CN106426636A - Recovery process of waste cross-linked polyurethane - Google Patents

Recovery process of waste cross-linked polyurethane Download PDF

Info

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
Authority
CN
China
Prior art keywords
linked polyurethane
waste
cross
recovery process
extruder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610655926.3A
Other languages
Chinese (zh)
Inventor
黄云鸿
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guilin Chunxiao Environmental Protection Technology Co Ltd
Original Assignee
Guilin Chunxiao Environmental Protection Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guilin Chunxiao Environmental Protection Technology Co Ltd filed Critical Guilin Chunxiao Environmental Protection Technology Co Ltd
Priority to CN201610655926.3A priority Critical patent/CN106426636A/en
Publication of CN106426636A publication Critical patent/CN106426636A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • 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

A kind of recovery process of waste and old cross-linked polyurethane
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.
CN201610655926.3A 2016-08-11 2016-08-11 Recovery process of waste cross-linked polyurethane Pending CN106426636A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610655926.3A CN106426636A (en) 2016-08-11 2016-08-11 Recovery process of waste cross-linked polyurethane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610655926.3A CN106426636A (en) 2016-08-11 2016-08-11 Recovery process of waste cross-linked polyurethane

Publications (1)

Publication Number Publication Date
CN106426636A true CN106426636A (en) 2017-02-22

Family

ID=58185033

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610655926.3A Pending CN106426636A (en) 2016-08-11 2016-08-11 Recovery process of waste cross-linked polyurethane

Country Status (1)

Country Link
CN (1) CN106426636A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
CN105061805B (en) A kind of recovery process of crosslinked polyethylene waste
CN105061806B (en) A kind of recovery process of ultra-high molecular weight polyethylene discarded object
CN109049391B (en) Method for recycling waste PET bottle flakes
CN106426636A (en) Recovery process of waste cross-linked polyurethane
CN104385485A (en) Waste crosslinked polyethylene recovered material and recovery method thereof
CN106496631A (en) The method that overcritical fluid-mixing reclaims carbon fiber enhancement resin base composite material
CN106279753A (en) A kind of recovery process of waste and old crosslinked polypropylene
CN104974376B (en) A kind of recovery process for vulcanizing rubber discarded object
CN105017581A (en) Method for preparing modified waste rigid polyurethane foaming plastic active micro-powder reinforcing rubber material
CN105254919A (en) Method for preparing environment-friendly high-strength tire reclaimed rubber through microwaves
CN106273050A (en) A kind of prilling of regenerated plastics
CN203854114U (en) Plastic cleaning equipment for stripping plastic adhesive layer
CN106432796A (en) Recovery process of waste cross-linked polyamide
CN108707249A (en) A kind of recovery process of waste and old cross-linked polrvinyl chloride
CN106432797A (en) Recycling technology of waste crosslinked polycarbonate
CN106432798A (en) Recovery process of waste cross-linked polyethylene terephthalate
CN106432789A (en) Recycling technology of waste crosslinked poly(diallyl terephthalate)
CN106432790A (en) Waste cross-linked polyvinyl chloride recovering technology
CN108530934A (en) A kind of waste plastic recovery method
CN110157037A (en) A kind of Waste rubber desulfurization new process
CN102728584B (en) A kind of depainting cleaning method and depainting cleaning agent thereof
CN107415088A (en) Fiber reinforced thermosetting resin material recovery preparation method for material
CN107880357A (en) A kind of preparation for processing of regeneration PE plastics
CN103554628B (en) Waste and old crosslinked PE CABLE MATERIALS reclaims modification and produces special material for tube and preparation method thereof
Alias et al. Terephthalic Acid (TPA) Recovery from Plastic Bottle of Polyethylene Terephthalate (PET) through Hydrolysis Treatment

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20170222

RJ01 Rejection of invention patent application after publication