CN111234310A - Preparation method of fine rubber powder of activated waste rubber - Google Patents
Preparation method of fine rubber powder of activated waste rubber Download PDFInfo
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 106
- 239000005060 rubber Substances 0.000 title claims abstract description 106
- 239000000843 powder Substances 0.000 title claims abstract description 78
- 239000002699 waste material Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 46
- 238000010008 shearing Methods 0.000 claims abstract description 40
- 238000012216 screening Methods 0.000 claims abstract description 26
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 230000003213 activating effect Effects 0.000 claims abstract description 8
- 238000011268 retreatment Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 17
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical group C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 claims description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 7
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(2+);cobalt(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 claims description 6
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 6
- 239000004408 titanium dioxide Substances 0.000 claims description 5
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 4
- MHKLKWCYGIBEQF-UHFFFAOYSA-N 4-(1,3-benzothiazol-2-ylsulfanyl)morpholine Chemical compound C1COCCN1SC1=NC2=CC=CC=C2S1 MHKLKWCYGIBEQF-UHFFFAOYSA-N 0.000 claims description 3
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 3
- 239000005751 Copper oxide Substances 0.000 claims description 3
- 229910000431 copper oxide Inorganic materials 0.000 claims description 3
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 claims description 3
- STSDHUBQQWBRBH-UHFFFAOYSA-N n-cyclohexyl-1,3-benzothiazole-2-sulfonamide Chemical compound N=1C2=CC=CC=C2SC=1S(=O)(=O)NC1CCCCC1 STSDHUBQQWBRBH-UHFFFAOYSA-N 0.000 claims description 3
- 229940032017 n-oxydiethylene-2-benzothiazole sulfenamide Drugs 0.000 claims description 3
- HNWAHFPYJHAAJE-UHFFFAOYSA-N n-tert-butyl-1,3-benzothiazole-2-sulfonamide Chemical compound C1=CC=C2SC(S(=O)(=O)NC(C)(C)C)=NC2=C1 HNWAHFPYJHAAJE-UHFFFAOYSA-N 0.000 claims description 3
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 3
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 3
- PWRZMDSBIGVTSF-UHFFFAOYSA-N s-(4,5-dicyclohexyl-1,3-benzothiazol-2-yl)thiohydroxylamine Chemical compound C1CCCCC1C1=CC=C2SC(SN)=NC2=C1C1CCCCC1 PWRZMDSBIGVTSF-UHFFFAOYSA-N 0.000 claims description 3
- -1 argil Substances 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000013543 active substance Substances 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 5
- 239000000654 additive Substances 0.000 abstract description 3
- 230000000996 additive effect Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000010426 asphalt Substances 0.000 description 15
- 238000003756 stirring Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 150000001875 compounds Chemical class 0.000 description 8
- 238000004806 packaging method and process Methods 0.000 description 7
- 230000004913 activation Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 239000000543 intermediate Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000002861 polymer material Substances 0.000 description 3
- 239000012048 reactive intermediate Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000000635 electron micrograph Methods 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- 150000002894 organic compounds Chemical group 0.000 description 2
- 238000010092 rubber production Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical group C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 229920006271 aliphatic hydrocarbon resin Polymers 0.000 description 1
- 229920006272 aromatic hydrocarbon resin Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- IUYLTEAJCNAMJK-UHFFFAOYSA-N cobalt(2+);oxygen(2-) Chemical compound [O-2].[Co+2] IUYLTEAJCNAMJK-UHFFFAOYSA-N 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(II) oxide Inorganic materials [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229920006226 ethylene-acrylic acid Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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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
- C08J11/16—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 by treatment with inorganic material
-
- 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
- C08J11/18—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 by treatment with organic material
- C08J11/28—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 by treatment with organic material by treatment with organic compounds containing nitrogen, sulfur or phosphorus
-
- 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
- C08J2319/00—Characterised by the use of rubbers not provided for in groups C08J2307/00 - C08J2317/00
-
- 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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- 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)
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention belongs to the technical field of waste rubber recovery, and particularly relates to a preparation method of fine rubber powder of activated waste rubber, which comprises the following steps of (a) uniformly mixing waste rubber coarse powder with an activating auxiliary agent, and then adding a screening aid to be uniformly mixed to obtain a first mixture; (b) conveying the first mixture to a shearing and tearing device through a conveying belt, and shearing and tearing to obtain a second mixture; (c) vibrating and screening the second mixture to obtain undersize components, namely fine rubber powder, and returning the oversize components to the shearing and tearing device for retreatment; in the step (a), the active assistant comprises an inorganic assistant and an organic assistant, and the weight ratio of the inorganic assistant to the organic assistant is as follows: 20-100% of organic auxiliary agent: 100. in the invention, after the crude rubber powder and the active additive are mixed, the rubber powder is activated under the action of the inorganic active agent and the organic active agent by mechanical tearing, thereby reducing the energy consumption and the production cost.
Description
Technical Field
The invention belongs to the technical field of waste rubber recovery, and particularly relates to a preparation method of activated waste rubber fine rubber powder.
Background
China is a large rubber consumption country, and according to statistics, the China consumes 1010 ten thousand tons of rubber in 2017, and is also the country with the highest waste rubber production, and the quantity of the rubber is about 18 ten thousand tons every year. A large amount of waste rubber products are produced, so that not only is a large amount of land occupied, but also a hotbed generated by bacteria and insect pests is generated, and the environment is increasingly worsened. Therefore, the recycling of the waste rubber can reduce the use of raw rubber, particularly non-renewable synthetic rubber, and is also an important method for reducing environmental pollution. At present, the waste rubber is mainly utilized in a direct use mode, a reclaimed rubber production mode and a rubber powder production mode. Among them, the number of direct uses of rubber products is limited; the production of reclaimed rubber consumes a large amount of energy, and generates a large amount of waste gas and waste liquid in the production process, so that the post-treatment is difficult, and the secondary pollution to the environment is easy to cause. The production of rubber powder by mechanically cutting and crushing waste rubber products is one of the existing energy-saving and low-pollution treatment methods. However, in the existing mechanical treatment method, only the rubber powder is simply crushed, the rubber is not desulfurized, and the cross-linking bonds among rubber molecular chains are not broken, so that the activity of the rubber powder is low, and the mechanical property of the composite material is reduced by adding the rubber powder into high polymer materials such as asphalt and the like. Therefore, it is a continuous pursuit goal of researchers to improve the activity of the waste rubber powder, improve the performance of polymer materials such as rubber powder modified asphalt and the like and widen the application of the polymer materials.
In the patent, in the crushing process, C5 aliphatic hydrocarbon resin, C9 aromatic hydrocarbon resin, copolymer of ethylene-acrylic acid and esters thereof, styrene-butadiene copolymer resin and the like are used as compatibilizers to improve the surface activity, affinity and permeability of rubber powder, but in the patent, the used solubilizer is single, the compatibilization effect of the solubilizer is still to be improved, and the rubber powder treated by the patent has poor surface activity and low adhesion with crude rubber or asphalt, so that the mechanical property of a composite material can be reduced. On the other hand, the prior art has complex process for preparing the activated rubber powder, low production efficiency and still larger energy consumption.
Disclosure of Invention
The invention aims to: the method solves the defects in the prior art, provides a method for treating waste rubber, and improves the surface activity of vulcanized rubber.
In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method of activated waste rubber fine rubber powder comprises the following steps,
(a) uniformly mixing the waste rubber coarse powder and the activating auxiliary agent, and then adding the screening aid and uniformly mixing to obtain a first mixture;
(b) conveying the first mixture to a shearing and tearing device through a conveying belt, and shearing and tearing to obtain a second mixture;
(c) vibrating and screening the second mixture to obtain undersize components, namely fine rubber powder, and returning the oversize components to the shearing and tearing device for retreatment;
in the step (a), the active assistant comprises an inorganic assistant and an organic assistant, and the weight ratio of the inorganic assistant to the organic assistant is as follows: 20-100% of organic auxiliary agent: 100.
in the invention, after the crude rubber powder and the active additive are mixed, the rubber powder is activated under the action of the inorganic active agent and the organic active agent by mechanical tearing, thereby reducing the energy consumption and the production cost.
Under the action of mechanical force, S between molecular chains in rubber molecules of vulcanized rubbern(n is more than or equal to 0 and less than or equal to 8) the bond is broken to form two active free radicals of Sx and Sy. The inorganic active auxiliary agent and the organic active auxiliary agent react to form an active intermediate product, the active intermediate product can capture active free radicals Sx and Sy and form an intermediate transition compound, the intermediate transition compound is decomposed into a stable product containing Sx and Sy, the product is not easy to decompose, the active free radicals in the rubber are greatly reduced, the collision probability of the active free radicals is reduced, the possibility of recombination of the Sx and Sy active free radicals to generate a secondary crosslinking reaction is greatly reduced, the activity of a molecular chain on the surface of the rubber powder is increased, and the activity of the rubber powder is also improved.
Further, in the step (a), the raw materials are calculated according to parts by weight;
100 parts of waste rubber coarse powder,
2-8 parts of an activating auxiliary agent,
1-5 parts of a screening aid.
When the active assistant is more than 8 parts, the effect of the active assistant is not increased, but excessive low-molecular substances are introduced, and frost is separated out on the surface of the rubber powder to form an isolating membrane, so that the interface bonding with substances such as asphalt is poor, and the comprehensive performance of the subsequent modified composite material is reduced. Therefore, in the invention, the active auxiliary agent is arranged at 2-8 parts, which not only can play a better activation role, but also can avoid forming an isolating film on the surface of the rubber powder to influence the binding property of the activated rubber powder and substances such as asphalt.
Further, in the step (a), the temperature for mixing the waste rubber coarse powder and the activating assistant is 80-150 ℃. At this temperature, the coagent is most effective in activating.
Further, the inorganic auxiliary agent is one or a mixture of more of titanium dioxide, cobaltosic oxide, nickel oxide, copper oxide and manganese oxide. The organic auxiliary agent is 2-mercaptobenzothiazole, dibenzothiazyl disulfide, N-tertiary butyl-2-benzothiazole sulfonamide, N-cyclohexyl-2-benzothiazole sulfonamide and N, N; dicyclohexyl-2-benzothiazolesulfenamide, N-oxydiethylene-2-benzothiazolesulfenamide.
In the invention, the inorganic assistant is an oxide of transition metal, the organic assistant is an organic compound which is a compound containing thiazole functional groups, the transition metal oxide and the organic compound form a reactive intermediate, and the reactive intermediate compound (4) is produced by taking titanium dioxide and 2-mercaptobenzothiazole as examples according to the following equation;
under the action of mechanical force, Sn is broken to generate two free radicals of Sx and Sy, as shown in the following equation:
the reactive intermediate compound (4) generated by the inorganic auxiliary agent and the organic auxiliary agent reacts with the free radicals (2) and (3) to generate an intermediate compound (5), and the intermediate compound (5) is decomposed into stable compounds (6) and (7), and the reaction equation is shown as follows:
furthermore, the screening aid is one or a mixture of more of carbon black, talcum powder, argil, calcium carbonate and barium sulfate.
Furthermore, the particle size of the rubber coarse powder is 4-18 meshes, and the particle size of the fine rubber powder is less than 40 meshes. In the invention, mechanical desulfurization is to desulfurize molecular chains on the surface of rubber powder, if the particle size of the rubber powder is too large, the surface area of unit mass is small, so that the number of the molecular chains on the surface of the rubber powder is small, and the number of active molecular chains subjected to activation treatment is correspondingly reduced, so that the activity of rubber powder is insufficient. The rubber powder has too small particle size, so that the energy consumption is high and the production efficiency is low; secondly, the performance of the subsequent modified composite material is improved to a limited extent. Therefore, in the invention, the particle size of the rubber coarse powder is 4-18 meshes, the skill ensures that the rubber powder has enough specific surface area, the activation efficiency of the rubber is ensured, and the energy consumption can be reduced.
Furthermore, the particle size of the screening aid is 800-2500 meshes.
Further, the shearing and tearing device is provided with a pair of squeezing rollers, the surface of each squeezing roller is provided with 8-14 grooves, the depth of each groove is 5mm, and the width of each groove is 10-20 mm.
Furthermore, the clearance between the two extrusion rollers is 0.1-0.8 mm.
The invention has the beneficial effects that:
in the invention, after the crude rubber powder and the active additive are mixed, the rubber powder is activated under the action of the inorganic active agent and the organic active agent by mechanical tearing, thereby reducing the energy consumption and the production cost.
Drawings
FIG. 1 is an electron micrograph of the rubber powder treated in comparative example 1;
FIG. 2 is an electron micrograph of the rubber powder treated in example 1.
Detailed Description
Example 1: stirring and mixing 100 parts of crude waste rubber powder, 3 parts of titanium dioxide and 5 parts of 2-mercaptobenzothiazole for 20min at the temperature of 130 ℃, adding talcum powder and stirring for 15min to obtain a mixture 1; conveying the mixture 1 into a shearing and tearing device through a conveying belt for shearing and tearing to obtain a mixture 2; screening the mixture 2 by a vibration screening device to obtain an oversize component and an undersize component; measuring and packaging the components below the sieve; the oversize components are conveyed by a conveyer belt to return to the shearing and tearing device for shearing and tearing. In this example, the particle size of the coarse rubber powder is 18 meshes, i.e., the coarse rubber powder is sieved by 18 meshes, and the undersize component is selected. The particle size of the talcum powder is 800 meshes.
Example 2: stirring and mixing 100 parts of crude waste rubber powder, 3 parts of cobaltous oxide and 3 parts of dibenzothiazyl disulfide for 20min at the temperature of 80 ℃, adding 1 part of calcium carbonate, and stirring for 15min to obtain a mixture 1; conveying the mixture 1 into a shearing and tearing device through a conveying belt for shearing and tearing to obtain a mixture 2; screening the mixture 2 by a vibration screening device to obtain an oversize component and an undersize component; measuring and packaging the components below the sieve; the oversize components are conveyed by a conveyer belt to return to the shearing and tearing device for shearing and tearing. In this embodiment, the coarse rubber powder has a particle size of 10 mesh, and the calcium carbonate has a particle size of 1000 mesh
Example 3: stirring and mixing 100 parts of crude waste rubber powder, 1 part of cobaltosic oxide and 1 part of N-tert-butyl-2-benzothiazole sulfonamide for 20min at the temperature of 150 ℃, adding 3 parts of carbon black, and stirring for 15min to obtain a mixture 1; conveying the mixture 1 into a shearing and tearing device through a conveying belt for shearing and tearing to obtain a mixture 2; screening the mixture 2 by a vibration screening device to obtain an oversize component and an undersize component; measuring and packaging the components below the sieve; the oversize components are conveyed by a conveyer belt to return to the shearing and tearing device for shearing and tearing. In this embodiment, the particle size of the coarse rubber powder is 4 mesh, and the particle size of the carbon black is 2500 mesh.
Example 4: stirring and mixing 100 parts of crude waste rubber powder, 2 parts of nickel oxide and 3 parts of N-cyclohexyl-2-benzothiazole sulfonamide for 30min at the temperature of 100 ℃, adding 2 parts of argil and stirring for 15min to obtain a mixture 1; conveying the mixture 1 into a shearing and tearing device through a conveying belt for shearing and tearing to obtain a mixture 2; screening the mixture 2 by a vibration screening device to obtain an oversize component and an undersize component; measuring and packaging the components below the sieve; the oversize components are conveyed by a conveyer belt to return to the shearing and tearing device for shearing and tearing. In this embodiment, the particle size of the coarse rubber powder is 10 mesh, and the particle size of the clay is 2500 mesh.
In other embodiments of the present invention, the inorganic assistant may also be copper oxide, manganese oxide, or the like, or a combination of the above inorganic assistants may be used as the inorganic assistant. The organic auxiliary agent can also be N, N; dicyclohexyl-2-benzothiazolesulfenamide, N-oxydiethylene-2-benzothiazolesulfenamide, and the like, and a combination of the above organic auxiliary agents may be used as the organic auxiliary agent.
Comparative example 1: stirring and mixing 100 parts of crude waste rubber powder for 20min at the temperature of 130 ℃, adding talcum powder and stirring for 15min to obtain a mixture 1; conveying the mixture 1 into a shearing and tearing device through a conveying belt for shearing and tearing to obtain a mixture 2; screening the mixture 2 by a vibration screening device to obtain an oversize component and an undersize component; measuring and packaging the components below the sieve; the oversize components are conveyed by a conveyer belt to return to the shearing and tearing device for shearing and tearing.
Comparative example 2: stirring and mixing 100 parts of crude waste rubber powder and 3 parts of titanium dioxide for 20min at the temperature of 130 ℃, adding talcum powder and stirring for 15min to obtain a mixture 1; conveying the mixture 1 into a shearing and tearing device through a conveying belt for shearing and tearing to obtain a mixture 2; screening the mixture 2 by a vibration screening device to obtain an oversize component and an undersize component; measuring and packaging the components below the sieve; the oversize components are conveyed by a conveyer belt to return to the shearing and tearing device for shearing and tearing.
Comparative example 3: stirring and mixing 100 parts of crude waste rubber powder and 5 parts of 2-mercaptobenzothiazole for 20min at the temperature of 130 ℃, adding talcum powder and stirring for 15min to obtain a mixture 1; conveying the mixture 1 into a shearing and tearing device through a conveying belt for shearing and tearing to obtain a mixture 2; screening the mixture 2 by a vibration screening device to obtain an oversize component and an undersize component; measuring and packaging the components below the sieve; the oversize components are conveyed by a conveyer belt to return to the shearing and tearing device for shearing and tearing.
Experimental example:
the activated rubber powders obtained in examples 1 to 4 and comparative examples 1 to 3 were dried in an oven at 110 ℃ for 2.5 hours; putting the asphalt in an oven to be heated and softened at 180 ℃, weighing a certain amount of asphalt and putting the asphalt on an electric furnace to be heated and kept at 180 ℃; after that, the dried rubber powder is measured and poured into the asphalt, the mixture is stirred by a high-speed shearing instrument at the speed of 2000r/min, the temperature is kept at 180 +/-5 ℃, the stirring time is 1h, an asphalt mixture is obtained, and the 25 ℃ penetration/10 of the mixed asphalt is detected-1mm, viscosity at 175 ℃ per pa · s and storage stability of △ T/DEG C, the detection methods are carried out according to corresponding national standards, and the detection results are shown in the following table:
TABLE 1 examination results of examples 1 to 4 and comparative examples 1 to 3
In comparative example 1, no coagent was added to the crude waste rubber, in comparative example 2, only the inorganic coagent was added, in comparative document 3, only the organic coagent was added, and the remaining processing steps were the same as those of example 1.
It can be seen from the above table that, compared with comparative examples 1, 2 and 3, the active rubber powders of comparative examples 2 and 3 are prepared by adding inorganic auxiliary agents or auxiliary agents, and the penetration at 25 ℃ of the mixed asphalt is slightly increased, the viscosity at 175 ℃ is slightly reduced, and the storage stability is slightly increased, but the increase is not obvious.
Compared with comparative examples 1-3, the activated rubber powders of examples 1-4 were prepared by adding both inorganic and organic additives, and after mixing the activated rubber powders of examples 1-4 with asphalt, the penetration at 25 ℃ was significantly increased, the viscosity at 175 ℃ was greatly reduced, and the storage stability was also greatly increased. The reason is that after the rubber powder is subjected to surface activation reaction by the activation aid, cross-linking bonds among molecular chains are opened, the three-dimensional network structure of rubber powder molecules is greatly damaged, and light components in the asphalt can well penetrate into the rubber, so that the compatibility of the asphalt and the rubber is greatly improved.
Claims (10)
1. A preparation method of activated waste rubber fine rubber powder is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(a) uniformly mixing the waste rubber coarse powder and the activating auxiliary agent, and then adding the screening aid and uniformly mixing to obtain a first mixture;
(b) conveying the first mixture to a shearing and tearing device through a conveying belt, and shearing and tearing to obtain a second mixture;
(c) vibrating and screening the second mixture to obtain undersize components, namely fine rubber powder, and returning the oversize components to the shearing and tearing device for retreatment;
in the step (a), the active assistant comprises an inorganic assistant and an organic assistant, and the weight ratio of the inorganic assistant to the organic assistant is as follows: 20-100% of organic auxiliary agent: 100.
2. the method for preparing the activated waste rubber fine powder according to claim 1, wherein the method comprises the following steps: in the step (a), the raw materials are counted by weight;
100 parts of waste rubber coarse powder,
2-8 parts of an activating auxiliary agent,
1-5 parts of a screening aid.
3. The method for preparing the activated waste rubber fine powder according to claim 1, wherein the method comprises the following steps: in the step (a), the temperature for mixing the waste rubber coarse powder and the activating assistant is 80-150 ℃.
4. The method for preparing the activated waste rubber fine powder according to claim 1, wherein the method comprises the following steps: the inorganic auxiliary agent is one or a mixture of more of titanium dioxide, cobaltosic oxide, nickel oxide, copper oxide and manganese oxide.
5. The method for preparing the activated waste rubber fine powder according to claim 1, wherein the method comprises the following steps: the organic auxiliary agent is 2-mercaptobenzothiazole, dibenzothiazyl disulfide, N-tertiary butyl-2-benzothiazole sulfonamide, N-cyclohexyl-2-benzothiazole sulfonamide and N, N; dicyclohexyl-2-benzothiazolesulfenamide, N-oxydiethylene-2-benzothiazolesulfenamide.
6. The method for preparing the activated waste rubber fine powder according to claim 1, wherein the method comprises the following steps: the screening aid is one or a mixture of more of carbon black, talcum powder, argil, calcium carbonate and barium sulfate.
7. The method for preparing the activated waste rubber fine powder according to claim 1, wherein the method comprises the following steps: the particle size of the coarse rubber powder is 4-18 meshes, and the particle size of the fine rubber powder is less than 40 meshes.
8. The method for preparing the activated waste rubber fine powder according to claim 1, wherein the method comprises the following steps: the particle size of the screening aid is 800-2500 meshes.
9. The method for preparing the activated waste rubber fine powder according to claim 1, wherein the method comprises the following steps: the shearing and tearing device is provided with a pair of squeezing rollers, the surfaces of the squeezing rollers are provided with 8-14 grooves, the depth of each groove is 5mm, and the width of each groove is 10-20 mm.
10. The method for preparing the activated waste rubber fine powder according to claim 7, wherein the method comprises the following steps: the clearance between the two extrusion rollers is 0.1-0.8 mm.
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