CN106426636A - Recovery process of waste cross-linked polyurethane - Google Patents
Recovery process of waste cross-linked polyurethane Download PDFInfo
- Publication number
- CN106426636A CN106426636A CN201610655926.3A CN201610655926A CN106426636A CN 106426636 A CN106426636 A CN 106426636A CN 201610655926 A CN201610655926 A CN 201610655926A CN 106426636 A CN106426636 A CN 106426636A
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- China
- Prior art keywords
- linked polyurethane
- waste
- cross
- recovery process
- extruder
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Classifications
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- 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
- B29B17/0412—Disintegrating plastics, e.g. by milling to large particles, e.g. beads, granules, flakes, slices
-
- 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
- C08J11/12—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 by dry-heat treatment only
-
- 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
-
- 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)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal Sciences (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention relates to a recovery process of waste cross-linked polyurethane. The recovery process comprises the following steps: step (1) pretreating waste cross-linked polyurethane: spray washing and ultraviolet sterilizing the surface of the waste cross-linked polyurethane; and step (2) depolymerizing recovering the waste cross-linked polyurethane: crushing the waste cross-linked polyurethane treated in the step (1), then adding the crushed cross-linked polyurethane into an extruder, enabling molecular chains of the cross-linked polyurethane to be depolymerized under the high-temperature and alternating shearing effect, so that the waste cross-linked polyurethane is recycled. The recovery process of the waste cross-linked polyurethane has the beneficial effects that: the cross-linked polyurethane can be efficiently depolymerized in an environmental-friendly manner, so that the depolymerized polyurethane has high-temperature mobility and machinability, can be directly applied to the production of downstream products, and solves the problems of the traditional treatment method such as pollution and low efficiency.
Description
Technical field
The present invention relates to the recycling field of resource, be specifically related to the recovery process of a kind of waste and old cross-linked polyurethane.
Background technology
The difficult recovery of cross-linked polyurethane, crosslinks just because of its strand, defines space network.Very certainly
So, the recovery of cross-linked polyurethane 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 polyurethane.
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 polyurethane is just depolymerized to non-crosslinked polyurethane, has flowable and processability, can be as thermoplastic polyurethane one
Sample recycles.Chemical method needs to add chemical assistant, and cost improves, and in depolymehzation process, can produce substantial amounts of corruption
Erosion property 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 dimensional network structure of cross-linked polyurethane
Destroying, the such material of two-dimensional structure of the low relative molecular weight forming line style straight or branched type has temperature flowing and Ke Jia
Work and be regenerated utilization.Conventional at present is the method for microwave or ultrasonic wave, although physical method is not owing to having chemicals
The addition of matter, will not cause secondary pollution, relative environmental protection, but the equipment investment of these methods is big, is difficult to realize continuous prodution,
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 polyurethane discarded object method problem encountered, need to study efficient non-secondary pollution
New recovery and treatment method.
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 polyurethane.
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 polyurethane, step
Rapid as follows:
Step 1) pretreatment of waste and old cross-linked polyurethane:Waste and old cross-linked polyurethane is carried out surface spraying cleaning and ultraviolet
Sterilization;
Step 2) waste and old cross-linked polyurethane depolymerization reclaim:By step 1) process after waste and old cross-linked polyurethane size-reduced
After, add extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polyurethane, it is achieved reclaim
Utilize.
The invention has the beneficial effects as follows:Can be with environment-friendly high-efficiency ground depolymerization cross-linked polyurethane so that the polyurethane tool after depolymerization
Have temperature flowing and machinability, directly apply to the production of articles in downstream, solve pollution and the poor efficiency of traditional treatment method
Rate 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 polyurethane 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 polyurethane, step
Rapid as follows:
Step 1) pretreatment of waste and old cross-linked polyurethane:Waste and old cross-linked polyurethane is carried out surface spraying cleaning and ultraviolet
Sterilization;
Step 2) waste and old cross-linked polyurethane depolymerization reclaim:By step 1) process after waste and old cross-linked polyurethane size-reduced
After, add extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polyurethane, it is achieved reclaim
Utilize.
The invention has the beneficial effects as follows:Can be with environment-friendly high-efficiency ground depolymerization cross-linked polyurethane so that the polyurethane tool after depolymerization
Have temperature flowing and machinability, directly apply to the production of articles in downstream, solve pollution and the poor efficiency of traditional treatment method
Rate 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 polyurethane 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 polyurethane, step
Rapid as follows:
Step 1) pretreatment of waste and old cross-linked polyurethane:Waste and old cross-linked polyurethane is carried out surface spraying cleaning and ultraviolet
Sterilization;
Step 2) waste and old cross-linked polyurethane depolymerization reclaim:By step 1) process after waste and old cross-linked polyurethane size-reduced
After, add extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polyurethane, it is achieved reclaim
Utilize.
The invention has the beneficial effects as follows:Can be with environment-friendly high-efficiency ground depolymerization cross-linked polyurethane so that the polyurethane tool after depolymerization
Have temperature flowing and machinability, directly apply to the production of articles in downstream, solve pollution and the poor efficiency of traditional treatment method
Rate 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 polyurethane 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 polyurethane, step
Rapid as follows:
Step 1) pretreatment of waste and old cross-linked polyurethane:Waste and old cross-linked polyurethane is carried out surface spraying cleaning and ultraviolet
Sterilization;
Step 2) waste and old cross-linked polyurethane depolymerization reclaim:By step 1) process after waste and old cross-linked polyurethane size-reduced
After, add extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polyurethane, it is achieved reclaim
Utilize.
The invention has the beneficial effects as follows:Can be with environment-friendly high-efficiency ground depolymerization cross-linked polyurethane so that the polyurethane tool after depolymerization
Have temperature flowing and machinability, directly apply to the production of articles in downstream, solve pollution and the poor efficiency of traditional treatment method
Rate 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 polyurethane 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 polyurethane, step
Rapid as follows:
Step 1) pretreatment of waste and old cross-linked polyurethane:Waste and old cross-linked polyurethane is carried out surface spraying cleaning and ultraviolet
Sterilization;
Step 2) waste and old cross-linked polyurethane depolymerization reclaim:By step 1) process after waste and old cross-linked polyurethane size-reduced
After, add extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polyurethane, it is achieved reclaim
Utilize.
The invention has the beneficial effects as follows:Can be with environment-friendly high-efficiency ground depolymerization cross-linked polyurethane so that the polyurethane tool after depolymerization
Have temperature flowing and machinability, directly apply to the production of articles in downstream, solve pollution and the poor efficiency of traditional treatment method
Rate 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 polyurethane 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 polyurethane can not
Being 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 polyurethane, it is characterised in that step is as follows:
Step 1) pretreatment of waste and old cross-linked polyurethane:Waste and old cross-linked polyurethane is carried out surface spraying cleaning and ultraviolet kills
Bacterium;
Step 2) waste and old cross-linked polyurethane depolymerization reclaim:By step 1) process after waste and old cross-linked polyurethane after crushed, add
Enter extruder, under high temperature and alternating shear effect so that the strand generation depolymerization of cross-linked polyurethane, it is achieved recycle.
2. the recovery process of waste and old cross-linked polyurethane 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 polyurethane according to claim 1, it is characterised in that described extruder is same
To double screw extruder.
4. the recovery process of waste and old cross-linked polyurethane according to claim 1, it is characterised in that described waste and old crosslinking gathers
Urethane is crushed to the particle that particle diameter is 0.5-1cm.
5. the recovery process of the waste and old cross-linked polyurethane according to Claims 2 or 3, it is characterised in that described extruder
Extrusion temperature is 275~285 DEG C, and die pressure is 12~18MPa.
6. the recovery process of waste and old cross-linked polyurethane according to claim 5, it is characterised in that described extruder screw
Draw ratio is 56~60, and screw speed is 800~1000rpm.
7. the recovery process of waste and old cross-linked polyurethane according to claim 6, it is characterised in that the screw rod of described extruder
It is 5~8 that combination keeps the alternating cycles of shearing force.
Priority Applications (1)
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CN201610655926.3A CN106426636A (en) | 2016-08-11 | 2016-08-11 | Recovery process of waste cross-linked polyurethane |
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CN201610655926.3A CN106426636A (en) | 2016-08-11 | 2016-08-11 | Recovery process of waste cross-linked polyurethane |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107383305A (en) * | 2017-08-23 | 2017-11-24 | 北京家美科技有限公司 | Difficult degradation technical polyurethane product waste regenerated Application way and reconstituted product |
CN107511947A (en) * | 2017-08-15 | 2017-12-26 | 滁州市玉林聚氨酯有限公司 | A kind of recoverying and utilizing method of polyurethane elastomer waste material |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104385485A (en) * | 2014-10-08 | 2015-03-04 | 四川大学 | Waste crosslinked polyethylene recovered material and recovery method thereof |
CN104974376A (en) * | 2015-07-22 | 2015-10-14 | 南京顺长塑料机械有限公司 | Recovery technique of vulcanized rubber waste |
CN105061805A (en) * | 2015-07-22 | 2015-11-18 | 浙江大学 | Recovery process for crosslinked polyethylene wastes |
-
2016
- 2016-08-11 CN CN201610655926.3A patent/CN106426636A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104385485A (en) * | 2014-10-08 | 2015-03-04 | 四川大学 | Waste crosslinked polyethylene recovered material and recovery method thereof |
CN104974376A (en) * | 2015-07-22 | 2015-10-14 | 南京顺长塑料机械有限公司 | Recovery technique of vulcanized rubber waste |
CN105061805A (en) * | 2015-07-22 | 2015-11-18 | 浙江大学 | Recovery process for crosslinked polyethylene wastes |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107511947A (en) * | 2017-08-15 | 2017-12-26 | 滁州市玉林聚氨酯有限公司 | A kind of recoverying and utilizing method of polyurethane elastomer waste material |
CN107383305A (en) * | 2017-08-23 | 2017-11-24 | 北京家美科技有限公司 | Difficult degradation technical polyurethane product waste regenerated Application way and reconstituted product |
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