CN106432798A - Recovery process of waste cross-linked polyethylene terephthalate - Google Patents
Recovery process of waste cross-linked polyethylene terephthalate Download PDFInfo
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- CN106432798A CN106432798A CN201610658434.XA CN201610658434A CN106432798A CN 106432798 A CN106432798 A CN 106432798A CN 201610658434 A CN201610658434 A CN 201610658434A CN 106432798 A CN106432798 A CN 106432798A
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- waste
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- crosslinking
- extruder
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention relates to a recovery process of waste cross-linked polyethylene terephthalate. The process comprises the following steps of 1 pretreatment of waste cross-linked polyethylene terephthalate, wherein surface spray cleaning and ultraviolet sterilization are conducted on waste cross-linked polyethylene terephthalate; 2 depolymerization recovery of waste cross-linked polyethylene terephthalate, wherein after waste cross-linked polyethylene terephthalate obtained after being treated in the first step is crushed, crushed waste cross-linked polyethylene terephthalate is added into an extruder, under the action of high temperature and alternating shear, a molecular chain of cross-linked polyethylene terephthalate is subjected to depolymerization, and recycling is achieved. The recovery process of waste cross-linked polyethylene terephthalate has the advantages that cross-linked polyethylene terephthalate can be depolymerized in an environmentally friendly and efficient mode, depolymerized polyethylene terephthalate is made to have high-temperature flowability and processibility and can be directly applied to downstream product production, and the problems that for a traditional treatment method, pollution exists, and the efficiency is low are solved.
Description
Technical field
The present invention relates to the recycling field of resource, it is specifically related to a kind of waste and old crosslinking PET
Recovery process.
Background technology
The difficult recovery of crosslinked PET, crosslinks just because of its strand, defines stereoscopic graticule
Shape structure.Naturally, the recovery of crosslinked PET to be realized, destroy its space network, make strand
Between cross-linked structure there is depolymerization scission of link so that it may realize the recovery of crosslinked PET.
The destruction of chemical bond has two methods, i.e. chemical method and physical method.Chemical method is to utilize chemical assistant, such as
Organic disulfide, mercaptan, alkali metal etc., at high temperature, carry out attack destruction by these auxiliary agents to cross-bond so that crosslinking
Key disconnects, and these materials can also carry out inertia end seal the active chain end disconnecting simultaneously, it is to avoid the cross-bond of destruction is crosslinked again,
So crosslinked PET is just depolymerized to non-crosslinked PET, has flowable and processing
Property, can recycle as thermoplastic poly PETP.Chemical method needs to add chemical assistant, and cost carries
Height, and in depolymehzation process, substantial amounts of corrosivity or toxic gas can be produced, easily cause secondary pollution, therefore chemistry side
Method is not a kind of effective method of environmental protection.
Physical method is to be added without chemical substance, just with external energy, makes crosslinked PET
Dimensional network structure destroys, and the such material of two-dimensional structure forming the low relative molecular weight of line style straight or branched type has high temperature
Mobility and machinability and be regenerated utilization.Commonly use at present be microwave or ultrasonic wave method although physical method by
In the addition not having chemical substance, secondary pollution, relative environmental protection will not be caused, but the equipment investment of these methods is big, be difficult to real
Existing continuous prodution, therefore efficiency is very low, is difficult to realize in large-scale industrial production field, mostly rests on laboratory rank
Section.
Reclaim crosslinked PET discarded object method problem encountered for existing, need research high
The new recovery and treatment method of effect non-secondary pollution.
Content of the invention
The technical problem to be solved is to provide a kind of recovery work of waste and old crosslinking PET
Skill.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of waste and old crosslinking PET
Recovery process, step is as follows：
Step 1) waste and old crosslinking PET pretreatment：By waste and old crosslinking PET
Carry out surface spraying cleaning and ultraviolet sterilization；
Step 2) waste and old crosslinking PET depolymerization reclaim：By step 1) process after waste and old crosslinked poly-
PETP after crushed, adds extruder, so that crosslinked poly- terephthaldehyde under high temperature and alternating shear effect
There is depolymerization in the strand of sour second diester, realize recycling.
The invention has the beneficial effects as follows：Can be with environment-friendly high-efficiency ground depolymerization crosslinking PET so that depolymerization
PET afterwards has temperature flowing and machinability, directly applies to the production of articles in downstream, solves
The pollution of traditional treatment method and low efficiency problem.
On the basis of technique scheme, the present invention can also do following improvement：
Further, the extrusion temperature of described extruder is 240～300 DEG C；The process time of described material is 30-60s；
Described extruder is single screw extrusion machine or double screw extruder；The draw ratio of described extruder screw be 56～
80, screw speed is 400～1200rpm so that the cutter shearing line speed that material bears is 4-8m/s；The screw rod group of described extruder
Close and keep the alternating cycles of shearing force to be 2～10.
Further, described extruder is parallel dual-screw extruding machine.
Further, described waste and old crosslinking PET is crushed to the particle that particle diameter is 0.5-1cm.
Further, the extrusion temperature of described extruder is 275～285 DEG C, and die pressure is 12～18MPa.
Further, the draw ratio of described extruder screw is 52～60, and screw speed is 800～1000rpm.
Further, the screw combinations of described extruder keep the alternating cycles of shearing force to be 5～8.
Specific embodiment
Hereinafter the principle and feature of the present invention is described, example is served only for explaining the present invention, is not intended to limit
Determine the scope of the present invention.
Embodiment 1
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of waste and old crosslinking PET
Recovery process, step is as follows：
Step 1) waste and old crosslinking PET pretreatment：By waste and old crosslinking PET
Carry out surface spraying cleaning and ultraviolet sterilization；
Step 2) waste and old crosslinking PET depolymerization reclaim：By step 1) process after waste and old crosslinked poly-
PETP after crushed, adds extruder, so that crosslinked poly- terephthaldehyde under high temperature and alternating shear effect
There is depolymerization in the strand of sour second diester, realize recycling.
The invention has the beneficial effects as follows：Can be with environment-friendly high-efficiency ground depolymerization crosslinking PET so that depolymerization
PET afterwards has temperature flowing and machinability, directly applies to the production of articles in downstream, solves
The pollution of traditional treatment method and low efficiency problem.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the extrusion temperature of described extruder is 240 DEG C；The process time of described material is 30s；
Described extruder is parallel dual-screw extruding machine；The draw ratio of described extruder screw is 56, and screw speed is
400rpm, die pressure is 128MPa so that the cutter shearing line speed that material bears is 4m/s；The screw combinations of described extruder are protected
The alternating cycles holding shearing force are 2.
Further, described waste and old crosslinking PET is crushed to the particle that particle diameter is 0.5cm.
Embodiment 2
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of waste and old crosslinking PET
Recovery process, step is as follows：
Step 1) waste and old crosslinking PET pretreatment：By waste and old crosslinking PET
Carry out surface spraying cleaning and ultraviolet sterilization；
Step 2) waste and old crosslinking PET depolymerization reclaim：By step 1) process after waste and old crosslinked poly-
PETP after crushed, adds extruder, so that crosslinked poly- terephthaldehyde under high temperature and alternating shear effect
There is depolymerization in the strand of sour second diester, realize recycling.
The invention has the beneficial effects as follows：Can be with environment-friendly high-efficiency ground depolymerization crosslinking PET so that depolymerization
PET afterwards has temperature flowing and machinability, directly applies to the production of articles in downstream, solves
The pollution of traditional treatment method and low efficiency problem.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the extrusion temperature of described extruder is 300 DEG C；The process time of described material is 60s；
Described extruder is single screw extrusion machine；The draw ratio of described extruder screw is 80, and screw speed is
So that the cutter shearing line speed that material bears is 8m/s, die pressure is 18MPa to 1200rpm；The screw combinations of described extruder are protected
The alternating cycles holding shearing force are 10.
Further, described waste and old crosslinking PET is crushed to the particle that particle diameter is 1cm.
Embodiment 3
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of waste and old crosslinking PET
Recovery process, step is as follows：
Step 1) waste and old crosslinking PET pretreatment：By waste and old crosslinking PET
Carry out surface spraying cleaning and ultraviolet sterilization；
Step 2) waste and old crosslinking PET depolymerization reclaim：By step 1) process after waste and old crosslinked poly-
PETP after crushed, adds extruder, so that crosslinked poly- terephthaldehyde under high temperature and alternating shear effect
There is depolymerization in the strand of sour second diester, realize recycling.
The invention has the beneficial effects as follows：Can be with environment-friendly high-efficiency ground depolymerization crosslinking PET so that depolymerization
PET afterwards has temperature flowing and machinability, directly applies to the production of articles in downstream, solves
The pollution of traditional treatment method and low efficiency problem.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the extrusion temperature of described extruder is 275 DEG C；The process time of described material is 45s；
Described extruder is double screw extruder；The draw ratio of described extruder screw is 56, and screw speed is
800rpm, it is 6m/s that die pressure makes, for 12MPa, the cutter shearing line speed that material bears；The screw combinations of described extruder keep
The alternating cycles of shearing force are 5.
Further, described waste and old crosslinking PET is crushed to the particle that particle diameter is 0.8cm.
Embodiment 4
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of waste and old crosslinking PET
Recovery process, step is as follows：
Step 1) waste and old crosslinking PET pretreatment：By waste and old crosslinking PET
Carry out surface spraying cleaning and ultraviolet sterilization；
Step 2) waste and old crosslinking PET depolymerization reclaim：By step 1) process after waste and old crosslinked poly-
PETP after crushed, adds extruder, so that crosslinked poly- terephthaldehyde under high temperature and alternating shear effect
There is depolymerization in the strand of sour second diester, realize recycling.
The invention has the beneficial effects as follows：Can be with environment-friendly high-efficiency ground depolymerization crosslinking PET so that depolymerization
PET afterwards has temperature flowing and machinability, directly applies to the production of articles in downstream, solves
The pollution of traditional treatment method and low efficiency problem.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the extrusion temperature of described extruder is 285 DEG C；The process time of described material is 50s；
Described extruder is single screw extrusion machine or double screw extruder；The draw ratio of described extruder screw is 60,
Screw speed is 1000rpm so that the cutter shearing line speed that material bears is 5m/s, and die pressure is 15MPa；Described extruder
Screw combinations keep the alternating cycles of shearing force to be 8.
Further, described waste and old crosslinking PET is crushed to the particle that particle diameter is 0.7cm.
Comparative example 1
Material, equipment and processing technology are same as Example 1, and screw speed is set to 300rpm.Crosslinked poly- terephthaldehyde
Sour second diester can not be granulated by double screw extruder, and the performance parameter of material is shown in Table 1.
The performance parameter of the material in table 1 embodiment 1-4 and comparative example 1
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of recovery process of waste and old crosslinking PET is it is characterised in that step is as follows：
Step 1) waste and old crosslinking PET pretreatment：Waste and old crosslinking PET is carried out
Surface spraying cleaning and ultraviolet sterilization；
Step 2) waste and old crosslinking PET depolymerization reclaim：By step 1) process after waste and old crosslinked poly- to benzene
Dioctyl phthalate second diester after crushed, adds extruder, so that crosslinked poly terephthalic acid second under high temperature and alternating shear effect
There is depolymerization in the strand of diester, realize recycling.
2. according to claim 1 waste and old crosslinking PET recovery process it is characterised in that
The extrusion temperature of described extruder is 240～300 DEG C；
The process time of described material is 30-60s；
Described extruder is single screw extrusion machine or double screw extruder；
The draw ratio of described extruder screw is 52～80, and screw speed is 400～1200rpm so that the shearing born of material
Linear velocity is 4-8m/s；
The screw combinations of described extruder keep the alternating cycles of shearing force to be 2～10.
3. the recovery process of waste and old crosslinking PET according to claim 1 is it is characterised in that described
Extruder be parallel dual-screw extruding machine.
4. the recovery process of waste and old crosslinking PET according to claim 1 is it is characterised in that described
Waste and old crosslinking PET be crushed to particle diameter be 0.5-1cm particle.
5. according to Claims 2 or 3 waste and old crosslinking PET recovery process it is characterised in that
The extrusion temperature of described extruder is 275～285 DEG C, and die pressure is 12～18MPa.
6. the recovery process of waste and old crosslinking PET according to claim 5 is it is characterised in that described
The draw ratio of extruder screw is 56～60, and screw speed is 800～1000rpm.
7. the recovery process of waste and old crosslinking PET according to claim 6 is it is characterised in that described
The screw combinations of extruder keep the alternating cycles of shearing force to be 5～8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610658434.XA CN106432798A (en) | 2016-08-11 | 2016-08-11 | Recovery process of waste cross-linked polyethylene terephthalate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610658434.XA CN106432798A (en) | 2016-08-11 | 2016-08-11 | Recovery process of waste cross-linked polyethylene terephthalate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106432798A true CN106432798A (en) | 2017-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610658434.XA Pending CN106432798A (en) | 2016-08-11 | 2016-08-11 | Recovery process of waste cross-linked polyethylene terephthalate |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104999593A (en) * | 2015-07-31 | 2015-10-28 | 兴安宸亿工贸有限公司 | Waste polyethylene terephthalate recycling and reusing method |
| CN105061805A (en) * | 2015-07-22 | 2015-11-18 | 浙江大学 | Recovery process for crosslinked polyethylene wastes |
-
2016
- 2016-08-11 CN CN201610658434.XA patent/CN106432798A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105061805A (en) * | 2015-07-22 | 2015-11-18 | 浙江大学 | Recovery process for crosslinked polyethylene wastes |
| CN104999593A (en) * | 2015-07-31 | 2015-10-28 | 兴安宸亿工贸有限公司 | Waste polyethylene terephthalate recycling and reusing method |
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Application publication date: 20170222 |
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