(IN-324529) Method and apparatus for regenerating vulcanized rubber 机翻标题: 暂无翻译,请尝试点击翻译按钮。

源语言标题
(IN-324529) Method and apparatus for regenerating vulcanized rubber
公开号/公开日
IN324529 IN2555/KOLNP/2012 / 2019-11-06 2013-06-07
申请号/申请日
IN2555/KOLNP/2012 / 2012-09-07
发明人
MARTEL Sylvain MURPHY Stephen LEGAULT Patrick
申请人
PHOENIX INNOVATION TECHNOLOGY
主分类号
IPC分类号
B01F-007/02 C08C-019/08 C08J-011/12
摘要
(IN324529)
There are disclosed a regenerated rubber, a method and apparatus for obtaining regenerated rubbers from vulcanized crumb rubber, such as rubber from scrap.
 The apparatus is a thermokinetic mixer having the particularity to have an air tight stationary chamber with inner non-uniform surface.
 The method comprises the steps of raising the speed of the rotor shaft in order to increase a temperature of a mixture made of vulcanized crumb rubber and a lubricant, such as oil until a devulcanizing temperature is reached; and reducing the temperature of the mixture to a lower temperature during a second period of time.
 The method of the invention is environmentally friendly or green, since the regeneration method does not use chemicals, includes a shorter period of treatment at higher temperature avoiding the risks of rubber cracking and spontaneous combustion, and further allowing mass-production of regenerated rubber with lower energy consumption.
机翻摘要
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地址
代理人
代理机构
优先权号
2010US-61313871
主权利要求
(IN324529)
1. A method of regenerating vulcanized crumb rubber which comprises the steps of: a) introducing vulcanized crumb rubber and a lubricant into a first mixer, said lubricant being at room temperature; b) mixing said crumb rubber and lubricant at room temperature during an adequate period of time to form a mixture; c) transferring said mixture into a thermokinetic mixer, said thermokinetic mixer comprising: an air tight stationary chamber for receiving the mixture, said chamber having sidewalls provided with a cooling jacket, the sidewaiis having an inner non-uniform surface, the stationary chamber being also provided with a cooling injection system; and a rotor shaft co-axially extending into the chamber, said rotor shaft having blades extending from the shaft into the chamber and a controlled speed varying up to at least about 1800 rpm; and d) raising the speed of the rotor shaft in order to increase a temperature of the mixture during a first period of time until a devulcanizing temperature is reached; e) reducing the temperature of the mixture reached in step d) to a lower temperature during a second period of time by lowering rotational speed (rpm) of the rotor shaft, said step e) comprising: i. circulating water in the cooling jacket; ii. injecting a cooling agent within the stationary chamber which vaporizes at the contact of the mixture of the inner non-uniform surface of the stationary chamber, and which captures sulfur derivatives resulting from partial devulcanization occurring in step d); and iii. evacuating at least some of the vaporized cooling agent and sulfur derivatives from the stationary chamber; and f) recovering regenerated crumb rubber from the chamber.
2. The method as claimed in claim 1, wherein the devulcanizing temperature in step d) is reached when partial cleaving of carbon-sulphur or sulphur-sulphur bonds of the vulcanized rubber occurs.
3. The method as claimed in claim 1 or 2, wherein above about 50 % of an available internal volume of the chamber is occupied by said mixture.
4. The method as claimed in any one of claims 1 to 3, further comprising the step of: g) transferring the mixture out of the chamber into a cooling device to further cool the mixture to about 20 to 70DC within a period of time of about 10-45 seconds.
5. The method as claimed in any one of claims 1 to 4, wherein the controlled speed of the shaft is about 400 rpm when the temperature of the thermokinetic mixer is at about room temperature, and about 1400 to 2000 rpm when the temperature is at about the devulcanizing temperature.
6. The method as claimed in any one of claims 1 to 5, wherein step e) comprises reducing the speed of the rotor shaft to about 400 to 700 rpm.
7. The method as claimed in claim 6, wherein in step e), injecting a cooling agent is achieved by injecting the cooling agent in a form of a mist or a jet stream directly into the chamber.
8. The method as claimed in any one of claims 1 to 7, wherein the vulcanized crumb rubber is a by-product of recycled rubber from scrap.
9. The method as claimed in any one of claims 1 to 8, wherein the lubricant is carbon black, talc, paraffin, graphite, a process oil, a vegetable oil or a mixture thereof.
10. The method as claimed in any one of claims 1 to 9, wherein steps d) and e) are each performed within an interval of time between 7 to 60 seconds.
11. The method as claimed in any one of claims 1 to 10, wherein the devulcanizing temperature reached in step d) is the temperature at which the monosulfidic, disulfidic and polysulfidic cross-links of the vulcanized rubber are at least partially cleaved.
12. The method as claimed in any one of claims 1 to 11, wherein in step e), evacuating at least some of the vaporized cooling agent and sulfur derivatives from the stationary chamber is performed with a vacuum pump connected to the stationary chamber.
13. The method as claimed in any one of claims 1 to 12, wherein in step a) the lubricant is an inert lubricant and the quantity of lubricant present in the vulcanized crumb rubber is about 5 wt %.
14. A thermokinetic mixer for the regeneration of vulcanized crumb rubber using the method as claimed in claim 1, said thermokinetic mixer comprising: an air tight stationary chamber having an inlet for receiving a crumb rubber mixture, said stationary chamber having sidewalls provided with a cooling jacket, the sidewalls having an inner non-uniform surface; the stationary chamber being also provided with a cooling injection system for injection of a cooling agent within the stationary chamber, the cooling agent comprising water; the stationary chamber having an outlet for exiting regenerated crumb rubber; and a rotor shaft co-axially extending into the stationary chamber, said rotor shaft having blades extending from the shaft into the chamber and a controlled speed varying up to at least about 1800 rpm.
15. The thermokinetic mixer as claimed in claim 14, wherein the blades have an outer non-uniform surface.
16. The thermokinetic mixer as claimed in claim 14 or 15, wherein the non-uniform surface is a textured surface and/or a beaded non-smooth surface.
17. The thermokinetic mixer as claimed in claim 16, wherein said non-uniform surface is lined with hardened steel in the form of a welded bead or machined in the same form as the welded bead.
18. The thermokinetic mixer as claimed in any one of claims 14 to 17, wherein at least one of the blades is rotated or longitudinally twisted.
19. The thermokinetic mixer as claimed in any one of claims 14 to 18, wherein said blades are in a non-parallel relationship one to another.
20. The thermokinetic mixer as claimed in any one of claims 14 to 19, wherein the injection device comprises a nozzle device to inject the cooling agent into the chamber in a form of a mist or a jet stream.
21. The thermokinetic mixer as claimed in any one of claims 14 to 20, wherein the injection device comprises several nozzles extending in the sidewalls of the stationary chamber.
22. The thermokinetic mixer as claimed in any one of claims 14 to 21, further comprising a vacuum pump in connection with the stationary chamber for removing air out of the chamber.
23. The thermokinetic mixer as claimed in any one of claims 14 to 22, wherein the cooling agent is water which, when the thermokinetic mixer is in operation, vaporizes, carrying out sulphur derivatives from the partial devulcanization of the rubber, the vacuum pump evacuating at least some of the vaporized water and sulphur derivatives from the stationary chamber.
法律状态
GRANTED
专利类型码
B A
国别省市代码
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