CN102250381B - Twin-screw device and method for rubber desulfurization - Google Patents
Twin-screw device and method for rubber desulfurization Download PDFInfo
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- CN102250381B CN102250381B CN2011102063514A CN201110206351A CN102250381B CN 102250381 B CN102250381 B CN 102250381B CN 2011102063514 A CN2011102063514 A CN 2011102063514A CN 201110206351 A CN201110206351 A CN 201110206351A CN 102250381 B CN102250381 B CN 102250381B
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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 relates to a twin-screw rubber desulfurization device, which comprises a drum body, intermeshing co-rotating twin screws located in the drum body and a heating device, wherein the drum body is provided with a feeding port; and the twin screws comprise a feeding convey section with a compression ratio, two or more incontinuous extrusion shearing sections as well as a screw transitionsection and a mixing section between two adjacent extrusion shearing sections. By the twin-screw device and the method provided by the invention, the technical problems that the existing rubber desulfurization technology has severe pollution, high equipment requirement and large energy consumption can be solved.
Description
Technical field
The present invention relates to the recycling field of waste rubber, be specifically related to device and processing method that the waste rubber desulfurization prepares reclaimed rubber.
Background technology
Global consumption of rubber was 2,370 ten thousand tons in 2010, consumed first big country and China is world's rubber.According to Beijing Zhongshang Circulation Production Ability Promoting Center statistics, China's year consumption of rubber reaches 7,100,000 tons, accounts for 30% of global total amount consumed, and 70% natural rubber, 40% synthetic rubber need import.Regenerated rubber can replace rubber on the one hand, has alleviated the serious scarcity of natural rubber; Make waste old realize recycling on the other hand, solved the waste old problem of environment pollution caused.
The recycling of China's waste rubber mainly adopts the chemsweet process technology to produce reclaimed rubber, account for and reclaim more than 90% of waste rubber, because this chemsweet process is the overlap span formula, to use a large amount of chemical assistants in process of production, can produce serious secondary pollution, production environment is relatively poor, and the reclaimed rubber of producing is fair, can only be used for the production of low and middle-grade rubber items.On December 31st, 2010, industrial information portion has issued " junked tire comprehensive utilization instruction ", improve industrial concentration and environmental protection of enterprise and purify equipment, progressively eliminate the energy consumption height, pollute heavy " little regenerated rubber " enterprise and the dynamic digester chemical desulfurization of regenerated rubber production technique, thereby established the development trend of rubber green desulfurization Technology from national aspect.
The main technique technology of present domestic research and development waste old green desulfurization is as follows:
Lian Yongxiang etc. have reported the De-link reclaiming process research of pells in " the De.link reclaiming process research of pells " (2000 the 14th the 1st phases of volume of Shenyang Institute of Chemical Technology journal), method is that waste rubber obtains 10～40 order rubber powders after crushed, then at normal temperature, under the normal pressure rubber powder joined the (mill of the compounding rubber of certain mechanical shearing effect equipment can be provided, Banbury mixer, milling machine) in, preferably join in refiner or the fine crusher, mechanical shearing 1min, roller surface is heated up, add the De-link regenerator then, shear mixing, after shearing mixing certain hour, add a small amount of broken-(down)rubber and processing aid (tackifying resin etc.), can obtain having higher-strength and adhering regeneration film.This method is the chemical method desulfurization, and secondary pollution is arranged.
Utility model patent CN201610419 disclose " preparation of a kind of waste vulcanized butyl rubber desulfurization regeneration with novel mechanical ", be intended to solve that existing waste vulcanized butyl rubber desulfurization regeneration is low with mechanical separator speed, the long problem of the low desulfurization fusion time of pressure.It is screw extrusion press and the milling machine that adopts, and screw extrusion press is the forcing machine of twin screw or three screw rods, the hopper of the discharge port butt joint screw extrusion press of milling machine.The equipment of this method is simple, prepares butyl renewable rubber but be only applicable to desulfurization.
People such as Zhang Liqun have applied for patent " a kind of method of desulphurization, disaggregation and regeneration of vulcanized rubber ", publication number CN101503525, at first obtain supercritical co by the method that in autoclave, adds dry ice safe and efficiently, utilize the supercritical CO 2 fluid to realize the quick free of contamination infiltration in the rubber of desulfurization reagent, utilize mechanical shearing, temperature and desulfurization reagent three synergy to interrupt the cross-link bond of rubber then, thereby realize the desulfurization regeneration of rubber.The supercritical CO 2 technology that this method is used is to the equipment requirements height.
CN 201040408 discloses a kind of device of devulcanization of rubber, and this device comprises pulverizer, sifting machine, magnetic separator, feeding machine, microwave oven, forcing machine, filtration unit and packing apparatus.This technology is carried out microwave desulfurization through microwave oven after waste old is passed through pulverizing, screening, magnetic separation again, directly enters the forcing machine spout by the microwave oven discharge port after the desulfurization, plastifies, lowers the temperature, filters by forcing machine, finishes whole process of production at last.The device category that this method is used is many, and power consumption is big.
CN2059872 discloses a kind of devulcanization of rubber forcing machine, and its extrusion screw is the screw rod that a kind of two start screw and major and minor threaded segments arrange, and employing is connected the head of truncated cone-shaped core with bearing with screw rod.This machine of utilization carries out desulfurization regeneration to waste old, and its quality reaches more than the reclaimed rubber national standard secondary.This method sweetening effectiveness is general, and the reclaimed rubber performance is general.
Summary of the invention
The technical problem to be solved in the present invention is to solve the existing technical problem that the devulcanization of rubber technology is seriously polluted, equipment requirements is high, energy consumption is big.The invention provides a kind of discontinuous extrusion shearing twin screw devulcanization of rubber technology, method is pollution-free, equipment is simple, energy consumption is little for this reason.
The invention provides a kind of twin screw devulcanization of rubber device, have cylindrical shell, be positioned at cylindrical shell in the same way the engagement twin screw and heating unit, cylindrical shell has opening for feed, and described twin screw comprises reinforced transportation section, two or more the mutual discontinuous extrusion shearing sections with compression ratio and is positioned at intersegmental screw rod transition section, the mixing section of adjacent two extrusion shearings.
Further: described extrusion shearing section is two combined shear pieces that are meshed, and the combined shear piece is made up of two or more cams that are staggeredly located out, the angle difference that staggers of its adjacent cams of combined shear piece of different extrusion shearing sections.Strong extrusion shearing be can realize between the combined shear piece that is meshed, pulverizing and the desulfurization of rubber grain are conducive to.The angle difference that staggers of its adjacent cams of combined shear piece of different extrusion shearing sections can realize complete desulfurization or the partial desulfurization of rubber powder generating the mixed type reclaimed rubber that complete desulfurization and partial desulfurization coexist.
Described screw rod transition section is 2～4, and every section is 3～5 pitch.Transition section mainly plays forced conveyance and self-cleaning function, and too much transition section can cause screw slenderness ratio excessive, increases energy consumption.
The compression ratio of described reinforced transportation section is 2: 1～4: 1.Compression ratio refers to the ratio of first segment screw thread volume and final section screw thread volume, by pitch and the depth controlled screw thread volume processed of control screw thread.Rubber powder particle diameter difference hour is selected small reduction ratio, when the particle diameter difference is big, selects bigger compression ratio.By the volume of control feeding section into and out of waste rubber grain, make and dwindle the distance between the waste rubber grain by the enough pressure of waste rubber generation that enters the extrusion shearing zone from feeding section, further improve and shear and desulfuration efficiency.Because the tap density of rubber powder is little more a lot of than rubber density, tap density is relevant with the granularity of rubber powder, and compression ratio is too small, and then the extrusion shearing function is poor, and excessive then extrusion shearing power consumption is excessive, causes the equipment excess load to damage screw rod.
The length-to-diameter ratio L/D of described twin screw is 50: 1～65: 1.The more big material of length-to-diameter ratio residence time in equipment is more long, more is conducive to rubber and shears desulfurization.The too small devulcanization of rubber weak effect that causes, excessive energy consumption and the cost then equipped increases.
The material of cylindrical shell and twin screw is highly wear-resisting alloy steel.Highly wear-resisting alloy steel can prevent component abrasion in continuous shear extrusion process and influence the shearing sweetening effectiveness.
Adopt foregoing twin screw devulcanization of rubber device to carry out the method for devulcanization of rubber, has following processing step: be the opening for feed of the vulcanized rubber powder adding twin screw of 0.2-1.0mm with particle diameter, carry out appropriate compacting through the reinforced transportation section with compression ratio, be delivered to the extrusion shearing section of twin screw, pass through discontinuous each extrusion shearing section successively, under heating condition under the extrusion shearing of dissimilar combined shear pieces, realize the desulfurization wholly or in part of rubber powder, generate the mixed type reclaimed rubber of complete desulfurization and partial desulfurization coexistence.
Vulcanized rubber powder raw material that the present invention is suitable for can be the desulfurization of vulcanized rubbers such as scrap tire rubber, isoprene-isobutylene rubber, styrene-butadiene rubber(SBR), terpolymer EP rubber, ethylene-propylene rubber(EPR).The invention has the beneficial effects as follows: the technological process of using twin screw devulcanization of rubber device of the present invention is the shearing sulfur removal technology under continuous, airtight, the rubber powder flow state, so can not cause secondary pollution to environment, and equipment is simple, shearing, desulfuration efficiency height, and energy consumption is little.
Description of drawings
The twin screw devulcanization of rubber device synoptic diagram of Fig. 1 first embodiment of the present invention
The twin screw devulcanization of rubber device synoptic diagram of Fig. 2 second embodiment of the present invention
The reinforced transportation section of among Fig. 1, Fig. 21 expression, 2 expression extrusion shearing sections, 3 expression transition sections, 4 expression mixing sections
The devulcanization of rubber process synoptic diagram of first embodiment of Fig. 3 twin screw devulcanization of rubber of the present invention device
The devulcanization of rubber process synoptic diagram of second embodiment of Fig. 4 twin screw devulcanization of rubber of the present invention device
The structural representation of the reinforced transportation section of the twin screw among Fig. 5 the present invention,
Wherein scheming A is the first segment screw thread that pitch is big, the degree of depth is dark, volume is bigger; Figure B is the final section screw thread that pitch is less, the degree of depth is more shallow, volume is less
Fig. 6 is that the adjacent cams angle that staggers is the structural representation of the combined shear piece formed of 90 °, 5 cams
Fig. 7 is that the adjacent cams angle that staggers is the structural representation of the combined shear piece formed of 45 °, 7 cams
Fig. 8 is that the adjacent cams angle that staggers is the structural representation of the combined shear piece formed of 30 °, 7 cams
Fig. 9 is twin screw devulcanization of rubber schematic representation of apparatus, 5 expression cylindrical shells among the figure, 6 expression twin screws, 7 expression opening for feeds, 8 expression heating units.
Embodiment
Embodiment 1
First embodiment of twin screw devulcanization of rubber device of the present invention as shown in Figure 1, has cylindrical shell, be positioned at twin screw and the heating unit of engagement in the same way of cylindrical shell, cylindrical shell has opening for feed, described twin screw comprises the reinforced transportation section with compression ratio, three mutual discontinuous extrusion shearing sections, lay respectively at the intersegmental two stage screw transition section of adjacent two extrusion shearings, mixing section, the extrusion shearing section is two combined shear pieces that are meshed, the combined shear piece is made up of two or more cams that are staggeredly located out, the angle difference that staggers of its adjacent cams of combined shear piece of different extrusion shearing sections, wherein as shown in Figure 4 in the first combined shear piece adjacent cams angle that staggers be 90 °, the adjacent cams angle that staggers is 45 ° in the second combined shear piece as shown in Figure 5, and the adjacent cams angle that staggers is 30 ° in the 3rd combined shear piece as shown in Figure 6; The screw rod transition section is 3 pitch for every section; The compression ratio of reinforced transportation section is 2: 1; The length-to-diameter ratio L/D of twin screw is 55: 1; The cylindrical shell that contacts with waste rubber grain and twin screw material are highly wear-resisting alloy steel.
As shown in Figure 3, adopt this twin screw devulcanization of rubber device to carry out the method for devulcanization of rubber, has following processing step: be the opening for feed of the vulcanized rubber powder adding cylindrical shell of 0.2-1.0mm with particle diameter, carry out appropriate compacting through the reinforced transportation section with compression ratio, be delivered to the extrusion shearing section of twin screw, pass through discontinuous three extrusion shearing sections successively, under heating condition under the extrusion shearing of dissimilar combined shear pieces, realize the desulfurization wholly or in part of rubber powder, generate the mixed type reclaimed rubber of complete desulfurization and partial desulfurization coexistence.
In the complete processing screw speed is controlled at 100rpm.GB13460-2003, tensile property and elongation at break testing standard are pressed in the mixing and sample preparation of reclaimed rubber: GB/T 1040-92, the testing standard of mooney viscosity: GB/T 1232.1-2000.After shearing desulphurization reaction, reclaimed rubber has obtained splendid revulcanization effect, tensile strength 14.9MPa, elongation at break 478.5%, mooney viscosity 60.
Second embodiment of twin screw devulcanization of rubber device of the present invention as shown in Figure 2, has cylindrical shell, be positioned at twin screw and the heating unit of engagement in the same way of cylindrical shell, cylindrical shell has opening for feed, described twin screw comprises the reinforced transportation section with compression ratio, five mutual discontinuous extrusion shearing sections and lay respectively at the intersegmental four zone screw transition section of adjacent two extrusion shearings, mixing section, the extrusion shearing section is two combined shear pieces that are meshed, the combined shear piece is made up of two or more cams that are staggeredly located out, the angle difference that staggers of its adjacent cams of combined shear piece of different extrusion shearing sections, wherein the adjacent cams angle that staggers is 90 ° in the first combined shear piece, the adjacent cams angle that staggers is 60 ° in the second combined shear piece, and the adjacent cams angle that staggers is that the adjacent cams angle that staggers is that the adjacent cams angle that staggers is 15 ° in 30 ° of the 5th combined shear piece in 45 ° of the 4th combined shear piece in the 3rd combined shear piece; The screw rod transition section is 3 pitch for every section; The compression ratio of reinforced transportation section is 4: 1; The length-to-diameter ratio L/D of twin screw is 65: 1; The cylindrical shell that contacts with waste rubber grain and twin screw material are highly wear-resisting alloy steel.
As shown in Figure 4, adopt this twin screw devulcanization of rubber device to carry out the method for devulcanization of rubber, has following processing step: be the opening for feed of the vulcanized rubber powder adding cylindrical shell of 0.2-1.0mm with particle diameter, carry out appropriate compacting through the reinforced transportation section with compression ratio, be delivered to the extrusion shearing section of twin screw, pass through discontinuous five extrusion shearing sections successively, under heating condition under the extrusion shearing of dissimilar combined shear pieces, realize the desulfurization wholly or in part of rubber powder, generate the mixed type reclaimed rubber of complete desulfurization and partial desulfurization coexistence.
In the complete processing screw speed is controlled at 120rpm.GB13460-2003, tensile property and elongation at break testing standard are pressed in the mixing and sample preparation of reclaimed rubber: GB/T 1040-92, the testing standard of mooney viscosity: GB/T 1232.1-2000.After shearing desulphurization reaction, reclaimed rubber has obtained splendid revulcanization effect, tensile strength 15.1MPa, elongation at break 481.5%, mooney viscosity 62.
Claims (6)
1. twin screw devulcanization of rubber device, it is characterized in that: have cylindrical shell, be positioned at cylindrical shell in the same way the engagement twin screw and heating unit, cylindrical shell has opening for feed, and described twin screw comprises reinforced transportation section, two or more the mutual discontinuous extrusion shearing sections with compression ratio and is positioned at intersegmental screw rod transition section, the mixing section of adjacent two extrusion shearings; Described extrusion shearing section is two combined shear pieces that are meshed, and the combined shear piece is made up of two or more cams that are staggeredly located out, the angle difference that staggers of its adjacent cams of combined shear piece of different extrusion shearing sections.
2. the described twin screw devulcanization of rubber of claim 1 device, it is characterized in that: described screw rod transition section is 2～4, every section is 3～5 pitch.
3. the described twin screw devulcanization of rubber of claim 1 device, it is characterized in that: the compression ratio of described reinforced transportation section is 2:1 ~ 4:1.
4. the described twin screw devulcanization of rubber of claim 1 device, it is characterized in that: the length-to-diameter ratio L/D of described twin screw is 55:1～65:1.
5. the described twin screw devulcanization of rubber of claim 1 device, it is characterized in that: the material of described cylindrical shell and twin screw is highly wear-resisting alloy steel.
6. adopt the method for carrying out devulcanization of rubber as each described twin screw devulcanization of rubber device of claim 1 ~ 5, it is characterized in that having following processing step: be the opening for feed of the vulcanized rubber powder adding twin screw of 0.2-1.0mm with particle diameter, carry out appropriate compacting through the reinforced transportation section with compression ratio, be delivered to the extrusion shearing section of twin screw, pass through discontinuous each extrusion shearing section successively, under heating condition under the extrusion shearing of dissimilar combined shear pieces, realize the desulfurization wholly or in part of rubber powder, generate the mixed type reclaimed rubber of complete desulfurization and partial desulfurization coexistence.
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| CN2011102063514A CN102250381B (en) | 2011-07-22 | 2011-07-22 | Twin-screw device and method for rubber desulfurization |
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| CN102532590B (en) * | 2011-12-22 | 2014-04-23 | 谭永盛 | Desulfurization equipment |
| CN102875838B (en) * | 2012-10-16 | 2014-11-05 | 河南新艾卡橡胶工业有限公司 | Conveying roller and screw rod of high temperature desulfurization unit |
| CN104129057B (en) * | 2014-07-17 | 2016-10-05 | 青岛科技大学 | What a kind of scrap rubber serialization regenerated de-connects Plasticator and process |
| CN105599166B (en) * | 2015-12-28 | 2018-08-31 | 中胶橡胶资源再生（青岛）有限公司 | Molding multiscrew extrusion device and method of refining are refined for regnerated rubber powder |
| CN105860128A (en) * | 2016-04-10 | 2016-08-17 | 安徽众尚微波科技有限公司 | Microwave desulfurization and regeneration device for waste rubber |
| CN105881764A (en) * | 2016-07-01 | 2016-08-24 | 寿宁县信达特种橡胶有限公司 | Device for preparing environment-protection regenerated rubber and use method thereof |
| CN106633176B (en) * | 2017-01-25 | 2023-04-14 | 青岛科技大学 | Continuous recovery machine and recovery process for waste rubber |
| CN107234743B (en) * | 2017-06-15 | 2023-12-29 | 马鞍山宏力橡胶制品有限公司 | Waste rubber regeneration rubber compound production system |
| CN110552085A (en) * | 2018-05-30 | 2019-12-10 | 陈大伟 | polyester waste cloth and waste silk recycling system and recycling method thereof |
| DE102019219372A1 (en) | 2019-12-11 | 2021-06-17 | Continental Reifen Deutschland Gmbh | Method for devulcanizing a vulcanized rubber mixture, device for carrying out the method and the use of the device for devulcanizing a vulcanized rubber mixture |
| DE102020207121A1 (en) | 2020-06-08 | 2021-12-09 | Continental Reifen Deutschland Gmbh | Method for devulcanizing a vulcanized rubber mixture, device for carrying out the method and uses of the device as well as rubber mixture as well as pneumatic vehicle tires or technical rubber articles, comprising a component made from the rubber mixture |
| CN114957790A (en) * | 2022-05-25 | 2022-08-30 | 镇江明润信息科技有限公司 | Reclaimed rubber production method |
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Effective date of registration: 20171117 Address after: Daitou town of Liyang City Ferry Street 213311 Jiangsu city of Changzhou province 8-2 No. 7 Patentee after: Liyang Chang Technology Transfer Center Co., Ltd. Address before: Gehu Lake Road Wujin District 213164 Jiangsu city of Changzhou province No. 1 Patentee before: Changzhou University |