RU2130952C1 - Method of manufacturing tyre regenerate - Google Patents

Method of manufacturing tyre regenerate Download PDF

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Publication number
RU2130952C1
RU2130952C1 RU97102229A RU97102229A RU2130952C1 RU 2130952 C1 RU2130952 C1 RU 2130952C1 RU 97102229 A RU97102229 A RU 97102229A RU 97102229 A RU97102229 A RU 97102229A RU 2130952 C1 RU2130952 C1 RU 2130952C1
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Russia
Prior art keywords
rubber
regenerate
crumb
devulcanization
mixing
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RU97102229A
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Russian (ru)
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RU97102229A (en
Inventor
Г.Я. Гавриленко
В.М. Зубков
Ю.М. Штейнберг
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Товарищество с ограниченной ответственностью фирма "Астор"
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Priority to RU97102229A priority Critical patent/RU2130952C1/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/62Plastics recycling; Rubber recycling

Abstract

FIELD: rubber industry. SUBSTANCE: method is first of all distinguished by using tyre crumb obtained by barodestruction disintegration. Process conditions and chemical reagents are selected to provide rubber devulcanization, that is to give a maximum destruction of polysulfide bonds and simultaneously prevent rubber molecule destruction. Resultant regenerate, when recurred, shows high level of mechanical properties and contains little volatile and extractable admixtures. Rubber crumb is mixed with other ingredients, devulcanization is accomplished through mechanical destruction, and regenerate is refined on special rolls. EFFECT: avoided gas emission and prevented environmental pollution. 2 cl, 1 tbl

Description

 The invention relates to rubber technology in the rubber regeneration section.

 It is known [1-Encyclopedia of Polymers, vol. 3, "Sov. Enz," 1977, p. 888-895], that in the rubber industry in terms of volume in the first place is the tire industry. About 50% of the total rubber consumption, as well as a significant proportion of chemical fibers, are spent on the manufacture of tires intended for cars and trucks, motorcycles, airplanes, agricultural machinery.

 On the other hand, worn tires with uncontrolled cluttering of forests, ponds, yards harm the environment as well as the destruction of their burning.

 Meanwhile, worn-out tires can be a source of cheap polymer raw materials upon receipt of regenerate from them. A regenerate is a rubber mixture capable of being mixed with rubber components and subjected to repeated vulcanization.

The main process of regenerate production - devulcanization - is usually carried out by heating the crushed rubber with softeners for several hours at a temperature of 160-200 o C [2, 3, 2-Century C. Shein and others. The main processes of rubber production, M., "Chemistry", 1989. 3-V.F. Drozdovsky. Rubber and Rubber, 1994, N 3, p. 36-42].

 Currently, the widespread continuous thermomechanical method of rubber regeneration, selected as a prototype [2].

 However, this method of obtaining the regenerate is energy-intensive, accompanied by significant gas evolution of the products of thermal decomposition of rubber, the resulting regenerate has limited use.

 The technical problem to which the invention is directed is the development of an economical, environmentally friendly method for producing regenerate. At the same time, the regenerate should have a set of properties that ensure its widespread use in rubber products.

 The essential features characterizing the invention are as follows.

 Limiting signs: devulcanization occurs under the influence of an intense destructive effect of mechanical energy. Devulcanization is carried out in the presence of a special chemical activator.

Features:
A method of producing regenerate from tire crumb includes the steps of mixing the ingredients in a mixer of bulk components, devulcanization of rubber in a cam extruder and on rollers at a temperature not exceeding 100 o C.

 To obtain the regenerate, tire crumbs up to 2.8 mm in size are obtained, obtained by the baro-destruction method of grinding (see RF patent 2042511). A distinctive feature of such a crumb is its developed surface, which increases the susceptibility of the crumb to the effects of devulcanizing factors.

 The process of obtaining the regenerate is carried out in the presence of chemical reagents. Compounds of the thiazole or disulfide type are used as chemical activators: phenol sulfide, bis (trichlorophenyl) disulfide, bis (o-benzamidophenyl) disulfide, 2,2'-dibenzothiazoldisulfide and 2-mercaptobesothiazole; as softeners - rosin and bitumen.

The temperature mode of operation in the extruder is 70-100 o C, on the rollers 30-60 o C. The technological regimes for producing the regenerate and chemical reagents are selected in such a way as to ensure rubber devulcanization, i.e. destroy transverse, most often polysulfide bonds, while preserving the rubber molecule as much as possible from thermal degradation. This allows you to get a high molecular weight rubber compound with plasticity, and after repeated vulcanization - rubber with a high level of mechanical properties. A measure of destruction is the amount of extractable impurities. The extract contains softeners as well as a sol fraction, which is a low molecular weight impurity that is not related to the overall spatial structure of the vulcanizate. The content of emollients is estimated by acetone extract. The content of the sol fraction is estimated, as a rule, by chloroform or toluene extract.

 The process of regeneration at moderate temperatures allows it to be carried out without cooling with water and steam, therefore, the regenerate obtained by the proposed method does not contain water. It also does not contain maleic acid, which is not introduced in the proposed method. All this ensures the high quality of the obtained regenerate and creates prospects for its use in rubber products.

 The undoubted advantage of the proposed method for producing regenerate is the low cost of the latter, which is achieved by low energy consumption and the use of cheap, non-deficient, domestically produced chemical components.

 Examples of the method for producing tire regenerate are given below.

 Example 1

1. The preparation of the mixture in the mixer for bulk components at a temperature of 25 ± 10 o C composition, parts by weight:
Tire crumb up to 2.8 mm - 100.0
2,2'-Dibenzothiazole disulfide - 0.5
Rosin - 6.0
Bitumen BN 70/30 - 10.0
2. The screw conveyor feeds the mixture into a cam extruder.

3. Mixing, melting of refractory components, averaging the mixture, devulcanization in a cam extruder. The temperature of the mixture is 70 - 100 o C.

 4. Transportation of the mixture for rolling (conveyor).

5. Refinement of the mixture on regenerative-mixing or mixing-leaf rollers. Processing temperature 35-60 o C. Rolling time 5-15 minutes

6. Cleaning of non-expanded particles on refining rollers at a temperature of 30-50 o C. Winding, packaging, labeling.

 Example 2

1. Preparation in a mixer for bulk components at a temperature of 25 ± 10 o C a mixture of the following composition, parts by weight:
Tire crumb less than 2.8 mm - 100.0
2-Mercaptobenzothiazole - 0.4
Rosin - 2.0
Lac-bitumen - 15.0
2. Transportation of the mixture for rolling.

3. Rolling on regenerative-mixing or mixing-leaf rollers at a temperature of the work roll of 50-60 o C, idle 40-50 o C. The thickness of the web is not more than 0.5 mm. Rolling time 10-15 minutes.

 4. Calibration of the canvas, packaging, labeling.

 Example 3

 1. Preparation, devulcanization on regenerative-mixing or mixing-leaf rollers of a mixture of the following composition, parts by weight

Tire crumb <1 mm - 20.0
Tire crumbs 2.1-2.8 mm - 80.0
2,2'-Dibenzothiazole disulfide - 0.3
Rosin - 5.0
High-melting brittle bitumen - 5.0
The temperature of the work roll 50-60 o C, idle roll 30-50 o C. Rolling time 10-20 minutes

 2. Calibration of the canvas with a thickness of 2 - 5 mm, packaging, labeling.

 The choice of technological regimes for obtaining the regenerate is determined by the available equipment, as well as the requirements for the regenerate due to its further use.

 The properties of the obtained regenerate and prototype are shown in table 1.

The mechanical properties (items 4, 5) are presented for samples of the regenerate after vulcanization at a temperature of 143 o C for 15 minutes Samples contain a vulcanizing sulfur-accelerating group.

For the manufacture of the regenerate is used:
Tire crumb obtained by the barodestruction method no larger than 2.8 mm in size
Pine rosin according to GOST 19113-84
Bitumen petroleum high-melting softener in accordance with GOST 781-78
Roofing bitumen in accordance with GOST 9548-71
Construction bitumen in accordance with GOST 6617-76
2,2'-Dibenzothiazole disulfide according to GOST 7087-75
2-Mercaptobenzthiazole according to GOST 739-74
The data presented in table 1 indicate that the obtained regenerate exceeds the prototype in terms of mechanical properties, contains less volatile and extractable impurities, especially in chloroform extract, which indicates that it contains a polymer with a higher molecular weight and better molecular weight distribution. The ability to obtain a vulcanized sample without the addition of curing agents is also due to the fact that with the proposed method for producing regenerate, the polysulfide bonds are destroyed, which are restored by thermostating. Upon receipt of the regenerate by the thermomechanical method, a deep destruction of the polymer chain occurs with a relatively small decomposition of polysulfide bonds.

Claims (2)

1. A method of producing a tire regenerate, comprising mixing the ingredients with rubber tire crumb and devulcanization by mechanical degradation in the presence of activators, followed by purification of the regenerate on refining rollers, characterized in that rubber crumb obtained by tire destruction grinding of tires is used as rubber tire crumb, as the ingredients used bitumen and rosin, as an activator - an activator of a thiazole or polysulfide type, while mixing rubber tire crumbs with ingredients and the activator is carried out in a mixer for bulk components at a temperature of 25 ± 10 o C, averaging of the mixture, melting of refractory components and partial devulcanization is carried out in a cam extruder at a temperature of 70 - 100 o C, the devulcanization is completed on regenerative mixing, mixing and leaf rollers at a temperature 30 - 60 o C or a mixture of crumb rubber with ingredients and activators, averaging the mixture, melting the refractory components and devulcanization is carried out on regenerative mixing, mixing and leafing wa lts at a temperature of 30 - 60 o C.
2. The method according to claim 1, characterized in that the rubber tire crumb, rosin, bitumen and activator are used in the following ratio of components, wt. hours:
Rubber tire crumb - 100.0
Activator - 0.3 - 0.5
Rosin - 2.0 - 6.0
Bitumen - 5.0 - 15.0
RU97102229A 1997-02-19 1997-02-19 Method of manufacturing tyre regenerate RU2130952C1 (en)

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RU2130952C1 true RU2130952C1 (en) 1999-05-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ300227B6 (en) * 2001-08-08 2009-03-25 Ester, Spol. S R. O. Waste rubber recycling process

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101434710B (en) * 2008-12-18 2010-07-14 泰安市金山橡胶工业有限公司 Automatic rubber powder plasticizing process and apparatus thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
1. В.С.Шеин, Ю.Ф.Шутилин, А.Б.Гриб. Основные процессы резинового производства. - М.: Химия, 1989, с. 145 - 152. Энциклопедия полимеров. - М.: Советская энциклопедия, т. 3, с. 888 - 895. В.Ф.Дроздовский. Каучук и резина. - М.: Химия, 1994, N 3, с. 36 - 42. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ300227B6 (en) * 2001-08-08 2009-03-25 Ester, Spol. S R. O. Waste rubber recycling process

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Effective date: 20110220