CN105061805A - Recovery process for crosslinked polyethylene wastes - Google Patents
Recovery process for crosslinked polyethylene wastes Download PDFInfo
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- CN105061805A CN105061805A CN201510432185.8A CN201510432185A CN105061805A CN 105061805 A CN105061805 A CN 105061805A CN 201510432185 A CN201510432185 A CN 201510432185A CN 105061805 A CN105061805 A CN 105061805A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- 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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Abstract
The invention discloses recovery process for crosslinked polyethylene wastes. The process comprises the following steps: crushing the crosslinked polyethylene wastes and then adding the crushed wastes into an extruder, subjecting a molecular chain of the crosslinked polyethylene to depolymerization under the actions of high temperature and alternating shear so as to realize recycling, wherein an extrudision temperature of the extruder is 240 to 300 DEG C, and die pressure is 3 to 20 MPa; a screw of the extruder has a length-diameter ratio of 56 to 80 and a rotating speed of 400 to 1200 rpm, so shear line speed exerted on a material is more than 4 m/s; the alternation cycle of maintaining shear force of a screw combination of the extruder is 2 to 10 cycles; processing time of the material is more than 30s; and the extruder is a single-screw extruder or a double-screw extruder. The recovery process provided by the invention can depolymerize the crosslinked polyethylene with environmental protection and high efficiency and enables the depolymerized crosslinked polyethylene to have high mobility and machinability.
Description
Technical field
The present invention relates to the recovery of polymeric scrap material, regeneration field, particularly relate to a kind of recovery process of crosslinked polyethylene waste.
Background technology
Cross-linking polyethylene materials, also known as XLPE, be prepared from by chemically crosslinked (through superoxide or crosslinked with silicane) or cross-linking radiation (irradiation agent adds irradiation ray) method, its mechanical strength is high, high-low temperature resistant and creep-resistant property superior, be used widely in communication, power cable sheath material, XLPE hot-water line, automobile and electrical component and crosslinked foam etc.But because XLPE belongs to a kind of thermosetting material, its performance and thermoplastic material are completely different, this material does not dissolve, non-fusible, owing to there is no processing fluidity, therefore regenerate difficult processing with straight forming, no matter be chemically crosslinked or cross-linking radiation, be all difficult to recovery and reuse.Cable Renewal process and XLPE tubing are produced, installation process all can produce the crosslinked polyethylene waste being difficult in a large number reclaim, and main employing landfill or burning disposal, cause environmental pollution and the wasting of resources at present.Therefore developing the recycling new technology of XLPE waste material, is the important subject realizing the recycling utilization of resource, energy-saving and emission-reduction, recycling economy and environmental improvement.
The difficulty of crosslinked polyethylene reclaims, and occurs crosslinked, define tridimensional network just because of its molecular chain.Very natural, the recovery of crosslinked polyethylene be realized, destroy its tridimensional network, make the crosslinking structure generation depolymerization scission of link between molecular chain, just can realize the recovery of crosslinked polyethylene.
The destruction of chemical bond has two kinds of methods, i.e. chemical process and physical method.Chemical process utilizes chemical assistant, as organic disulfide, mercaptan, basic metal etc., at high temperature, carry out attack destruction by these auxiliary agents to cross-link bond, cross-link bond is disconnected, these materials can also carry out inertia end envelope the active chain end disconnected simultaneously, the cross-link bond destroyed is avoided again to be cross-linked, such crosslinked polyethylene is just depolymerized to non-cross-linked polyvinyl, has flowable and processibility, can recycle as thermoplastic polyethylene.Chemical process needs to add chemical assistant, and cost improves, and in depolymehzation process, can produce a large amount of corrodibility or toxic gas, easily cause secondary pollution, and therefore chemical process is not a kind of environmental protection effective means.
Physical method does not add chemical substance, just utilize external energy, the dimensional network structure of crosslinked polyethylene is destroyed, and the such material of two-dirnentional structure forming the low relative molecular weight of line style straight or branched type has temperature flowing and workability and is able to regeneration.Conventional is microwave or hyperacoustic method at present, although physical method is not owing to having adding of chemical substance, secondary pollution can not be caused, relative environmental protection, but the facility investment of these methods is large, and be difficult to realize continuous prodution, therefore efficiency is very low, be difficult in large-scale industrial production field realize, mostly rest on laboratory stage.
For existing recovery crosslinked polyethylene waste method institute problems faced, need the new recovery and treatment method studying efficient non-secondary pollution.
Summary of the invention
The invention provides a kind of recovery process of crosslinked polyethylene waste, can environment-friendly high-efficiency ground depolymerization crosslinked polyethylene, make the polyethylene after depolymerization have temperature flowing and workability, directly apply to the production of articles in downstream, solve pollution and the low efficiency problem of traditional treatment method.
A recovery process for crosslinked polyethylene waste, step is as follows:
Crosslinked polyethylene waste after crushed, adds forcing machine, under high temperature and alternating shear effect, makes the molecular chain generation depolymerization of crosslinked polyethylene, realizes recycling;
The extrusion temperature of described forcing machine is 240 ~ 300 DEG C, and die pressure is 3 ~ 20MPa;
The length-to-diameter ratio of described extruder screw is 56 ~ 80, and screw speed is 400 ~ 1200rpm, the shear line speed >4m/s that material is born;
The shear line speed that described material bears also refers to the linear velocity of screw rod end;
The screw combinations of described forcing machine keeps the alternating cycles of shearing force to be 2 ~ 10;
The treatment time >30s of described material, the treatment time of material refers to that material bears the action time of high temperature Strong shear;
Described forcing machine is single screw extrusion machine or twin screw extruder.
As preferably, described forcing machine is twin screw extruder; More preferably parallel dual-screw extruding machine.
Described crosslinked polyethylene waste needs the bulk or the flap that are first crushed to 2 ~ 4cm, then adds in forcing machine.
As preferably, the extrusion temperature of described forcing machine is 260 ~ 300 DEG C, and die pressure is 15 ~ 20MPa.Further preferably, the length-to-diameter ratio of described extruder screw is 72 ~ 80, and screw speed is 500 ~ 1200rpm.Preferred again, the screw combinations of described forcing machine keeps the alternating cycles of shearing force to be 6 ~ 10.
More preferably, the extrusion temperature of described forcing machine is 260 ~ 280 DEG C, and die pressure is 15 ~ 20MPa, and the length-to-diameter ratio of screw rod is 72 ~ 80, and screw speed is 500 ~ 600rpm, and screw combinations keeps the alternating cycles of shearing force to be 6 ~ 8.Adopt above-mentioned preferred expressing technique, the depolymerization of crosslinked polyethylene can be realized fast and efficiently, and the excellent performance after regeneration.
Ultimate principle of the present invention is: under high temperature and the effect of alternation Strong shear, is made the molecular chain generation depolymerization of crosslinked polyethylene, thus realize the recycling of cross-linking polyethylene materials waste by physical action.Its basic technology is: (1) treatment temp: 240 DEG C ~ 300 DEG C; (2) for realizing Strong shear, the shear line speed >4m/s that material bears; (3) the treatment time >30s of material; (4) alternating cycles of Strong shear power that material bears is 2 ~ 10.In industrial processes, the parallel dual-screw extruding machine designed by special construction, counter rotation twin screw extruder or single screw extrusion machine continuous seepage, special construction for forcing machine requires: forcing machine slenderness ratio is: 56 ~ 80, and screw combinations keeps the alternating cycles of shearing force to be 2 ~ 10.And for the basic complete processing of forcing machine be: 1) Heating temperature: 240 DEG C ~ 300 DEG C; (2) screw speed: 400 ~ 1200rpm; (3) die pressure 3 ~ 20MPa.The recycle of cross-linking polyethylene materials waste can be realized by the method, both protected environment, huge economic benefit can also be created.
The Heating temperature of forcing machine above-mentioned in the present invention, is the top temperature that forcing machine is arranged.
To elaborate to the present invention below.
Present patent application recycles for the purpose of cross-linking polyethylene materials waste by environment-friendly high-efficiency, and patent inventor this has been extensive and deep research.For depolymerize mechanism and the existing recovery cross-linking polyethylene materials of cross-linked polymer method, how environment-friendly high-efficiency rate realization of industrialization has carried out exploratory development.
Polyethylene molecular chain occurs crosslinked, linear straight chain molecular structure becomes tridimensional network, slippage between molecular chain is prevented from, therefore crosslinked polyethylene is macroscopically showing as insoluble and is not melting, temperature flowing and workability is not had yet, waste can not be processed into goods by dissolving or melting again again, is correspondingly lost recovery value.Realize the recovery value of crosslinked polyethylene, it is crucial for destroying its tridimensional network, and the molecular structure forming linear straight chain could recover its workability.
The molecular stereo reticulated structure of crosslinked polyethylene, is actually the carbon-carbon bond forming tridimensional network, destroys the tridimensional network of crosslinked polyethylene, in fact needs some carbon-carbon bonds destroyed wherein.According to the thermodynamic argument of chemical bond, destroying carbon-carbon bond needs to provide enough energy, and namely the extraneous energy provided is greater than the molecular bond energy of carbon-carbon bond.The energy destroyed needed for carbon-carbon bond is provided by two kinds of methods usually, one is chemical process, by the attack of chemical substance to carbon-carbon bond, reduce the bond energy of carbon-carbon bond, thus make chemical bond absorption energy fracture and depolymerization, at present, chemical process is not also very effective to crosslinked polyethylene, namely be not easy to find very suitable chemical substance can produce destruction to carbon-carbon bond efficiently, and the chemical process reported, then efficiency is not high, and corrodibility or toxic gas can be produced in process, produce secondary pollution, therefore presently, chemical process process crosslinked polyethylene is also immature, also not environmentally.Another kind is physical method, and it mainly provides heat to cross-linked polymer, provides heat by microwave or hyperacoustic method to material, and when heat is greater than the bond energy of carbon-carbon bond, chemical bond is destroyed and depolymerization occurs.Although physical method does not have adding of chemical substance, secondary pollution can not be caused, relative environmental protection, but the facility investment of these methods is large, and be difficult to realize continuous prodution, therefore efficiency is very low, be difficult in large-scale industrial production field realize, mostly rest on laboratory stage.
Therefore the method for existing depolymerization crosslinked polyethylene is also immature, in order to realize the recovery of high-efficiency environment friendly, inventor herein is through further investigation for this reason, propose new deagglomeration principle: under high temperature and the effect of alternation Strong shear, made the molecular chain generation depolymerization of crosslinked polyethylene by physical action, thus realize the recycling of cross-linking polyethylene materials waste.
First, physical method is the method for most environmental protection, but the key of physical method how provides enough energy to destroy carbon-carbon bond to crosslinked polyethylene efficiently.Heat is provided to material, basic mode comprises thermal conduction (well heater heat supply), thermal radiation (ultrasonic wave or microwave), thermal radiation needs special equipment, expensive, dimension-limited, therefore not economical and efficient, and heat exchange pattern is by heat source temperature, the thermal conductivity of material, many-sided impact such as viscosity and flow state, efficiency is lower, and be difficult to make material evenly and to control accurate temperature more difficult, the heat provided or be not enough to destroy carbon carbon cross-link bond, local is too high decomposes, become low molecular weight substance and even carbonize blackout and the performance that loses as material.Therefore there is a kind of high temperature recovery method in the recovery field of crosslinked polyethylene, i.e. crosslinked polyethylene oil refining, crosslinked polyethylene is changed into the fluid organic material of low-carbon (LC) by the method for heat, but the method efficiency is very low, transformation efficiency is not high, and the unmanageable three wastes that by-product is a large amount of, current this method is abandoned, therefore can't realize the recycling of high-efficiency environment friendly only by heat exchange pattern.
Except giving cross-linked polymer heat supply and making carbon-carbon bond destruction, can also by the mode sheared, the shearing force that carbon-carbon bond is subject to exceedes the chemical bond power of carbon-carbon bond.Shearing force is a kind of macroscopical reactive force, and chemical bond power connects the reactive force between atom, it is a kind of micro force, to destroy carbon-carbon bond by effective shearing action, but there is several factor to need to consider: first, how give the shearing force that material is enough, and effectively this macroscopical effort on microcosmic atom, this is crucial.Secondly, only going to destroy carbon carbon chemical bond by shearing force may be also not enough, can also by heat conducting mode to material energy, and auxiliary shearing force goes to destroy cross-link bond.3rd, we recycle crosslinked polyethylene, wish that material has workability, also to there is the performance of material simultaneously, namely can not all chemical bonds in saboteur's structure, make molecular weight not reduce too much, the effect therefore how effectively controlling shearing force is also need to consider.Based on this understanding, through research, we have proposed the ultimate principle reclaiming crosslinked polyethylene: under utilizing high temperature and the effect of alternation Strong shear, made the molecular chain generation depolymerization of crosslinked polyethylene by physical action, thus realize the recycling of cross-linking polyethylene materials waste.
By further studying discovery, for realizing effective depolymerization of crosslinked polyethylene, required basic technology is: (1) treatment temp: 240 DEG C ~ 300 DEG C; (2) for realizing Strong shear, the shear line speed >4m/s that material bears; (3) the treatment time >30s of material; (4) alternating cycles of Strong shear power that material bears is 2 ~ 10.To heating material, certain energy is provided, auxiliary shearing force is to the destruction of cross-link bond, the effect of shearing force can be reduced, according to the feature of crosslinked polyethylene, within the scope of 240 ~ 300 DEG C, can not there is the problem that scission of link decomposes in material, and linear polyethylene melting can be made and there is mobility after cross-link bond depolymerization, be conducive to direct granulating and forming.And shearing force refers in action material, make the cross section of material that the reactive force of the relative changing of the relative positions occur, and usually apply shearing force be by rotate force object, by rotation at a high speed, shearing force is produced to material, the size of shearing force can be weighed by the end linear velocity of the object that exerts a force, and find through research, the shear line speed that material bears must meet >4m/s, the shearing force acted on like this on material could destroy the reactive force of carbon-carbon bond, and depolymerization is occurred.In order to the polyethylene after depolymerization has temperature flowing and enough mechanical properties, more than 50% of tridimensional network must be made to destroy, usually the crosslinking degree of exosyndrome material is carried out with gel content, the gel content of complete crosslinked polyethylene is close to 100%, and gel content requires lower than 50% after depolymerization, reach this depolymerization degree, the high temperature Strong shear that material bears needs >30s action time.In order to control depolymerization degree, keep the mechanical strength after crosslinked polyethylene depolymerization, namely gel content can not be too high, can not be too low, therefore we adopt alternation formula shearing action mode, the depolymerization degree controlled as required, and the alternating cycles that material bears is 2 ~ 10.
For above-mentioned processing requirement, industrial high efficiency be realized and produce, the parallel dual-screw extruding machine that special construction can be selected to design, counter rotation twin screw extruder or single screw extrusion machine continuous seepage.Forcing machine is a kind of device of plastic processing of maturation, temperature is provided to material by heating, and the high speed rotating of screw rod can produce Strong shear acts on material, the element be enclosed within screw rod can be prepared into the flow guiding unit of various types and carry out independent assortment, effectively control the conveying of material in barrel and mixing, and according to the ultimate principle of the inventive method, by the combination of different screw units, the alternating shear cycle can be controlled easily.For single screw extrusion machine, its shearing force is produced by the speed of relative movement between the screw rod rotated and static barrel wall, and twin screw extruder, shearing force is then the rotary motion come between two screw rods and between screw rod and barrel, therefore for method of the present invention, both can be realized by single screw extrusion machine, also can be realized by twin screw extruder, and from the action effect of shearing force, twin screw extruder better effects if, and parallel dual-screw is preferred.
For forcing machine, the size of shearing force is except the base type of screw rod, also relevant to screw speed and screw diameter, screw speed is faster, shearing force is stronger, and screw diameter is larger, shearing force is also larger, but the speed of rotating speed determines by the power of motor and the intensity of screw rod driving bolt rotary, the rotating speed of screw rod is faster, because crosslinked polyethylene is high viscosity and high coagulant state in screw rod, viscosity is very large, high rotating speed needs larger power of motor, screw rod is while providing the shearing force that material is enough large simultaneously, self also will bear large shearing force, therefore high requirement is proposed to the intensity of screw rod.
For parallel dual-screw, meet aforesaid processing requirement, then its special structural requirement is: forcing machine slenderness ratio is: 56-80, and screw combinations keeps the alternating cycles of shearing force to be 2 ~ 10.And when depolymerization cross-linking polyethylene materials, the processing condition of forcing machine are set to: 1) Heating temperature: 240 ~ 300 DEG C; (2) screw speed: 400 ~ 1200rpm; (3) die pressure 3 ~ 20MPa.
By this technique, can realize the recycling to crosslinked polyethylene, clearly, by ordinary method, granulation of having no way in twin screw extruder, material, owing to substantially not there is not depolymerization, does not have melting in screw rod, so there is no mobility, substantially can not be shaping.And by method of the present invention, same material, has carried out effective depolymerization to crosslinked polyethylene, material melt-flowable, can granulation again, and particle surface gloss is normal, mechanics of materials intensity and linear polyethylene close.
Compared with prior art, tool of the present invention has the following advantages:
The method of recovery crosslinked polyethylene provided by the invention; utilize high temperature and alternation Strong shear reactive force; realize continuous depolymerization in an extruder; because depolymehzation process does not have the effect of chemical substance, also do not produce " three wastes ", thus crosslinked polyethylene can be recycled in high-efficiency environment friendly ground; can protection of the environment; economize on resources, the utility value of crosslinked polyethylene waste can be improved again, can huge economic benefit be created.
Embodiment
Embodiment 1
Cross-linked poly-ethylene cable material waste is crushed to bulk or the flap of 2 ~ 4cm size by pulverizer, use the parallel dual-screw extruding machine of peculiar set-up, the basic configuration of forcing machine is: screw diameter D=65mm, length-to-diameter ratio L/D=72, power of motor is P=120KW, and screw combinations is set to 8 alternating shear power cycles.Forcing machine fabrication process condition is: top temperature is 280 DEG C, and screw speed is 600rpm, die pressure 15MPa.Crosslinked polyethylene is through forcing machine depolymerization, and can realize granulation, before and after granulation, material properties is as shown in table 1.
Table 1
| Performance perameter | Before depolymerization | After depolymerization |
| Gel content (%) | 100 | 22.3 |
| Melting index (g/10min190 DEG C of 2.16Kg) | Do not flow | 6.2 |
| Tensile strength (MPa) | - | 15.2 |
| Elongation at break (%) | 320 |
Embodiment 2
Material, equipment are identical with embodiment 1 with complete processing, and processing temperature is the highest is set to 260 DEG C.Crosslinked polyethylene can pass through twin screw extruder granulation, and the performance perameter of material is in table 2.
Table 2
| Performance perameter | Before depolymerization | After depolymerization |
| Gel content (%) | 100 | 31.6 |
| Melting index (g/10min190 DEG C of 2.16Kg) | Do not flow | 1.1 |
| Tensile strength (MPa) | - | 10.2 |
| Elongation at break (%) | 180 |
Embodiment 3
Material, equipment are identical with embodiment 1 with complete processing, and screw speed is set to 500rpm.Crosslinked polyethylene can pass through twin screw extruder granulation, and the performance perameter of material is in table 3.
Table 3
| Performance perameter | Before depolymerization | After depolymerization |
| Gel content (%) | 100 | 42.3 |
| Melting index (g/10min190 DEG C of 2.16Kg) | Do not flow | 0.3 |
| Tensile strength (MPa) | - | 7.6 |
| Elongation at break (%) | 110 |
Embodiment 4
Material, equipment are identical with embodiment 1 with complete processing, and screw combinations is set to 6 alternating shear power cycles.Crosslinked polyethylene can pass through twin screw extruder granulation, and the performance perameter of material is in table 4.
Table 4
| Performance perameter | Before depolymerization | After depolymerization |
| Gel content (%) | 100 | 36.8 |
| Melting index (g/10min190 DEG C of 2.16Kg) | Do not flow | 0.8 |
| Tensile strength (MPa) | - | 9.2 |
| Elongation at break (%) | 170 |
Comparative example 1
Material, equipment are identical with embodiment 1 with complete processing, and screw speed is set to 300rpm.Crosslinked polyethylene is not by twin screw extruder granulation, and the performance perameter of material is in table 5.
Table 5
| Performance perameter | Before depolymerization | After depolymerization |
| Gel content (%) | 100 | 98.9 |
| Melting index (g/10min190 DEG C of 2.16Kg) | Do not flow | Do not flow |
| Tensile strength (MPa) | - | - |
| Elongation at break (%) | - | - |
Comparative example 2
Material, equipment are identical with embodiment 1 with complete processing, and processing temperature is the highest is set to 220 DEG C.Crosslinked polyethylene is not by twin screw extruder granulation, and the performance perameter of material is in table 6.
Table 6
| Performance perameter | Before depolymerization | After depolymerization |
| Gel content (%) | 100 | 96.3 |
| Melting index (g/10min190 DEG C of 2.16Kg) | Do not flow | Do not flow |
| Tensile strength (MPa) | - | - |
| Elongation at break (%) | - | - |
Comparative example 3
Material, equipment are identical with embodiment 1 with complete processing, and screw combinations is set to 1 alternating shear power cycle.Crosslinked polyethylene is not by twin screw extruder granulation, and the performance perameter of material is in table 7.
Table 7
| Performance perameter | Before depolymerization | After depolymerization |
| Gel content (%) | 100 | 85.6 |
| Melting index (g/10min190 DEG C of 2.16Kg) | Do not flow | Do not flow |
| Tensile strength (MPa) | - | - |
| Elongation at break (%) | - | - |
Comparative example 4
Use co-rotating twin-screw forcing machine, the basic configuration of forcing machine is: screw diameter D=35mm, length-to-diameter ratio L/D=48, and power of motor is P=35KW, and screw combinations routine is arranged.Forcing machine fabrication process condition is: top temperature is 280 DEG C, and screw speed is 400rpm, die pressure 12MPa.Crosslinked polyethylene is not by twin screw extruder granulation, and the performance perameter of material is in table 8.
Table 8
| Performance perameter | Before depolymerization | After depolymerization |
| Gel content (%) | 100 | 100 |
| Melting index (g/10min190 DEG C of 2.16Kg) | Do not flow | Do not flow |
| Tensile strength (MPa) | - | - |
| Elongation at break (%) | - | - |
。
Claims (8)
1. a recovery process for crosslinked polyethylene waste, is characterized in that, step is as follows:
Crosslinked polyethylene waste after crushed, adds forcing machine, under high temperature and alternating shear effect, makes the molecular chain generation depolymerization of crosslinked polyethylene, realizes recycling;
The extrusion temperature of described forcing machine is 240 ~ 300 DEG C;
The length-to-diameter ratio of described extruder screw is 56 ~ 80, and screw speed is 400 ~ 1200rpm, the shear line speed >4m/s that material is born;
The screw combinations of described forcing machine keeps the alternating cycles of shearing force to be 2 ~ 10;
The treatment time >30s of described material;
Described forcing machine is single screw extrusion machine or twin screw extruder.
2. the recovery process of crosslinked polyethylene waste according to claim 1, is characterized in that, described forcing machine is twin screw extruder.
3. the recovery process of crosslinked polyethylene waste according to claim 2, is characterized in that, described forcing machine is parallel dual-screw extruding machine.
4. the recovery process of crosslinked polyethylene waste according to claim 1, is characterized in that, described crosslinked polyethylene waste is crushed to bulk or the flap of 2 ~ 4cm.
5. the recovery process of the crosslinked polyethylene waste according to claim 1 or 3, is characterized in that, the extrusion temperature of described forcing machine is 260 ~ 300 DEG C, and die pressure is 15 ~ 20MPa.
6. the recovery process of crosslinked polyethylene waste according to claim 5, is characterized in that, the length-to-diameter ratio of described extruder screw is 72 ~ 80, and screw speed is 500 ~ 1200rpm.
7. the recovery process of crosslinked polyethylene waste according to claim 6, is characterized in that, the screw combinations of described forcing machine keeps the alternating cycles of shearing force to be 6 ~ 10.
8. the recovery process of crosslinked polyethylene waste according to claim 7, it is characterized in that, the extrusion temperature of described forcing machine is 260 ~ 280 DEG C, die pressure is 15 ~ 20MPa, the length-to-diameter ratio of screw rod is 72 ~ 80, screw speed is 500 ~ 600rpm, and screw combinations keeps the alternating cycles of shearing force to be 6 ~ 8.
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| CN110655678A (en) * | 2019-09-29 | 2020-01-07 | 安徽滁州德威新材料有限公司 | Continuous dynamic uncrosslinking recovery method and equipment for thermosetting silane crosslinked polyolefin |
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| CN106432796A (en) * | 2016-08-08 | 2017-02-22 | 桂林市春晓环保科技有限公司 | Recovery process of waste cross-linked polyamide |
| CN106279753A (en) * | 2016-08-11 | 2017-01-04 | 桂林市春晓环保科技有限公司 | A kind of recovery process of waste and old crosslinked polypropylene |
| CN106426636A (en) * | 2016-08-11 | 2017-02-22 | 桂林市春晓环保科技有限公司 | Recovery process of waste cross-linked polyurethane |
| CN106432790A (en) * | 2016-08-11 | 2017-02-22 | 桂林市春晓环保科技有限公司 | Waste cross-linked polyvinyl chloride recovering technology |
| CN106432789A (en) * | 2016-08-11 | 2017-02-22 | 桂林市春晓环保科技有限公司 | Recycling technology of waste crosslinked poly(diallyl terephthalate) |
| CN106432798A (en) * | 2016-08-11 | 2017-02-22 | 桂林市春晓环保科技有限公司 | Recovery process of waste cross-linked polyethylene terephthalate |
| CN108638374A (en) * | 2018-04-19 | 2018-10-12 | 南京昊翔机械制造有限公司 | A kind of cross-linked poly-ethylene cable material recovery system |
| CN110655678A (en) * | 2019-09-29 | 2020-01-07 | 安徽滁州德威新材料有限公司 | Continuous dynamic uncrosslinking recovery method and equipment for thermosetting silane crosslinked polyolefin |
| CN111087646A (en) * | 2019-12-11 | 2020-05-01 | 肇庆国立新材料有限公司 | Controllable cracking process of crosslinked polyethylene |
| CN111087646B (en) * | 2019-12-11 | 2023-04-07 | 肇庆国立新材料有限公司 | Controllable cracking process of crosslinked polyethylene |
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| CN105061805B (en) | 2018-06-29 |
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