzene, hexanaphthene, pimelinketone, tetrahydrofuran (THF), dioxan, ethyl acetate, the ethyl acetate.
5. in solvent, add catalyzer Sulfonates or peroxide compound, its add-on is the 0.1-1.5% of waste plastic film quality, add polyoxyethylene N.F,USP MANNITOL fatty acid ester, its add-on is the 0.1-1.5% of waste plastic film quality, fully stir, make the catalyzer of adding and polyoxyethylene N.F,USP MANNITOL fatty acid ester and solvent fully miscible.
6. add the waste plastic film of pulverizing after drying.The proportioning of waste plastic film and solvent is 6-10 by weight: 1.
7. under agitation, make the interior mixture of still be warmed up to 25 ℃-90 ℃ (because of plastic waste kind difference differences), keep proper temperature, plastic waste is all dissolved.
8. solution is put into cooling tank, 0 ℃ of left and right sides quenching, the dissolved plastic waste is separated out with Powdered.
9. wait to separate out to finish, put into suction filtration machine suction filtration, mother liquor is pumped as far as possible.
10. the filtrate that Chou Chus adds the Calcium Chloride Powder Anhydrous drying, and it is reusable to remove calcium chloride after filtering.
11. the plastic powders that leaches washes with tap water, washes the lip-deep polyoxyethylene N.F,USP MANNITOL of plastic grain fatty acid ester off and is adsorbed on solvent on the particle surface, (all bath wateies are reusable after filtering) drains wherein moisture with the suction filtration machine then.
12. the plastic powders after draining is dry under 30 ℃-50 ℃ temperature, the plastic powders package storage behind the finish-drying.
The present invention adds catalyzer in polyvinyl chloride, polyethylene solution, played and reduced the effect of solvent temperature, and made the plastics after the dissolving form particulate state; In solution, add polyoxyethylene N.F,USP MANNITOL fatty acid ester, surface attachment one deck polyoxyethylene N.F,USP MANNITOL fatty acid ester when solution is separated out, can stop the adhesion cohesion of plastic grain, be easy to suction filtration, avoided carrying solvent secretly in the reprocessed plastic(s) agglomeration process, this attached to the lip-deep polyoxyethylene N.F,USP MANNITOL of plastic grain fatty acid ester, can in water washing process, wash off, simultaneously because the emulsifying effect of polyoxyethylene N.F,USP MANNITOL fatty acid ester, also can make and be adsorbed on the lip-deep solvent of plastic grain on a small quantity and water-washed away, so only just can obtain purer reprocessed plastic(s) by suction filtration and washing, and the regeneration polyvinyl chloride that obtains of suction filtration, polyethylene, basically be Powdered, need not to pulverize, thereby simplified production technique greatly.
The invention will be further described below in conjunction with embodiment:
Embodiment 1: take by weighing waste polyethylene food bag 50Kg, slightly wash with tap water earlier, flush away is attached to the silt on the waste plastic film.Dry after washing and be cut into less than 1cm
2Fragment.Do not need finish-drying before cutting, anhydrous drip goes out to be advisable when cutting, and too dry can produce electrostatic adhesion when cutting.
Cut the back fragment and washed 20 minutes with 5% sodium hydroxide solution bubble of heat earlier, wash twice with tap water again, the greasy dirt on the flush away plastic flakes washes and places seasoning in the ventilating chamber.(moisture content gets final product less than 3% of gross weight) adds 1: 1 the decolouring gasoline and the mixed solvent 400Kg of toluene earlier in the reactor that has reflux condensation mode equipment, start stirring, add alkyl sodium sulfonate 0.5Kg again, polyoxyethylene N.F,USP MANNITOL fatty acid ester 1Kg is dissolved in the mixed solvent it fully.Add dry good food bag fragment, warming while stirring to 60 ℃-70 ℃ kept temperature in the kettle about one hour, allowed the food bag fragment all dissolve.Solution is put into cooling tank, is cooled fast to about 0 ℃ with ammonium nitrate solution or mixture of ice and water, and polyethylene is separated out with superfine particle.Separate out and finish, put into suction filtration machine suction filtration, the solvent in the product is pumped as far as possible.Filtrate is used the Calcium Chloride Powder Anhydrous drying, and it is reusable to remove calcium chloride after filtration.The polyethylene powders that suction filtration obtains washes with tap water, flush away is attached to the polyoxyethylene N.F,USP MANNITOL fatty acid ester on polyethylene particle surface, but simultaneously by means of the emulsifying effect of polyoxyethylene N.F,USP MANNITOL fatty acid ester also flush away attached to the trace solvent on polyethylene particle surface.Wash the back product and place 30 ℃-50 ℃ kiln inner drying, obtain the about 45-47kg of white polyethylene behind the finish-drying, be Powdered basically.
Embodiment 2: get waste polyvinyl chloride mulch film 100kg, rinse out silt with tap water earlier, be cut into less than 1cm after drying
2Fragment.Washed 20 minutes with 50 ℃ sodium hydroxide solution bubble again, after suction filtration falls sodium hydroxide solution, with twice (all bath wateies are reusable after filtering) of tap water flushing, 50 ℃ of oven dry down.In the reactor that has reflux condensation mode equipment, add 1: 1 the decolouring gasoline and mixed solvent 750 liters of pimelinketone earlier, wherein add benzoyl peroxide 0.25Kg, start stirring, make the two and solvent fully miscible.The polyvinyl chloride fragment 50Kg that handles well more than the adding, warming while stirring to 90 ℃, constant temperature dissolving 1.5-2.0 hour.After useless mulch film dissolving fully, put into the cooling tank cryogenic quenching about 0 ℃, polyvinyl chloride is separated out with particulate state.Put into suction filtration machine suction filtration Deng polyvinyl chloride after separating out fully, it is clean with the solvent suction filtration to try one's best.(it is reusable that the filtrate drying is handled the back) suction filtration finishes the back with tap water flushing twice, washes off attached to the polyoxyethylene N.F,USP MANNITOL fatty acid ester on polyvinyl chloride particles surface and the solvent of trace.With the polyvinyl chloride particles after the washing earlier with draining in the suction filtration machine, in kiln about 60 ℃ times dry 3-4 hour again, package storage.
Claims (5)
1. waste polyvinyl chloride, the low-temp recovery technique of vinyon, comprise the steps: waste polyvinyl chloride, vinyon cleans, dry, pulverize, adding solvent then stirs, dissolving, polyvinyl chloride, polyethylene filters after separating out, washing, filtrate is reusable, it is characterized in that, in solvent, add Sulfonates or peroxide compound as catalyzer, stir with polyoxyethylene N.F,USP MANNITOL fatty acid ester, make the interior mixture of still be warmed up to 25 ℃-90 ℃, make waste polyvinyl chloride, polyethylene dissolves fully, and gained solution is at 0 ℃ of following cryogenic quenching, with Powdered polyvinyl chloride of separating out, polyethylene washing back is dry down at 30 ℃-50 ℃.
2. the low-temp recovery technique of a kind of waste polyvinyl chloride according to claim 1, vinyon, it is characterized in that, solvent is selected from one or more of decolouring gasoline, toluene, dimethylbenzene, hexanaphthene, pimelinketone, tetrahydrofuran (THF), dioxan, ethyl acetate, ethyl acetate, and the proportioning of solvent and polyvinyl chloride, vinyon is 6-10 by weight: 1.
3. the low-temp recovery technique of a kind of waste polyvinyl chloride according to claim 1, vinyon is characterized in that, the proportioning of described Sulfonates catalyzer and waste polyvinyl chloride, vinyon is 0.1-1.5% by weight.
4. the low-temp recovery technique of a kind of waste polyvinyl chloride according to claim 1, vinyon is characterized in that, the proportioning of described peroxide compound catalyst itself and waste polyvinyl chloride, vinyon is 0.1-1.5% by weight.
5. the low-temp recovery technique of a kind of waste polyvinyl chloride according to claim 1, vinyon, it is characterized in that, the polyoxyethylene N.F,USP MANNITOL fatty acid ester that adds in the solvent, its consumption are the 0.1-1.5% of waste polyvinyl chloride, vinyon by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96115778A CN1045782C (en) | 1996-05-15 | 1996-05-15 | Low-temp recovery technique for waste plastics of polyvinyl-chloride and polythene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96115778A CN1045782C (en) | 1996-05-15 | 1996-05-15 | Low-temp recovery technique for waste plastics of polyvinyl-chloride and polythene |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1137047A CN1137047A (en) | 1996-12-04 |
| CN1045782C true CN1045782C (en) | 1999-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96115778A Expired - Fee Related CN1045782C (en) | 1996-05-15 | 1996-05-15 | Low-temp recovery technique for waste plastics of polyvinyl-chloride and polythene |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100917856B1 (en) * | 2008-12-18 | 2009-09-17 | 김경수 | Reproducing method of wast e.p.s |
| CN102380918B (en) * | 2010-09-03 | 2014-03-12 | 中化蓝天集团有限公司 | Technology for recovering leftover materials of polyvinyl fluoride (PVF) films |
| CN103524780B (en) * | 2013-08-26 | 2016-01-20 | 深圳百亿莱实业有限公司 | Poly extracting method in polyethylene white garbage |
| CN103509356B (en) * | 2013-09-18 | 2016-09-28 | 深圳百亿莱实业有限公司 | Asphalt is material modified and preparation method thereof |
| CN103509357B (en) * | 2013-09-18 | 2016-09-28 | 深圳百亿莱实业有限公司 | Environment-friendlyasphalt asphalt mixture modifier and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065871A (en) * | 1991-04-18 | 1992-11-04 | 太原机械学院 | The method of regenerating waste polyethylene film to obtain polyethylene powder |
| CN1084527A (en) * | 1992-09-24 | 1994-03-30 | 阿部政和 | The renovation process of waste polyvinyl chloride and regenerating unit thereof |
-
1996
- 1996-05-15 CN CN96115778A patent/CN1045782C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065871A (en) * | 1991-04-18 | 1992-11-04 | 太原机械学院 | The method of regenerating waste polyethylene film to obtain polyethylene powder |
| CN1084527A (en) * | 1992-09-24 | 1994-03-30 | 阿部政和 | The renovation process of waste polyvinyl chloride and regenerating unit thereof |
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| Publication number | Publication date |
|---|---|
| CN1137047A (en) | 1996-12-04 |
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