CN106633176B - Continuous recovery machine and recovery process for waste rubber - Google Patents

Continuous recovery machine and recovery process for waste rubber Download PDF

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Publication number
CN106633176B
CN106633176B CN201710060473.4A CN201710060473A CN106633176B CN 106633176 B CN106633176 B CN 106633176B CN 201710060473 A CN201710060473 A CN 201710060473A CN 106633176 B CN106633176 B CN 106633176B
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lead
recovery
double
screw
head
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CN106633176A (en
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林广义
于晓东
王权杰
王祥
井源
刘彦昌
王海
郭连彬
张建平
陈海明
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Dongying Deming Rubber Machine Intelligent Equipment Co ltd
Qingdao University of Science and Technology
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Dongying Deming Rubber Machine Intelligent Equipment Co ltd
Qingdao University of Science and Technology
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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
    • 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
    • C08J2317/00—Characterised by the use of reclaimed rubber
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
    • 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)
  • 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)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a continuous waste rubber recovery machine, which comprises a recovery machine host, a supercritical fluid preparation and injection device and a temperature control system, wherein the recovery machine host comprises a rack, a machine barrel positioned on the rack, a motor and a transmission system, a recovery machine double screw connected with the transmission system is arranged in the machine barrel, a feeding mechanism is arranged on the machine barrel, the recovery machine double screw comprises five functional regions, namely a material pressing region, a softening region, a supercritical fluid injection region, a recovery region and an extrusion region, and each functional region consists of threaded elements with different structures.

Description

Continuous recovery machine and recovery process for waste rubber
Technical Field
The invention relates to the technical field of waste rubber regeneration, in particular to a chemical reagent-free continuous rubber recovery machine and a process method for preparing reclaimed rubber by using the same.
Background
Rubber products with unique properties are widely applied in society, and because the molecular weight of the rubber products is huge and the rubber products are difficult to naturally degrade, a large number of rubber products are accumulated to cause black pollution and resource waste. China is a rubber consuming country, but is limited by climate and regions, and the domestic rubber resources are seriously insufficient, so that the realization of the recycling of the waste rubber has great significance for solving the black pollution and filling the shortage of the rubber resources. The traditional regeneration process of 'high-temperature high-pressure dynamic desulfurization' has the defects of high energy consumption, serious potential safety hazard, poor regeneration effect, discontinuous processing process and the like, so that the regeneration process is gradually replaced. The technology of replacing the tank with a machine has been developed in recent years, and the production process for recovering the waste rubber by using the screw extruder has the advantages of simple production process, environmental protection, strong continuity, good regeneration effect and the like.
In the chinese patent literature, publication No. CN104129057A, entitled decoupling plasticator for continuously regenerating waste rubber and process method, discloses a scheme (the specific contents refer to the full text of the specification), which comprises three parts of a pressing mechanism, a decoupling mechanism and a forming mechanism, wherein waste rubber is added from the pressing mechanism, and is tableted and formed in the forming mechanism after the decoupling action of the decoupling mechanism. The core of the whole equipment is an uncoupling mechanism consisting of a screw element and a driving element, wherein the screw element comprises a rotor set, a dynamic set and a static set and a bevel gear set. The scheme in the document strengthens the mechanical decoupling effect and improves the regeneration effect, but the installation of the whole machine is complex, a static disc group is designed on a machine barrel, the processing difficulty and the preparation cost of the equipment are increased, and the pollution of regenerated products is easily caused by adding chemical reagents in the production process.
In addition, in chinese patent literature, publication No. CN102977404B, which is a document named as a method for continuously preparing reclaimed rubber by using a double-stage double-screw extruder, discloses a scheme (for specific contents, refer to the full text of the specification), the pretreated waste rubber powder is firstly added into a counter-rotating double-screw extruder, and then enters a co-rotating double-screw extruder to be subjected to shearing extrusion again after being extruded, so that the prepared reclaimed rubber has good performance, but the whole operation process is complex, the production line is long, and energy waste is caused by repeated heating and cooling operations.
The supercritical fluid technology is a new chemical technology developed in nearly 30 years, has the advantages of excellent dissolving capacity, mass transfer capacity, low viscosity, high diffusivity and the like, can rapidly swell the waste rubber under certain conditions, and provides possibility for the recovery of the waste rubber.
In Chinese patent literature, publication No. CN204454972U and document entitled as a waste rubber powder desulfurization regeneration device disclose a scheme (the specific content refers to the full specification), waste rubber materials are subjected to desulfurization reaction under the action of microwaves and then enter a first extruder, a supercritical fluid conveying device is connected with the first extruder, a regeneration reagent is promoted to be uniformly dispersed into the waste rubber powder by a supercritical fluid, and the rubber materials are further regenerated; the second extruder is used to shape the reclaimed rubber compound. In the whole production process, the rubber material is subjected to desulfurization for ten minutes, so that the main chain is easily broken; and the production line comprises an electromagnetic heating device, two extruders and a supercritical fluid conveying device, so that the equipment is various, the production line is long, and one-time investment is huge.
In chinese patent publication No. CN202357411U, entitled supercritical fluid auxiliary processing complete equipment, an auxiliary equipment for processing thermoplastic resin is disclosed, which is mainly used for supercritical fluid to replace plasticizer, reducing the processing difficulty of thermoplastic resin. The application range is narrow, and the sufficient shearing force cannot be provided for the recovery of the waste rubber.
In view of the above, the existing production equipment and production process cannot meet the requirement of waste rubber recycling, and therefore, a new production equipment and process is urgently needed to replace the existing equipment and process.
Disclosure of Invention
In order to solve the technical problems, the invention provides a continuous waste rubber recovery machine and a recovery process, so as to achieve the purposes of no addition of any chemical reagent in the recovery process, low production energy consumption, good waste rubber recovery quality, simple equipment structure, less operation procedures and low industrial investment.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a continuous waste rubber recovery machine comprises a recovery machine host, a supercritical fluid preparation and injection device and a temperature control system, wherein the recovery machine host comprises a rack, a machine barrel positioned on the rack, a motor and a transmission system, a recovery machine double screw connected with the transmission system is arranged in the machine barrel, a feeding mechanism is arranged on the machine barrel, and the recovery machine double screw comprises a material pressing area, a softening area, a supercritical fluid injection area, a recovery area and an extrusion area; the material pressing area comprises a first single-head variable-lead threaded element; the softening area comprises a first meshing block, a second meshing block and a single-head thread conveying element positioned between the first meshing block and the second meshing block; the supercritical fluid injection region comprises a pressure reduction element which is a single-head thread element; the recovery area comprises a single-head variable-lead screw element II, an engagement block III, a double-head reverse screw element I, a double-head screw conveying element I, an engagement block IV, a double-head reverse screw element II, a double-head screw conveying element II, a large-lead screw element and a double-head screw conveying element III which are sequentially connected according to the movement direction of sizing materials; the extrusion zone comprises a homogenizing element and a double-start variable-lead threaded element, wherein the homogenizing element is a double-start threaded element with a notch on a screw edge.
In the scheme, the lead of the first single-head variable-lead thread element and the lead of the second single-head variable-lead thread element are gradually reduced along the movement direction of the rubber material; the maximum lead size of the first single-head variable-lead thread element is the same as the external diameter of the thread edge, and the minimum lead size is two thirds of the maximum lead size; the maximum lead of the second single-head variable-lead threaded element does not exceed the outer diameter of the screw ridge, and the minimum lead of the second single-head variable-lead threaded element is not lower than two thirds of the outer diameter of the screw ridge.
In the scheme, the first meshing block and the second meshing block are formed by splicing 7 two-end meshing blocks with the thickness of 8mm according to the staggered angle of 30 degrees, and the third meshing block and the fourth meshing block are formed by splicing six two-end meshing blocks with the thickness of 8mm according to the staggered angle of 30 degrees.
In the above scheme, the lead of the single-start thread element in the supercritical fluid injection region is the same as the external diameter of the screw ridge.
In the scheme, the maximum lead of the double-head variable-lead threaded element in the extrusion area is three-quarters of the external diameter of the thread edge, and the minimum lead is 10mm less than the maximum lead.
In a further scheme, the opening direction of the notch is perpendicular to the screw edge, and the volume of the notch in the flowing direction of the sizing material is gradually reduced.
In a further technical scheme, the twin screws of the recovery machine are co-rotating twin screws, and the co-rotating shear rate of the twin screws is higher.
A recovery process of a waste rubber continuous recovery machine comprises the following process steps:
(1) The waste sizing material entering the main machine of the recovery machine is conveyed forwards under the friction drag action of the double screws of the recovery machine, and the sizing material becomes dense due to the gradual reduction of the lead of the material pressing area, so that enough back pressure is provided for the movement of the sizing material to convey forwards;
(2) The rubber material entering the softening zone firstly passes through the shearing and stretching action of the meshing block I, is conveyed into the meshing block II through the single-end thread conveying element after being primarily softened, and is further softened;
(3) The softened rubber material contacts with the supercritical fluid in a large space provided by a pressure reduction element in the supercritical fluid injection region, and is fully swelled;
(4) The swollen rubber material is subjected to shearing, tearing and stretching in the meshing block III after entering the restoration area, and the retention time of the rubber material is prolonged under the action of the double-head reverse thread conveying element I, so that the effect of primary restoration is achieved; the primarily recovered rubber material passes through the first double-thread conveying element and enters the fourth meshing block and the second double-thread reverse thread element again for supplementary shearing, tearing and stretching, the second double-thread conveying element conveys the supplemented and recovered rubber material to the large-lead thread element for final recovery reaction, and the completely recovered rubber material enters the extrusion area through the third double-thread conveying element;
(5) In the homogenizing element in the extruding area, irregular flow formed by the notch is fully mixed and extruded from the main machine of the recovery machine through the double-thread element to complete the whole recovery reaction.
In the scheme, the mass ratio of the supercritical fluid to the waste rubber is 0.005-0.02, the rotating speed of a twin-screw of the recovery machine is 40-80 r/min, the temperature of a double-screw pressing zone of the recovery machine is controlled at 50-80 ℃, the temperature of a softening zone is controlled at 90-110 ℃, the temperature of a supercritical fluid injection zone and a recovery zone are controlled at 120-150 ℃, and the temperature of an extrusion zone is controlled at 60-80 ℃.
Through the technical scheme, the continuous waste rubber recovery machine and the recovery process provided by the invention utilize the controllable stretching and shearing synergistic effect provided by the recovery machine to selectively break C-S and S-S cross-linked bonds in the waste rubber under the supercritical environment, so that the recovery of the waste rubber is realized. The scheme has the advantages that no chemical reagent is added in the recovery process, the production energy consumption is low, the recovery quality of the waste rubber is good, the equipment structure is simple, the operation procedures are few, and the industrial investment is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below.
FIG. 1 is a schematic structural view of a continuous rubber scrap recovery machine according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a main machine of a recovery machine according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a twin screw of the recovery machine disclosed in the embodiment of the invention;
FIG. 4 is a schematic structural view of a softening zone disclosed in an embodiment of the present invention;
FIG. 5 is a schematic illustration of a recovery zone according to an embodiment of the present invention;
FIG. 6 is a schematic view of the circumferential development of the homogenizing element disclosed in the embodiments of the present invention.
In the figure, I, a material pressing area; II, softening area; III, a supercritical fluid injection area; IV, a recovery area; v, an extrusion zone; 1. restoring the host machine; 2. a supercritical fluid preparation and injection device; 3. a temperature control system; 4. a frame; 5. a barrel; 6. a motor; 7. a transmission system; 8. a restoring machine double screw; 9. a feeding mechanism; 10. a single-head variable-lead screw element I; 11. a first meshing block; 12. a second meshing block; 13. a single-start threaded conveying element; 14. a voltage dropping element; 15. a single-head variable-lead screw element II; 16. a third meshing block; 17. a first double-start reverse thread element; 18. a first double-thread conveying element; 19. the meshing block IV; 20. a second double-ended reverse thread element; 21. a second double-thread conveying element; 22. a high lead threaded element; 23. a third double-thread conveying element; 24. a homogenizing element; 25. a double-start variable-lead threaded element; 26. a notch.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a continuous waste rubber recovery machine and a recovery process, and the specific embodiment is as follows:
as shown in fig. 1, a continuous rubber scrap recovery machine comprises a recovery machine main body 1, a supercritical fluid preparation and injection device 2, and a temperature control system 3. As shown in fig. 2, the main machine 1 of the recovery machine comprises a frame 4, a machine barrel 5 positioned on the frame 4, a motor 6 and a transmission system 7, wherein a double screw 8 of the recovery machine which rotates in the same direction and is connected with the transmission system 7 is arranged in the machine barrel 5, and a feeding mechanism 9 is arranged on the machine barrel 5; the machine barrel 5 and the double screws 8 of the recovery machine jointly form an extrusion system to finish solid conveying, softening, recovery and extrusion of the sizing material.
As shown in fig. 3, the twin-screw 8 of the recovery machine includes five functional areas, namely a material pressing area for realizing continuous feeding, a softening area for softening and building pressure of rubber material, a supercritical fluid injection area for providing enough space for the supercritical fluid to fully contact with the waste rubber, a recovery area for fully recovering under the shearing and stretching synergistic action of the twin-screw of the recovery machine in a supercritical environment, and an extrusion area for uniformly and stably extruding the recovery rubber.
The material pressing area I comprises a pair of first single-head variable-lead thread elements 10, and the first single-head variable-lead thread elements 10 are structurally characterized in that the lead of the thread section is gradually reduced under the condition that the depth of the thread groove is unchanged, so that the volume of the thread groove is reduced. The maximum lead size of the single-head variable-lead threaded element I10 is the same as the external diameter of the screw ridge, and the minimum lead size is two thirds of the maximum lead size. The waste rubber material entering the main machine 1 of the recovery machine is conveyed forwards under the friction drag action of the double screw 8 of the recovery machine, and the volume of the screw grooves becomes smaller and is continuously compacted, so that sufficient back pressure is provided for the movement of the rubber material; two screw rods which are matched with each other are partially meshed, longitudinal opening and transverse closing cannot be achieved theoretically, but the movement capacity of the sizing material in the transverse direction is reduced by adjusting the screw edge structure, and the good conveying capacity of the double screw rods of the recovery machine on the sizing material is guaranteed.
As shown in FIG. 4, the softening zone II comprises a first engaging block 11, a second engaging block 12 and a single-head screw conveying element 13 positioned between the first engaging block 11 and the second engaging block 12, wherein the first engaging block 11 and the second engaging block 12 are formed by splicing 7 two-head engaging blocks with the thickness of 8mm according to a staggered angle of 30 degrees. The vulcanized rubber has high hardness and is difficult to deform, heat required by softening is provided by heat transfer of a machine barrel and plastic dissipation generated by shearing of rubber materials, and the thickness and the number of the meshing blocks are increased, so that the shearing of the rubber materials is improved, and the softening efficiency is improved. The meshing block is a pressure consumption element, the meshing block is matched with a single-head thread conveying element for use, pressure is built in the flowing process of the sizing material on the premise that the shearing action advantage of the meshing block is exerted, and the good conveying capacity of the double screws of the recovery machine to the sizing material is guaranteed. When the rubber material flows through the gaps between the meshing blocks, the rubber material is subjected to the shearing action between the screw ridges of the meshing blocks, the softening of the rubber material is accelerated due to heat generated by viscous dissipation, the lead of the single-head thread conveying element is consistent with the minimum lead of the single-head variable-lead thread element I, the conveying capacity of the double screws is ensured, and the serious degradation of a molecular chain caused by excessive local shearing is avoided.
The supercritical fluid injection region III comprises a pressure reduction element 14, wherein the pressure reduction element 14 is a single-head threaded element, and the lead of the single-head threaded element is the same as the external diameter of the screw ridge in size. Compared with other threaded elements, the lead is increased, so that the screw groove has larger screw groove volume, the coiled molecular chain in the previously compacted rubber material has enough space to stretch, the loosening of the rubber material is realized, the contact area of the loosened rubber material and the supercritical fluid is increased, the diffusion capacity of the supercritical fluid in the rubber material is favorably improved, and the swelling effect of the waste rubber is ensured.
As shown in fig. 5, the recovery zone iv includes a second single-start variable-lead screw member 15, a third engagement block 16, a first double-start reverse screw member 17, a first double-start screw conveying member 18, a fourth engagement block 19, a second double-start reverse screw member 20, a second double-start screw conveying member 21, a large-lead screw member 22, and a third double-start screw conveying member 23, which are connected in this order in the direction of movement of the rubber compound. The lead of the second single-head variable-lead threaded element 15 gradually decreases along the moving direction of the rubber material, the maximum lead of the second single-head variable-lead threaded element 15 does not exceed the outer diameter of the screw ridge, and the minimum lead of the second single-head variable-lead threaded element 15 is not lower than two thirds of the outer diameter of the screw ridge. The third engaging block 16 and the fourth engaging block 19 are composed of six two-head engaging blocks with the thickness of 8mm, and the number of the heads of the engaging blocks is reduced to locally reduce the dispersing and mixing action of the swelled rubber material and avoid sharp reduction of the molecular weight of the rubber material caused by locally excessive shearing force. The staggered angle of the two-end meshing blocks in the area is 30 degrees, the double-end meshing block has good axial conveying capacity and shearing action, the gap between the meshing block and the meshing block is 2mm, the gap between the meshing block and the inner wall of the machine barrel is 0.5mm, the disc top of one meshing block and the disc bottom of the other meshing block in the meshing area between the meshing blocks form a closed area with changeable volume, and the rubber materials in the closed area are subjected to constantly-changed shearing tearing and stretching action, so that the primary recovery of the waste rubber materials is realized. Directly connected with the meshing block is a reverse thread element which plays a role in prolonging the retention time of the sizing material in the interior of the recovery machine. The fourth engaging block 19 and the second double-head reverse thread element 20 play a role of complementary restoration; the structural design of the large-lead screw elements 22 is inspired by the meshing rotor of an internal mixer, the screw edge of one large-lead screw element and the screw groove of the other large-lead screw element form a variable volume area, and the rubber in the area is repeatedly extruded and torn to enable the waste rubber to complete the final recovery reaction.
The function of the extrusion zone v is to extrude the reconstituted gum material uniformly and continuously, comprising a homogenizing element 24 and a double-start variable-pitch threaded element 25, the homogenizing element 24 being a double-start threaded element with a notch 26 in the screw edge. Referring to fig. 6, the opening direction of the notch 26 is perpendicular to the spiral edge, and the volume of the notch 26 in the flow direction of the sizing material is gradually reduced. The design of the notch 26 strengthens the backflow effect of the sizing material, is beneficial to uniformly mixing the recovered sizing material, and the notch 26 with the gradually reduced volume enables the recovered sizing material to have volume change when flowing through, so as to play a role in supplementing recovery; furthermore, the stretching of the compound as it flows through the slots 26 of varying volume has the effect of breaking up the few crosslinked networks that have not yet fully recovered. The maximum lead of the double-head variable-lead threaded element 25 is three quarters of the external diameter of a screw edge, the minimum lead is 10mm less than the maximum lead, the lead change is favorable for establishing axial pressure, and the rubber material is stably extruded.
A recovery process of a waste rubber continuous recovery machine comprises the following process steps:
adding waste rubber powder into a feeding mechanism, starting a continuous recovery machine main machine 1, feeding rubber materials into a machine barrel 4 under the action of self gravity and the feeding mechanism, conveying the rubber materials forwards under the action of friction drag of a double screw 8 of a recovery machine, and starting a supercritical fluid preparation and injection device 2 when the rubber materials are continuously and uniformly extruded. The mass ratio of the supercritical fluid to the waste rubber is 0.005-0.02, the rotating speed of a double screw 8 of the recovery machine is 40-80 r/min, the temperature of a material pressing zone I is controlled at 50-80 ℃, the temperature of a softening zone II is controlled at about 90-110 ℃, the temperature of a supercritical fluid injection zone III and a recovery zone IV is controlled at about 120-150 ℃, and the temperature of an extrusion zone V is controlled at 60-80 ℃.
The waste rubber material entering the main machine 1 of the recovery machine completes the whole recovery process according to the following processes:
(1) The waste rubber material entering the main machine 1 of the recovery machine is conveyed forwards under the friction dragging action of the double screw 8 of the recovery machine, and the rubber material is compacted due to the fact that the lead of the material pressing area I is gradually reduced, so that enough back pressure is provided for the movement of the rubber material to convey forwards;
(2) The rubber material entering the softening zone II is firstly subjected to the shearing and stretching action of the meshing block I11, is primarily softened and then enters the meshing block II 12 through the conveying of the single-end thread conveying element 13, so that further softening is realized;
(3) The softened rubber material is contacted with the supercritical fluid in a large space provided by a pressure reduction element 14 in the supercritical fluid injection region III, and is fully swelled;
(4) The swollen rubber material enters a recovery area IV, the swollen rubber material is subjected to shearing tearing and stretching in an engagement block III 16, and the retention time of the rubber material is prolonged under the action of a double-head reverse thread element I17, so that the effect of primary recovery is achieved; the primarily recovered rubber material passes through the first double-thread conveying element 18 and then enters the fourth meshing block 19 and the second double-thread reverse-thread element 20 again to be subjected to supplementary shearing, tearing and stretching, the second double-thread conveying element 21 conveys the rubber material subjected to supplementary recovery to the large-lead thread element 22 to be subjected to final recovery reaction, and the completely recovered rubber material enters an extrusion zone through the third double-thread conveying element 23;
(5) In the homogenizing element 24 in the extrusion zone, the irregular flow formed by the notches 26 is mixed well, and then extruded from the main machine 1 of the recovery machine through the double-start variable-lead screw element 25, and the whole recovery reaction is completed.
And extruding, refining and molding the recovered rubber material, and finally storing in a warehouse.
The first embodiment is as follows:
reaction conditions are as follows: the mass ratio of the supercritical fluid to the waste rubber is 1.
The performance of the recovery rubber is determined by experiments: ash =7.0%, acetone extract =17.0%, mooney viscosity ML100 ℃ (1 +4 min) =45; and vulcanizing according to a GB/T13460-2008 re-vulcanization formula to obtain the vulcanized rubber with the following mechanical properties of tensile strength =15.3MPa and elongation at break =474.47%.
The second embodiment is as follows:
the reaction conditions are as follows: the mass ratio of the supercritical fluid to the waste rubber is 2.
The performance of the recovery rubber is determined by experiments: ash =6.5%, acetone extract =16.2%, mooney viscosity ML100 ℃ (1 +4 min) =40; and vulcanizing according to a GB/T13460-2008 re-vulcanization formula to obtain the vulcanized rubber with the following mechanical properties of tensile strength =14.9MPa and elongation at break =500.07%.
The third concrete example:
the reaction conditions are as follows: the mass ratio of the supercritical fluid to the waste rubber is 1.
The performance of the recovery rubber is determined by experiments: ash =7.2%, acetone extract =17.4%, mooney viscosity ML100 ℃ (1 +4 min) =48; and vulcanizing according to a GB/T13460-2008 re-vulcanization formula to obtain the vulcanized rubber with the following mechanical properties of tensile strength =15.7MPa and elongation at break =468.98%.
Description of the invention: the national superfine Al standard comprises that ash content is less than or equal to 10 percent, acetone extract is less than or equal to 18 percent, mooney viscosity ML100 ℃ (1 +4 min) is less than or equal to 95 percent, tensile strength is more than or equal to 14.0MPa, and elongation at break is more than or equal to 420 percent.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (2)

1. A recovery process of a waste rubber continuous recovery machine is characterized in that the waste rubber continuous recovery machine comprises a recovery machine host, a supercritical fluid preparation and injection device and a temperature control system, wherein the recovery machine host comprises a rack, a machine barrel positioned on the rack, a motor and a transmission system, a recovery machine double screw connected with the transmission system is arranged in the machine barrel, and a feeding mechanism is arranged on the machine barrel; the material pressing area comprises a first single-head variable-lead threaded element; the softening area comprises a first meshing block, a second meshing block and a single-head thread conveying element positioned between the first meshing block and the second meshing block; the supercritical fluid injection region comprises a pressure reduction element which is a single-head thread element; the recovery area comprises a single-head variable-lead screw element II, an engagement block III, a double-head reverse screw element I, a double-head screw conveying element I, an engagement block IV, a double-head reverse screw element II, a double-head screw conveying element II, a large-lead screw element and a double-head screw conveying element III which are sequentially connected according to the movement direction of sizing materials; the extrusion zone comprises a homogenizing element and a double-start variable-lead threaded element, wherein the homogenizing element is a double-start threaded element with a notch on a screw edge;
the lead of the first single-head variable-lead threaded element and the lead of the second single-head variable-lead threaded element are gradually reduced along the movement direction of the rubber material; the maximum lead size of the first single-head variable-lead thread element is the same as the external diameter of the thread edge, and the minimum lead size is two thirds of the maximum lead size; the maximum lead of the second single-head variable-lead threaded element does not exceed the outer diameter of the screw ridge, and the minimum lead is not lower than two thirds of the outer diameter of the screw ridge;
the first meshing block and the second meshing block are formed by splicing 7 two-end meshing blocks with the thickness of 8mm according to a staggered angle of 30 degrees, and the third meshing block and the fourth meshing block are formed by splicing six two-end meshing blocks with the thickness of 8mm according to a staggered angle of 30 degrees;
the lead of the single-head thread element in the supercritical fluid injection region is the same as the external diameter of the screw edge;
the maximum lead of the double-head variable-lead threaded element in the extrusion area is three quarters of the external diameter of the thread edge, and the minimum lead is 10mm less than the maximum lead; the opening direction of the notch is perpendicular to the spiral edge, and the volume of the notch in the flowing direction of the sizing material is gradually reduced;
the recovery process comprises the following process steps:
(1) The waste sizing material entering the main machine of the recovery machine is conveyed forwards under the friction drag action of the double screws of the recovery machine, and the sizing material becomes dense due to the gradual reduction of the lead of the material pressing area, so that enough back pressure is provided for the movement of the sizing material to convey forwards;
(2) The rubber material entering the softening zone firstly passes through the shearing and stretching action of the meshing block I, is conveyed into the meshing block II through the single-end thread conveying element after being primarily softened, and is further softened;
(3) The softened rubber material contacts with the supercritical fluid in a large space provided by a pressure reduction element in the supercritical fluid injection region, and is fully swelled;
(4) The swollen rubber material enters a recovery area, is subjected to shearing tearing and stretching action in the meshing block III, and the retention time of the rubber material is prolonged under the action of the double-head reverse thread element I, so that the effect of primary recovery is achieved; the primarily recovered rubber material passes through the first double-thread conveying element and enters the fourth meshing block and the second double-thread reverse thread element again for supplementary shearing, tearing and stretching, the second double-thread conveying element conveys the supplemented and recovered rubber material to the large-lead thread element for final recovery reaction, and the completely recovered rubber material enters the extrusion area through the third double-thread conveying element;
(5) In the homogenizing element in the extrusion area, after the irregular flow formed by the notch is fully mixed, the mixture is extruded from a main machine of a recovery machine through a double-head variable-lead screw element, and the whole recovery reaction is finished;
the mass ratio of the supercritical fluid to the waste rubber is 0.005-0.02, the rotating speed of the twin-screw of the recovery machine is 40-80 r/min, the temperature of the twin-screw pressing zone of the recovery machine is controlled at 50-80 ℃, the temperature of the softening zone is controlled at 90-110 ℃, the temperature of the supercritical fluid injection zone and the recovery zone is controlled at 120-150 ℃, and the temperature of the extrusion zone is controlled at 60-80 ℃.
2. The process of claim 1, wherein the twin screws of the rubber scrap recoverer are co-rotating twin screws.
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