CN108707249A - A kind of recovery process of waste and old cross-linked polrvinyl chloride - Google Patents
A kind of recovery process of waste and old cross-linked polrvinyl chloride Download PDFInfo
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- CN108707249A CN108707249A CN201810368751.7A CN201810368751A CN108707249A CN 108707249 A CN108707249 A CN 108707249A CN 201810368751 A CN201810368751 A CN 201810368751A CN 108707249 A CN108707249 A CN 108707249A
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- waste
- polrvinyl chloride
- linked polrvinyl
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- 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
- 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
-
- 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
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2327/06—Homopolymers or copolymers of vinyl chloride
-
- 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)
- Physics & Mathematics (AREA)
- Thermal 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 present invention relates to a kind of recovery process of waste and old cross-linked polrvinyl chloride, and steps are as follows：The pretreatment of the waste and old cross-linked polrvinyl chloride of step 1)：Waste and old cross-linked polrvinyl chloride is subjected to surface spraying cleaning and ultraviolet sterilization；The depolymerization of the waste and old cross-linked polrvinyl chloride of step 2) is recycled：After crushed by step 1) treated waste and old cross-linked polrvinyl chloride, extruder is added, under high temperature and alternating shear effect so that depolymerization occurs for the strand of cross-linked polrvinyl chloride, realizes and recycles.The beneficial effects of the invention are as follows：It can with environment-friendly high-efficiency depolymerization cross-linked polrvinyl chloride so that the polyvinyl chloride after depolymerization has temperature flowing and machinability, directly applies to the production of articles in downstream, solves pollution and the low efficiency problem of traditional treatment method.
Description
Technical field
The present invention relates to the recycling fields of resource, are specifically related to a kind of recycling work of waste and old cross-linked polrvinyl chloride
Skill.
Background technology
The difficult recycling of cross-linked polrvinyl chloride, crosslinks just because of its strand, forms space network.Very certainly
So, the recycling that realize cross-linked polrvinyl chloride destroys its space network, makes the cross-linked structure of molecule interchain that depolymerization occur disconnected
Key, so that it may realize the recycling of cross-linked polrvinyl chloride.
There are two types of methods, i.e. chemical method and physical method for the destruction of chemical bond.Chemical method is to utilize chemical assistant, such as
Organic disulfide, mercaptan, alkali metal etc. carry out attack destruction so that crosslinking by these auxiliary agents to cross-bond at high temperature
Key disconnects, while the active chain end of disconnection can also be carried out inertia end seal by these substances, and the cross-bond avoided damage to is crosslinked again,
Cross-linked polrvinyl chloride is just depolymerized to non-crosslinked polyvinyl chloride in this way, has flowability and processability, can be as thermoplasticity polychlorostyrene
Ethylene equally recycles.Chemical method needs that chemical assistant is added, and cost improves, and in depolymehzation process, will produce big
The corrosivity or toxic gas of amount easily cause secondary pollution, 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 knot of cross-linked polrvinyl chloride
Structure destroys, and the such material of two-dimensional structure of the low relative molecular weight of formation line style linear chain or branched chain type has temperature flowing and can
Processability and be regenerated utilization.Currently used is the method for microwave or ultrasonic wave, although physical method is not due to having chemistry
The addition of substance will not cause secondary pollution, relatively environment-friendly, but the equipment investment of these methods is big, be difficult to realize continuous metaplasia
Production, therefore efficiency is very low, it is difficult to realize in large-scale industrial production field, laboratory stage is rested on mostly.
For existing recycling cross-linked polrvinyl chloride waste method problem encountered, need to study efficiently without secondary dirt
The new recovery and treatment method of dye.
Invention content
Technical problem to be solved by the invention is to provide a kind of recovery process of waste and old cross-linked polrvinyl chloride.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of recovery process of waste and old cross-linked polrvinyl chloride,
Steps are as follows：
The pretreatment of the waste and old cross-linked polrvinyl chloride of step 1)：Waste and old cross-linked polrvinyl chloride is subjected to surface spraying cleaning and purple
Outside line is sterilized；
The depolymerization of the waste and old cross-linked polrvinyl chloride of step 2) is recycled：By step 1) treated waste and old cross-linked polrvinyl chloride through powder
After broken, extruder is added, under high temperature and alternating shear effect so that depolymerization occurs for the strand of cross-linked polrvinyl chloride, realizes
It recycles.
The beneficial effects of the invention are as follows：It can with environment-friendly high-efficiency depolymerization cross-linked polrvinyl chloride so that the polychlorostyrene second after depolymerization
Alkene have temperature flowing and machinability, directly apply to the production of articles in downstream, solve traditional treatment method pollution and
Low efficiency problem.
Based on the above technical solution, the present invention can also be improved as follows：
Further, the extrusion temperature of the extruder is 240~300 DEG C；The processing time of the material is 30-60s；
The extruder is single screw extrusion machine or double screw extruder；The draw ratio of the extruder screw be 56~
80, screw speed is 400~1200rpm so that the cutter shearing line speed that material is born is 4-8m/s；The screw rod group of the extruder
It is 2~10 to close and keep the alternating cycles of shearing force.
Further, the extruder is parallel dual-screw extruding machine.
Further, the waste and old cross-linked polrvinyl chloride is crushed to the particle that grain size is 0.5-1cm.
Further, the extrusion temperature of the extruder is 275~285 DEG C, and die pressure is 12~18MPa.
Further, the draw ratio of the extruder screw is 52~60, and screw speed is 800~1000rpm.
Further, it is 5~8 that the screw combinations of the extruder, which keep the alternating cycles of shearing force,.
Specific implementation mode
The principles and features of the present invention are described below, and the given examples are served only to explain the present invention, is not intended to limit
Determine the scope of the present invention.
Embodiment 1
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of recovery process of waste and old cross-linked polrvinyl chloride,
Steps are as follows：
The pretreatment of the waste and old cross-linked polrvinyl chloride of step 1)：Waste and old cross-linked polrvinyl chloride is subjected to surface spraying cleaning and purple
Outside line is sterilized；
The depolymerization of the waste and old cross-linked polrvinyl chloride of step 2) is recycled：By step 1) treated waste and old cross-linked polrvinyl chloride through powder
After broken, extruder is added, under high temperature and alternating shear effect so that depolymerization occurs for the strand of cross-linked polrvinyl chloride, realizes
It recycles.
The beneficial effects of the invention are as follows：It can with environment-friendly high-efficiency depolymerization cross-linked polrvinyl chloride so that the polychlorostyrene second after depolymerization
Alkene have temperature flowing and machinability, directly apply to the production of articles in downstream, solve traditional treatment method pollution and
Low efficiency problem.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the extrusion temperature of the extruder is 240 DEG C；The processing time of the material is 30s；
The extruder is parallel dual-screw extruding machine；The draw ratio of the extruder screw is 56, and screw speed is
400rpm, die pressure 128MPa so that the cutter shearing line speed that material is born is 4m/s；The screw combinations of the extruder are protected
The alternating cycles for holding shearing force are 2.
Further, the waste and old cross-linked polrvinyl chloride is crushed to the particle that grain size is 0.5cm.
Embodiment 2
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of recovery process of waste and old cross-linked polrvinyl chloride,
Steps are as follows：
The pretreatment of the waste and old cross-linked polrvinyl chloride of step 1)：Waste and old cross-linked polrvinyl chloride is subjected to surface spraying cleaning and purple
Outside line is sterilized；
The depolymerization of the waste and old cross-linked polrvinyl chloride of step 2) is recycled：By step 1) treated waste and old cross-linked polrvinyl chloride through powder
After broken, extruder is added, under high temperature and alternating shear effect so that depolymerization occurs for the strand of cross-linked polrvinyl chloride, realizes
It recycles.
The beneficial effects of the invention are as follows：It can with environment-friendly high-efficiency depolymerization cross-linked polrvinyl chloride so that the polychlorostyrene second after depolymerization
Alkene have temperature flowing and machinability, directly apply to the production of articles in downstream, solve traditional treatment method pollution and
Low efficiency problem.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the extrusion temperature of the extruder is 300 DEG C；The processing time of the material is 60s；
The extruder is single screw extrusion machine；The draw ratio of the extruder screw is 80, and screw speed is
1200rpm so that the cutter shearing line speed that material is born is 8m/s, die pressure 18MPa；The screw combinations of the extruder are protected
The alternating cycles for holding shearing force are 10.
Further, the waste and old cross-linked polrvinyl chloride is crushed to the particle that grain size is 1cm.
Embodiment 3
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of recovery process of waste and old cross-linked polrvinyl chloride,
Steps are as follows：
The pretreatment of the waste and old cross-linked polrvinyl chloride of step 1)：Waste and old cross-linked polrvinyl chloride is subjected to surface spraying cleaning and purple
Outside line is sterilized；
The depolymerization of the waste and old cross-linked polrvinyl chloride of step 2) is recycled：By step 1) treated waste and old cross-linked polrvinyl chloride through powder
After broken, extruder is added, under high temperature and alternating shear effect so that depolymerization occurs for the strand of cross-linked polrvinyl chloride, realizes
It recycles.
The beneficial effects of the invention are as follows：It can with environment-friendly high-efficiency depolymerization cross-linked polrvinyl chloride so that the polychlorostyrene second after depolymerization
Alkene have temperature flowing and machinability, directly apply to the production of articles in downstream, solve traditional treatment method pollution and
Low efficiency problem.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the extrusion temperature of the extruder is 275 DEG C；The processing time of the material is 45s；
The extruder is double screw extruder；The draw ratio of the extruder screw is 56, and screw speed is
800rpm, die pressure are that 12MPa so that the cutter shearing line speed that material is born is 6m/s；The screw combinations of the extruder are kept
The alternating cycles of shearing force are 5.
Further, the waste and old cross-linked polrvinyl chloride is crushed to the particle that grain size is 0.8cm.
Embodiment 4
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of recovery process of waste and old cross-linked polrvinyl chloride,
Steps are as follows：
The pretreatment of the waste and old cross-linked polrvinyl chloride of step 1)：Waste and old cross-linked polrvinyl chloride is subjected to surface spraying cleaning and purple
Outside line is sterilized；
The depolymerization of the waste and old cross-linked polrvinyl chloride of step 2) is recycled：By step 1) treated waste and old cross-linked polrvinyl chloride through powder
After broken, extruder is added, under high temperature and alternating shear effect so that depolymerization occurs for the strand of cross-linked polrvinyl chloride, realizes
It recycles.
The beneficial effects of the invention are as follows：It can with environment-friendly high-efficiency depolymerization cross-linked polrvinyl chloride so that the polychlorostyrene second after depolymerization
Alkene have temperature flowing and machinability, directly apply to the production of articles in downstream, solve traditional treatment method pollution and
Low efficiency problem.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the extrusion temperature of the extruder is 285 DEG C；The processing time of the material is 50s；
The extruder is single screw extrusion machine or double screw extruder；The draw ratio of the extruder screw is 60,
Screw speed is 1000rpm so that the cutter shearing line speed that material is born is 5m/s, die pressure 15MPa；The extruder
It is 8 that screw combinations, which keep the alternating cycles of shearing force,.
Further, the waste and old cross-linked polrvinyl chloride is crushed to the particle that grain size is 0.7cm.
Comparative example 1
Material, equipment and processing technology are same as Example 1, and screw speed is set as 300rpm.Cross-linked polrvinyl chloride is not
It can be granulated by double screw extruder, the performance parameter of material is shown in Table 1.
The performance parameter of 1 embodiment 1-4 of table and the material in comparative example 1
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of recovery process of waste and old cross-linked polrvinyl chloride, which is characterized in that steps are as follows：
The pretreatment of the waste and old cross-linked polrvinyl chloride of step 1)：Waste and old cross-linked polrvinyl chloride is subjected to surface spraying cleaning and ultraviolet light
Sterilization；
The depolymerization of the waste and old cross-linked polrvinyl chloride of step 2) is recycled：By step 1) treated waste and old cross-linked polrvinyl chloride through crushing
Afterwards, extruder is added, under high temperature and alternating shear effect so that depolymerization occurs for the strand of cross-linked polrvinyl chloride, realizes back
It receives and utilizes.
2. the recovery process of waste and old cross-linked polrvinyl chloride according to claim 1, which is characterized in that
The extrusion temperature of the extruder is 240~300 DEG C；
The processing time of the material is 30-60s；
The extruder is single screw extrusion machine or double screw extruder；
The draw ratio of the extruder screw is 52~80, and screw speed is 400~1200rpm so that the shearing that material is born
Linear velocity is 4-8m/s；
It is 2~10 that the screw combinations of the extruder, which keep the alternating cycles of shearing force,.
3. the recovery process of waste and old cross-linked polrvinyl chloride according to claim 1, which is characterized in that the extruder is
Parallel dual-screw extruding machine.
4. the recovery process of waste and old cross-linked polrvinyl chloride according to claim 1, which is characterized in that the waste and old crosslinking
Polyvinyl chloride is crushed to the particle that grain size is 0.5-1cm.
5. the recovery process of waste and old cross-linked polrvinyl chloride according to claim 2 or 3, which is characterized in that the extruder
Extrusion temperature be 275~285 DEG C, die pressure be 12~18MPa.
6. the recovery process of waste and old cross-linked polrvinyl chloride according to claim 5, which is characterized in that the extruder screw
Draw ratio be 56~60, screw speed be 800~1000rpm.
7. the recovery process of waste and old cross-linked polrvinyl chloride according to claim 6, which is characterized in that the spiral shell of the extruder
It is 5~8 that bar combination, which keeps the alternating cycles of shearing force,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810368751.7A CN108707249A (en) | 2018-04-23 | 2018-04-23 | A kind of recovery process of waste and old cross-linked polrvinyl chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810368751.7A CN108707249A (en) | 2018-04-23 | 2018-04-23 | A kind of recovery process of waste and old cross-linked polrvinyl chloride |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108707249A true CN108707249A (en) | 2018-10-26 |
Family
ID=63866959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810368751.7A Withdrawn CN108707249A (en) | 2018-04-23 | 2018-04-23 | A kind of recovery process of waste and old cross-linked polrvinyl chloride |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108707249A (en) |
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2018
- 2018-04-23 CN CN201810368751.7A patent/CN108707249A/en not_active Withdrawn
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181026 |
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| WW01 | Invention patent application withdrawn after publication |