CN106432797A - Recycling technology of waste crosslinked polycarbonate - Google Patents
Recycling technology of waste crosslinked polycarbonate Download PDFInfo
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- CN106432797A CN106432797A CN201610642824.8A CN201610642824A CN106432797A CN 106432797 A CN106432797 A CN 106432797A CN 201610642824 A CN201610642824 A CN 201610642824A CN 106432797 A CN106432797 A CN 106432797A
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- waste
- linked polycarbonate
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B2017/001—Pretreating the materials before recovery
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B2017/001—Pretreating the materials before recovery
- B29B2017/0015—Washing, rinsing
-
- 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
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
-
- 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
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
-
- 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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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- 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 recycling technology of waste crosslinked polycarbonate. The recycling technology comprises the following steps of 1 pretreating waste crosslinked polycarbonate, wherein surface spraying cleaning and ultraviolet sterilizing are conducted on polycarbonate; 2 depolymerizing and recycling waste crosslinked polycarbonate, wherein waste crosslinked polycarbonate treated in the step 1 is crushed and then added into an extruding machine, molecular chains of crosslinked polycarbonate are depolymerized under the action of high temperature and alternating shearing, and then recycling is achieved. The recycling technology has the advantages that crosslinked polycarbonate can be efficiently depolymerized in an environment-friendly mode, depolymerized polycarbonate has the high-temperature liquidity and the processibility and can be directly applied to downstream product production, and the pollution and low efficiency problems existing in a traditional treatment method are solved.
Description
Technical field
The present invention relates to the recycling field of resource, be specifically related to the recovery work of a kind of waste and old cross-linked polycarbonate
Skill.
Background technology
The difficult recovery of cross-linked polycarbonate, crosslinks just because of its strand, defines space network.Very certainly
So, the recovery of cross-linked polycarbonate to be realized, destroys its space network, makes the cross-linked structure generation depolymerization of molecule interchain break
Key, so that it may realize the recovery of cross-linked polycarbonate.
The destruction of chemical bond has two kinds of methods, i.e. chemical method and physical method.Chemical method is to utilize chemical assistant, as
Organic disulfide, mercaptan, alkali metal etc., at high temperature, carry out attack destruction by these auxiliary agents so that crosslinked to cross-bond
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 again crosslinked,
So cross-linked polycarbonate is just depolymerized to non-crosslinked Merlon, has flowable and processability, can be as thermoplastic poly carbon
Acid esters equally recycles.Chemical method needs to add chemical assistant, and cost improves, and in depolymehzation process, can produce big
The corrosivity of amount or toxic gas, easily cause secondary pollution, and therefore chemical 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 the cubic network of cross-linked polycarbonate tie
Structure destroys, and forms the such material of two-dimensional structure of low relative molecular weight of line style straight or branched type and has temperature flowing and can
Processability and be regenerated utilization.Conventional at present is the method for microwave or ultrasonic wave, although physical method is not owing to having chemistry
The addition of material, will not cause secondary pollution, relative environmental protection, but the equipment investment of these methods is big, is difficult to realize continuous metaplasia
Producing, therefore efficiency is very low, is difficult to realize in large-scale industrial production field, mostly rests on laboratory stage.
For existing recovery cross-linked polycarbonate discarded object method problem encountered, need research efficiently dirty without secondary
The new recovery and treatment method of dye.
Content of the invention
The technical problem to be solved is to provide the recovery process of a kind of waste and old cross-linked polycarbonate.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of recovery process of waste and old cross-linked polycarbonate,
Step is as follows：
Step 1) pretreatment of waste and old cross-linked polycarbonate：Waste and old cross-linked polycarbonate is carried out surface spraying cleaning and purple
Outside line is sterilized；
Step 2) waste and old cross-linked polycarbonate depolymerization reclaim：By step 1) process after waste and old cross-linked polycarbonate through powder
After broken, add extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polycarbonate, it is achieved
Recycle.
The invention has the beneficial effects as follows：Can be with environment-friendly high-efficiency ground depolymerization cross-linked polycarbonate so that the poly-carbonic acid after depolymerization
Ester has temperature flowing and machinability, directly applies to the production of articles in downstream, solve traditional treatment method pollution 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 is 56～
80, screw speed is 400～1200rpm so that the shearing linear velocity that material bears is 4-8m/s；The screw rod group of described extruder
The alternating cycles closing holding shearing force is 2～10.
Further, described extruder is parallel dual-screw extruding machine.
Further, described waste and old cross-linked polycarbonate 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 keeps the alternating cycles of shearing force is 5～8.
Detailed description of the invention
Being described the principle and feature of the present invention below, 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 recovery process of waste and old cross-linked polycarbonate,
Step is as follows：
Step 1) pretreatment of waste and old cross-linked polycarbonate：Waste and old cross-linked polycarbonate is carried out surface spraying cleaning and purple
Outside line is sterilized；
Step 2) waste and old cross-linked polycarbonate depolymerization reclaim：By step 1) process after waste and old cross-linked polycarbonate through powder
After broken, add extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polycarbonate, it is achieved
Recycle.
The invention has the beneficial effects as follows：Can be with environment-friendly high-efficiency ground depolymerization cross-linked polycarbonate so that the poly-carbonic acid after depolymerization
Ester has temperature flowing and machinability, directly applies to the production of articles in downstream, solve traditional treatment method pollution 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 shearing linear velocity that material bears is 4m/s；The screw combinations of described extruder is protected
The alternating cycles holding shearing force is 2.
Further, described waste and old cross-linked polycarbonate 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 recovery process of waste and old cross-linked polycarbonate,
Step is as follows：
Step 1) pretreatment of waste and old cross-linked polycarbonate：Waste and old cross-linked polycarbonate is carried out surface spraying cleaning and purple
Outside line is sterilized；
Step 2) waste and old cross-linked polycarbonate depolymerization reclaim：By step 1) process after waste and old cross-linked polycarbonate through powder
After broken, add extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polycarbonate, it is achieved
Recycle.
The invention has the beneficial effects as follows：Can be with environment-friendly high-efficiency ground depolymerization cross-linked polycarbonate so that the poly-carbonic acid after depolymerization
Ester has temperature flowing and machinability, directly applies to the production of articles in downstream, solve traditional treatment method pollution 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
1200rpm so that the shearing linear velocity that material bears is 8m/s, and die pressure is 18MPa；The screw combinations of described extruder is protected
The alternating cycles holding shearing force is 10.
Further, described waste and old cross-linked polycarbonate 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 recovery process of waste and old cross-linked polycarbonate,
Step is as follows：
Step 1) pretreatment of waste and old cross-linked polycarbonate：Waste and old cross-linked polycarbonate is carried out surface spraying cleaning and purple
Outside line is sterilized；
Step 2) waste and old cross-linked polycarbonate depolymerization reclaim：By step 1) process after waste and old cross-linked polycarbonate through powder
After broken, add extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polycarbonate, it is achieved
Recycle.
The invention has the beneficial effects as follows：Can be with environment-friendly high-efficiency ground depolymerization cross-linked polycarbonate so that the poly-carbonic acid after depolymerization
Ester has temperature flowing and machinability, directly applies to the production of articles in downstream, solve traditional treatment method pollution 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, die pressure be the shearing linear velocity that 12MPa makes material bear be 6m/s；The screw combinations of described extruder keeps
The alternating cycles of shearing force is 5.
Further, described waste and old cross-linked polycarbonate 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 recovery process of waste and old cross-linked polycarbonate,
Step is as follows：
Step 1) pretreatment of waste and old cross-linked polycarbonate：Waste and old cross-linked polycarbonate is carried out surface spraying cleaning and purple
Outside line is sterilized；
Step 2) waste and old cross-linked polycarbonate depolymerization reclaim：By step 1) process after waste and old cross-linked polycarbonate through powder
After broken, add extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polycarbonate, it is achieved
Recycle.
The invention has the beneficial effects as follows：Can be with environment-friendly high-efficiency ground depolymerization cross-linked polycarbonate so that the poly-carbonic acid after depolymerization
Ester has temperature flowing and machinability, directly applies to the production of articles in downstream, solve traditional treatment method pollution 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 shearing linear velocity that material bears is 5m/s, and die pressure is 15MPa；Described extruder
It is 8 that screw combinations keeps the alternating cycles of shearing force.
Further, described waste and old cross-linked polycarbonate is crushed to the particle that particle diameter is 0.7cm.
Comparative example 1
Material, equipment and processing technology are same as in Example 1, and screw speed is set to 300rpm.Cross-linked polycarbonate is not
Can be granulated by double screw extruder, 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 etc. made, should be included within the scope of the present invention.
Claims (7)
1. the recovery process of a waste and old cross-linked polycarbonate, it is characterised in that step is as follows：
Step 1) pretreatment of waste and old cross-linked polycarbonate：Waste and old cross-linked polycarbonate is carried out surface spraying cleaning and ultraviolet
Sterilization；
Step 2) waste and old cross-linked polycarbonate depolymerization reclaim：By step 1) process after waste and old cross-linked polycarbonate size-reduced
After, add extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polycarbonate, it is achieved return
Receive and utilize.
2. the recovery process of waste and old cross-linked polycarbonate according to claim 1, 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 that material bears
Linear velocity is 4-8m/s；
It is 2～10 that the screw combinations of described extruder keeps the alternating cycles of shearing force.
3. the recovery process of waste and old cross-linked polycarbonate according to claim 1, it is characterised in that described extruder is
Parallel dual-screw extruding machine.
4. the recovery process of waste and old cross-linked polycarbonate according to claim 1, it is characterised in that described waste and old crosslinking
Merlon is crushed to the particle that particle diameter is 0.5-1cm.
5. the recovery process of the waste and old cross-linked polycarbonate according to Claims 2 or 3, it is characterised in that described extruder
Extrusion temperature be 275～285 DEG C, die pressure is 12～18MPa.
6. the recovery process of waste and old cross-linked polycarbonate according to claim 5, it is characterised in that described extruder screw
Draw ratio be 56～60, screw speed is 800～1000rpm.
7. the recovery process of waste and old cross-linked polycarbonate according to claim 6, it is characterised in that the spiral shell of described extruder
It is 5～8 that bar combination keeps the alternating cycles of shearing force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610642824.8A CN106432797A (en) | 2016-08-08 | 2016-08-08 | Recycling technology of waste crosslinked polycarbonate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610642824.8A CN106432797A (en) | 2016-08-08 | 2016-08-08 | Recycling technology of waste crosslinked polycarbonate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106432797A true CN106432797A (en) | 2017-02-22 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610642824.8A Pending CN106432797A (en) | 2016-08-08 | 2016-08-08 | Recycling technology of waste crosslinked polycarbonate |
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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 |
| CN105593199A (en) * | 2013-10-07 | 2016-05-18 | 田冈化学工业株式会社 | Needle retraction mechanism for autoinjector |
-
2016
- 2016-08-08 CN CN201610642824.8A patent/CN106432797A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105593199A (en) * | 2013-10-07 | 2016-05-18 | 田冈化学工业株式会社 | Needle retraction mechanism for autoinjector |
| CN105061805A (en) * | 2015-07-22 | 2015-11-18 | 浙江大学 | Recovery process for crosslinked polyethylene wastes |
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Application publication date: 20170222 |
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