CN111087645A - Controllable cracking process of reclaimed rubber - Google Patents
Controllable cracking process of reclaimed rubber Download PDFInfo
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- CN111087645A CN111087645A CN201911264126.9A CN201911264126A CN111087645A CN 111087645 A CN111087645 A CN 111087645A CN 201911264126 A CN201911264126 A CN 201911264126A CN 111087645 A CN111087645 A CN 111087645A
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- Prior art keywords
- rubber
- cracking
- catalyst
- reclaimed rubber
- agent
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 136
- 239000005060 rubber Substances 0.000 title claims abstract description 136
- 238000005336 cracking Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000008569 process Effects 0.000 title claims abstract description 36
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 46
- 239000003054 catalyst Substances 0.000 claims abstract description 35
- 239000002699 waste material Substances 0.000 claims abstract description 29
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 23
- 230000003213 activating effect Effects 0.000 claims abstract description 22
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 10
- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 claims description 47
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical group [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 45
- 229910015900 BF3 Inorganic materials 0.000 claims description 24
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 22
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 claims description 14
- 239000005662 Paraffin oil Substances 0.000 claims description 13
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 9
- 239000003921 oil Substances 0.000 claims description 9
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 claims description 7
- ZTHYODDOHIVTJV-UHFFFAOYSA-N Propyl gallate Chemical compound CCCOC(=O)C1=CC(O)=C(O)C(O)=C1 ZTHYODDOHIVTJV-UHFFFAOYSA-N 0.000 claims description 6
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 claims description 6
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 claims description 6
- 229910000288 alkali metal carbonate Inorganic materials 0.000 claims description 4
- 150000008041 alkali metal carbonates Chemical class 0.000 claims description 4
- IRFSXVIRXMYULF-UHFFFAOYSA-N 1,2-dihydroquinoline Chemical compound C1=CC=C2C=CCNC2=C1 IRFSXVIRXMYULF-UHFFFAOYSA-N 0.000 claims description 3
- SPSPIUSUWPLVKD-UHFFFAOYSA-N 2,3-dibutyl-6-methylphenol Chemical compound CCCCC1=CC=C(C)C(O)=C1CCCC SPSPIUSUWPLVKD-UHFFFAOYSA-N 0.000 claims description 3
- 239000002841 Lewis acid Substances 0.000 claims description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 3
- 235000021314 Palmitic acid Nutrition 0.000 claims description 3
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 150000001340 alkali metals Chemical class 0.000 claims description 3
- CZBZUDVBLSSABA-UHFFFAOYSA-N butylated hydroxyanisole Chemical compound COC1=CC=C(O)C(C(C)(C)C)=C1.COC1=CC=C(O)C=C1C(C)(C)C CZBZUDVBLSSABA-UHFFFAOYSA-N 0.000 claims description 3
- 235000010354 butylated hydroxytoluene Nutrition 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
- 235000011187 glycerol Nutrition 0.000 claims description 3
- 229910001385 heavy metal Inorganic materials 0.000 claims description 3
- 150000007517 lewis acids Chemical class 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 claims description 3
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- 229920000098 polyolefin Polymers 0.000 claims description 3
- 235000010388 propyl gallate Nutrition 0.000 claims description 3
- 239000000473 propyl gallate Substances 0.000 claims description 3
- 229940075579 propyl gallate Drugs 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 claims description 3
- 229960002447 thiram Drugs 0.000 claims description 3
- 229940099259 vaseline Drugs 0.000 claims description 3
- 239000001993 wax Substances 0.000 claims description 3
- 239000008096 xylene Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000012958 reprocessing Methods 0.000 abstract description 2
- 235000011181 potassium carbonates Nutrition 0.000 description 20
- ZRMMVODKVLXCBB-UHFFFAOYSA-N 1-n-cyclohexyl-4-n-phenylbenzene-1,4-diamine Chemical compound C1CCCCC1NC(C=C1)=CC=C1NC1=CC=CC=C1 ZRMMVODKVLXCBB-UHFFFAOYSA-N 0.000 description 12
- 239000000126 substance Substances 0.000 description 12
- 239000003963 antioxidant agent Substances 0.000 description 11
- 230000008929 regeneration Effects 0.000 description 9
- 238000011069 regeneration method Methods 0.000 description 9
- 230000003078 antioxidant effect Effects 0.000 description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 7
- 239000012190 activator Substances 0.000 description 7
- 238000010298 pulverizing process Methods 0.000 description 7
- 150000003254 radicals Chemical class 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 241000406668 Loxodonta cyclotis Species 0.000 description 4
- 230000032683 aging Effects 0.000 description 4
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000010907 mechanical stirring Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- OUBMGJOQLXMSNT-UHFFFAOYSA-N N-isopropyl-N'-phenyl-p-phenylenediamine Chemical compound C1=CC(NC(C)C)=CC=C1NC1=CC=CC=C1 OUBMGJOQLXMSNT-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000012668 chain scission Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000012188 paraffin wax Substances 0.000 description 3
- 239000010690 paraffinic oil Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 238000004227 thermal cracking Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- KZMGYPLQYOPHEL-UHFFFAOYSA-N Boron trifluoride etherate Chemical compound FB(F)F.CCOCC KZMGYPLQYOPHEL-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UTGQNNCQYDRXCH-UHFFFAOYSA-N N,N'-diphenyl-1,4-phenylenediamine Chemical compound C=1C=C(NC=2C=CC=CC=2)C=CC=1NC1=CC=CC=C1 UTGQNNCQYDRXCH-UHFFFAOYSA-N 0.000 description 2
- 239000003677 Sheet moulding compound Substances 0.000 description 2
- 239000004902 Softening Agent Substances 0.000 description 2
- 238000001994 activation Methods 0.000 description 2
- 239000000987 azo dye Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229940057995 liquid paraffin Drugs 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- -1 (6-tert-butyl-p-cresol) disulfide Chemical compound 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- SJEYSFABYSGQBG-UHFFFAOYSA-M Patent blue Chemical compound [Na+].C1=CC(N(CC)CC)=CC=C1C(C=1C(=CC(=CC=1)S([O-])(=O)=O)S([O-])(=O)=O)=C1C=CC(=[N+](CC)CC)C=C1 SJEYSFABYSGQBG-UHFFFAOYSA-M 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000980 acid dye Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 150000004984 aromatic diamines Chemical class 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 231100000481 chemical toxicant Toxicity 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
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- 238000005194 fractionation Methods 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011968 lewis acid catalyst Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000004682 monohydrates Chemical class 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010060 peroxide vulcanization Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012492 regenerant Substances 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010058 rubber compounding Methods 0.000 description 1
- 238000010092 rubber production Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000000988 sulfur dye Substances 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 150000004684 trihydrates Chemical class 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
Classifications
-
- 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
- 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
- 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
- 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
Landscapes
- 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)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention relates to reprocessing of waste rubber, in particular to a controllable cracking process of regenerated rubber. A controllable cracking process of reclaimed rubber comprises the following steps: 1) crushing waste rubber into rubber fine blocks; 2) adding an activating agent, an anti-aging agent, a catalyst and an auxiliary agent into the rubber fine blocks obtained in the step 1), and mixing; 3) adding the material obtained in the step 2) into a reaction device, preheating, cracking and cooling, and controlling the time of a cracking section to be 2.8-3 min to obtain the catalyst. By adopting special processes and components, the invention can obtain the cracking product with any melt index by adjusting the processes, so that the recycling rate of the waste rubber is improved, and the regenerated rubber has higher tensile strength, thereby effectively relieving the harm of a large amount of waste rubber products to world resources and global ecological environment, turning the harm into the benefit, changing waste into valuable, preventing black pollution and protecting the environment.
Description
Technical Field
The invention relates to the technical field of reprocessing of waste rubber, in particular to a controllable cracking process of regenerated rubber.
Background
In recent years, with the progress of transportation industry, the usage amount of rubber is increasing, and rubber products play more and more important roles in life and production. At the same time, however, the annual rubber production of waste is also increasing in proportion, and nowadays up to 1700 million tons, especially of automobile waste tires, account for about 65% of all waste rubber waste. The junked tires are relatively difficult to degrade or recover due to their size, shape, and stable three-dimensional network structure of the rubber, and in addition, the toxic chemicals within the rubber inhibit the growth of surrounding microorganisms having sulfur oxidizing or degrading capabilities. Therefore, the natural degradation of rubber is a slow process, and if a large amount of waste rubber products cannot be effectively treated, the natural degradation of rubber causes serious harm to world resources and global ecological environment.
At present, the recycling of waste rubber in China is mainly divided into three aspects: the old tire with a better tire body and a more complete structure can be retreaded and reused; for the old tire with bad tire body, the steel wire, the cord thread and the rubber block can be broken and separated, the rubber block is ground into waste rubber powder, and reclaimed rubber serving as a part of raw rubber substitute is prepared; the other application is that the waste rubber powder is used as an organic additive after surface activation modification to be applied to rubber formulations and asphalt, so that the durability of the pavement is improved. Among them, the reclaimed rubber industry is an important way which is most widely applied and most rapidly developed at present.
At present, people generally divide the regeneration of waste rubber into three types of chemical regeneration, physical regeneration and biological regeneration according to different regeneration mechanisms. On the basis of a great deal of research, although certain progress is made, a part of reclaimed rubber is obtained by utilizing waste rubber, and certain industrial application is also obtained, the obtained reclaimed rubber has the problems of unsatisfactory performances such as tensile strength and the like.
Disclosure of Invention
In order to solve the above problems, the first aspect of the present invention provides a controlled cracking process for reclaimed rubber, comprising the steps of:
1) crushing waste rubber into rubber fine blocks;
2) adding an activating agent, an anti-aging agent, a catalyst and an auxiliary agent into the rubber fine blocks obtained in the step 1), and mixing;
3) adding the material obtained in the step 2) into a reaction device, preheating, cracking and cooling, and controlling the time of a cracking section to be 2.8-3 min to obtain the catalyst.
As a preferred technical scheme of the invention, the step 2) comprises the following components in parts by weight: 80-120 parts of rubber fine blocks, 0.6-0.8 part of activating agent, 0.25-0.45 part of anti-aging agent, 0.05-0.08 part of catalyst and 10-15 parts of auxiliary agent.
As a preferable technical scheme of the invention, the activating agent is selected from one or more of alkylphenol disulfide, tetramethyl thiuram disulfide, dibenzothiazyl disulfide, toluene and xylene.
As a preferable technical scheme of the invention, the anti-aging agent is selected from one or more of diphenylamine, p-phenylenediamine, dihydroquinoline, butyl hydroxyanisole, dibutyl hydroxytoluene and propyl gallate.
As a preferable technical scheme of the invention, the catalyst is selected from one or more of alkali metal, alkali metal carbonate, heavy metal salt and Lewis acid.
As a preferable technical scheme of the invention, the catalyst is potassium carbonate and/or boron trifluoride.
According to a preferable technical scheme of the invention, the weight ratio of potassium carbonate to boron trifluoride is (1-3): 1.
as a preferable technical scheme of the invention, the auxiliary agent is selected from one or more of naphthenic oil, engine oil, paraffin oil, white oil, vaseline, low molecular polyolefin wax, diethylene glycol, glycerol, stearic acid and palmitic acid.
As a preferable technical scheme, the temperature of the cracking section is 280-400 ℃, and the rotating speed of a screw is 300-600 rpm.
In a second aspect, the invention provides a reclaimed rubber which is prepared by the above method.
Has the advantages that: the regenerated rubber prepared by the invention adopts special processes and components, so that the inherent problems of difficult control of the thermal cracking process and low product utilization rate are solved, the waste rubber products are efficiently recycled, the harm of a large amount of waste rubber products to world resources and global ecological environment is relieved, the harm is turned into the benefit, the waste is changed into the valuable, the black pollution is prevented and treated, and the environment is protected; on the other hand, under proper process conditions, through the mutual synergistic action of a plurality of components in the system, the three-dimensional network structure of the rubber molecule is loosened and swelled, and a certain amount of free radicals are generated in the system, so that the C-C bond is not damaged as far as possible while the C-S bond and the S-S bond are broken, the regenerated rubber is finally plastic and can be reprocessed, and the regenerated rubber has high tensile strength. In addition, the invention can obtain the cracking product with any melt index by adjusting the process, so that the regenerated rubber has wider application prospect and can greatly reduce the cost.
Detailed Description
The technical features of the technical solutions provided by the present invention are further clearly and completely described below with reference to the specific embodiments, and the scope of protection is not limited thereto. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The words "preferred," "more preferred," "most preferred," and the like in this disclosure mean embodiments of the invention that may, in some instances, provide some benefit. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
In order to solve the above problems, the first aspect of the present invention provides a controlled cracking process for reclaimed rubber, comprising the steps of:
1) crushing waste rubber into rubber fine blocks;
2) adding an activating agent, an anti-aging agent, a catalyst and an auxiliary agent into the rubber fine blocks obtained in the step 1), and mixing;
3) adding the material obtained in the step 2) into a reaction device, preheating, cracking and cooling, and controlling the time of a cracking section to be 2.8-3 min to obtain the catalyst.
In a preferred embodiment, the step 2) comprises the following components in parts by weight: 80-120 parts of rubber fine blocks, 0.6-0.8 part of activating agent, 0.25-0.45 part of anti-aging agent, 0.05-0.08 part of catalyst and 10-15 parts of auxiliary agent.
Step 1)
The waste rubber comprises, but is not limited to, an outer tire, an inner tire, a rubber tube adhesive tape, rubber shoes, industrial sundries, rubber product leftover materials and waste products, a conveying belt, a driving belt, a sealing strip, a sealing ring, a produced rubber strip of a shield door of a railway vehicle, an anti-empty rubber strip, an anti-pinch baffle, a back cover plate telescopic insulating rubber, SMC (sheet molding compound) and DMC (DMC) insulating parts.
The pulverization method of the present invention is not particularly limited as long as the desired rubber fine pieces can be obtained without affecting the object of the present invention, and various pulverization methods conventionally used by those skilled in the art, such as extrusion pulverization, impact pulverization, grinding pulverization, shear pulverization, cleavage pulverization, and the like, can be used.
Step 2)
In a preferred embodiment, the mixing method of the present invention is mechanical stirring, and the rotation speed is 200-400 rpm.
In a preferred embodiment, the mixing time according to the invention is 8 to 17 min.
Activator
The activating agent, also called as a regeneration activating agent, a regenerant or a desulfurizer, refers to a substance which can react with a rubber main chain or a cross-linking bond to restore plasticity of rubber and can be combined with free radicals generated by chain scission of rubber molecules, so that the repolymerization of the rubber after chain scission is prevented, and the effect of accelerating degradation is achieved.
In a preferred embodiment, the activator of the present invention is selected from one or more of alkylphenol disulfide, tetramethylthiuram disulfide, dibenzothiazyl disulfide, toluene, and xylene.
In a more preferred embodiment, the activator of the present invention is an alkylphenol disulfide.
The alkylphenol disulfide is also called as a regeneration activator 420, is a brown resin-like substance, is combustible and low in toxicity, mainly comprises 2,2' -bis (6-tert-butyl-p-cresol) disulfide, is heated to 40 ℃ to form a flowing liquid, is dissolved in gasoline, petroleum ether and chloroform, is slightly dissolved in alcohols and organic solvents, is insoluble in water, is a regeneration activator with excellent performance, and is suitable for regeneration of waste rubber such as natural rubber, styrene butadiene rubber, nitrile butadiene rubber, chloroprene rubber and the like.
In a preferred embodiment, the alkylphenol disulfide of the present invention is commercially available, for example, commercially available alkylphenol disulfide includes, but is not limited to, product number 420 available from red elephant corp, inc.
The inventors of the present application have found that when long rubber molecule chains are cut in high shear or high temperature equipment (such as internal mixers, open mills), these free radicals are unstable and recombine into long chain molecules, and that the alkylphenol disulfide can react with the free radicals generated during the degradation of the rubber network, so that short chain molecules can exist stably, and thus the rubber molecular weight is reduced and the plasticity is increased. On the contrary, if no proper activator is available, the free radicals generated by chain scission can be rapidly recombined to regenerate long-chain molecules, so that the plasticity of the rubber is reduced, and the performance of the regenerated rubber is influenced.
Anti-aging agent
The anti-aging agent is also called antioxidant, and is a substance capable of delaying the aging of a high molecular compound, most of which can inhibit the action of oxygen, and some of which can inhibit the action of heat or light, thereby prolonging the service life of a product. They can be classified into antioxidants, antiozonants and copper inhibitors according to their action, or into antioxidants which change color and do not change color, stain and do not stain, are resistant to heat or flexural aging, and prevent aging such as cracking. Natural antioxidants are present in natural rubber, and other antioxidants are widely used in various rubber products.
In a preferred embodiment, the anti-aging agent is selected from one or more of diphenylamine, p-phenylenediamine, dihydroquinoline, butyl hydroxyanisole, dibutyl hydroxytoluene and propyl gallate.
In a more preferred embodiment, the antioxidant of the present invention is p-phenylenediamine.
The p-phenylenediamine, also called the Wuersi D, is one of the simplest aromatic diamines, is also an intermediate with wide application, can be used for preparing azo dyes and high molecular polymers, can also be used for producing fur coloring agents, rubber anti-aging agents and photo developers, and is also a commonly used sensitive reagent for detecting iron and copper. P-phenylenediamine is an extremely important dye intermediate, and is mainly used for aramid, azo dyes, sulfur dyes, acid dyes and the like.
The p-phenylenediamine anti-aging agents mainly comprise the following components: N-cyclohexyl-N ' -phenyl-p-phenylenediamine (commercially available as antioxidant 4010 or antioxidant CPPD), N-phenyl-N ' -isopropyl-p-phenylenediamine (commercially available as antioxidant 4010NA or antioxidant IPPD), and N-N ' -diphenyl-p-phenylenediamine (commercially available as antioxidant H, antioxidant DPPD or antioxidant PPD).
In a most preferred embodiment, the antioxidant of the present invention is N-cyclohexyl-N' -phenyl-p-phenylenediamine.
The CAS number of the N-cyclohexyl-N' -phenyl-p-phenylenediamine is 101-87-1.
Catalyst
The catalyst of the invention refers to a substance which can change the chemical reaction rate (increase or decrease) of a reactant in a chemical reaction without changing chemical equilibrium, and the mass and chemical properties of the substance are not changed before and after the chemical reaction.
In a preferred embodiment, the catalyst of the present invention is selected from one or more of alkali metal, alkali metal carbonate, heavy metal salt, and lewis acid.
In a preferred embodiment, the catalyst of the present invention is potassium carbonate and/or boron trifluoride.
The potassium carbonate, also known as potash, is a white crystalline powder with a relative molecular weight of 138.21, soluble in water, and an aqueous solution alkaline and insoluble in ethanol, acetone and diethyl ether. The moisture absorption is strong, and the carbon dioxide and the moisture can be absorbed when the film is exposed in the air and converted into the potassium bicarbonate, and the film is sealed and packaged. The hydrate includes monohydrate, dihydrate and trihydrate. The aqueous potassium carbonate solution is alkaline. Insoluble in ethanol and ether.
The boron trifluoride is also called boron fluoride, has molecular weight of 67.81, is an inorganic compound, is colorless gas, and is immediately hydrolyzed in the air when meeting moisture. The fluoroborate ion is a non-coordinating anion and boron trifluoride etherate, in liquid form, is often used in the laboratory as a source of boron trifluoride. Can be prepared by reacting boron trioxide or borate with hydrogen fluoride. High energy fuel for the manufacture of rockets.
In a preferred embodiment, the weight ratio of the potassium carbonate to the boron trifluoride is (1-3): 1.
the inventor in the application finds that, in the thermal cracking process of rubber, under the combined action of components such as an activating agent, a softening agent, a catalyst and the like, the main chain of rubber molecules in a system is broken, a cross-linking structure is damaged, free radical polymerization and other reactions exist simultaneously, and how to balance the reactions, the properties of the regenerated rubber are greatly influenced. The inventor also finds that potassium carbonate as one of alkali metal carbonate catalysts can effectively catalyze the reaction and has high catalytic efficiency, while boron trifluoride as one of lewis acid catalysts has the advantages of short reaction time, proper dosage, low possibility of causing side reaction and equipment corrosion, cost saving and the like, and the potassium carbonate and the boron trifluoride are synergistic with each other to effectively promote the reaction and realize the controllable cracking of the waste rubber.
Assistant (assistant)
The auxiliary agent is also called as a softening agent, and has the functions of swelling rubber, relaxing a network structure and increasing the permeation of oxygen, so that the activation process of the waste rubber powder is accelerated.
In a preferred embodiment, the auxiliary agent of the present invention is selected from one or more of naphthenic oil, engine oil, paraffin oil, white oil, vaseline, low molecular polyolefin wax, diethylene glycol, glycerol, stearic acid, and palmitic acid.
In a more preferred embodiment, the adjuvant of the present invention is a paraffinic oil.
The paraffin oil, also called liquid paraffin or liquid paraffin, is a mineral oil, and is a colorless and odorless mixture obtained from crude oil fractionation, and its main component is C, H. The low-volatility paraffin wax oil has the advantages that the low-volatility paraffin wax oil has less volatile matters and high flash points, provides better weather resistance for processing rubber products and has small volatile matters at high temperature, and the low-volatility paraffin wax oil has excellent performance when being applied to the fields of automobile rubber accessories, outer protective insulating sleeves of wires and cables, household appliance accessories, novel building material sealing and the like. The low aromatic hydrocarbon content, which is particularly important in the application of peroxide vulcanization process, and the paraffin oil with low specific aromatic hydrocarbon content can reduce the consumption of vulcanizing agent, thereby reducing the cost. The low aromatic hydrocarbon content and the low volatility of the paraffin oil are matched to play a significant role in the application of EPDM rubber in automobile door and window sealing strips, gaskets and automobile flexible rubber tubes, the low aromatic hydrocarbon content improves the anti-oxidative degradation performance of rubber, the low volatility is favorable for preventing aging shrinkage, and the poor appearance (such as roughness and bubbles) of a product is favorably improved, and the two characteristics are favorable for prolonging the service life of the rubber product.
In a preferred embodiment, the paraffinic oil of the present invention is commercially available, for example, commercially available paraffinic oils include, but are not limited to, the 2-150# products available from Jiangsu Asahi chemical Limited.
The inventor in the application finds that in the thermal cracking process, paraffin oil can relax and swell the three-dimensional network structure of rubber, so that permeation channels are opened in the system; and then through the combined action of the components such as an activating agent, a catalyst and the like, physical and chemical reactions are simultaneously carried out, so that the reticular macromolecular structure of the rubber is oxidized, desulfurized and degraded, S-S bonds are removed, a certain amount of active free radicals are generated at the same time, and the reticular macromolecular structure of the rubber is changed into a large amount of small reticular structures and a small amount of linear chain structures.
Step 3)
In a preferred embodiment, the temperature of the preheating section is 180-250 ℃, the screw rotation speed is 50-70 rpm, and the time is 0.7-1 min.
In a preferred embodiment, the temperature of the cracking section is 280-400 ℃, and the rotating speed of a screw is 300-600 rpm.
In a preferred embodiment, the temperature of the cooling section is 100-160 ℃, the screw rotation speed is 20-90 rpm, and the time is 0.7-1 min.
Softening and compressing the material obtained in the step 2) through a preheating section; then cracking is carried out; then the cracked materials are transported to a cooling section for oxygen insulation and temperature reduction, and the regenerated rubber is prevented from being oxidized.
The inventor in the application finds that potassium carbonate and boron trifluoride are selected as catalysts, and the weight ratio of the potassium carbonate to the boron trifluoride is controlled to be (1-3): 1, and simultaneously, when the time of the cracking section is controlled to be 2.8-3 min, the tensile strength of the regenerated rubber can be improved. Probably because the potassium carbonate and the boron trifluoride molecules have proper catalytic activity in a certain cracking time, under the condition of a specific proportion, the potassium carbonate and the boron trifluoride generate relaxation and swelling of a three-dimensional network structure of rubber molecules through the mutual synergistic action, and the combined action of a catalytic activator and a softener, and a certain amount of free radicals are generated in a system, so that the C-C bonds are not damaged as far as possible while the C-S bonds and the S-S bonds are broken, the rubber is finally made into the regenerated rubber which has plasticity and can be reprocessed, and the regenerated rubber has higher tensile strength.
In a second aspect, the invention provides a reclaimed rubber which is prepared by the above method.
The present invention will now be described in detail by way of examples, and the starting materials used are commercially available unless otherwise specified.
Examples
Example 1
Embodiment 1 provides a controlled cracking process for reclaimed rubber, comprising the steps of:
1) crushing waste rubber tires into rubber fine blocks;
2) adding an activating agent, an anti-aging agent, a catalyst and an auxiliary agent into the rubber fine blocks obtained in the step 1), and mixing;
3) adding the material obtained in the step 2) into a reaction device, preheating, cracking and cooling, and controlling the time of a cracking section to be 3min to obtain the catalyst.
In the step 2), the composition comprises the following components in parts by weight: 100 parts of rubber fine blocks, 0.7 part of activating agent, 0.35 part of anti-aging agent, 0.6 part of catalyst and 13 parts of auxiliary agent.
The activating agent is alkylphenol disulfide.
The purchasing merchant of the alkylphenol disulfide is red elephant trade company Limited in Laiwu, and the model is 420.
The anti-aging agent is N-cyclohexyl-N' -phenyl-p-phenylenediamine, and the CAS number is 101-87-1.
The catalyst is potassium carbonate and boron trifluoride.
The weight ratio of the potassium carbonate to the boron trifluoride is 2: 1.
the auxiliary agent is paraffin oil.
The purchase merchant of the paraffin oil is Jiangsu Zhengxu chemical industry Co., Ltd, and the model is 2-150 #.
The mixing mode of the step 2) is mechanical stirring, and the rotating speed is 300 rpm.
The mixing time in step 2) is 12 min.
The temperature of the preheating section in the step 3) is 210 ℃, the rotating speed of a screw is 60rpm, and the time is 1 min.
The temperature of the cracking section in the step 3) is 340 ℃, and the rotating speed of a screw is 450 rpm.
And 3) the temperature of the cooling section in the step 3) is 130 ℃, the rotating speed of a screw is 50rpm, and the time is 1 min.
Example 1 also provides a reclaimed rubber.
Example 2
Embodiment 2 provides a controlled cracking process for reclaimed rubber, comprising the steps of:
1) crushing waste rubber tires into rubber fine blocks;
2) adding an activating agent, an anti-aging agent, a catalyst and an auxiliary agent into the rubber fine blocks obtained in the step 1), and mixing;
3) adding the material obtained in the step 2) into a reaction device, preheating, cracking and cooling, and controlling the time of a cracking section to be 2.8min to obtain the catalyst.
In the step 2), the composition comprises the following components in parts by weight: 80 parts of rubber fine blocks, 0.6 part of activating agent, 0.25 part of anti-aging agent, 0.05 part of catalyst and 10 parts of auxiliary agent.
The activating agent is alkylphenol disulfide.
The purchasing merchant of the alkylphenol disulfide is red elephant trade company Limited in Laiwu, and the model is 420.
The anti-aging agent is N-cyclohexyl-N' -phenyl-p-phenylenediamine, and the CAS number is 101-87-1.
The catalyst is potassium carbonate and boron trifluoride.
The weight ratio of the potassium carbonate to the boron trifluoride is 2: 1.
the auxiliary agent is paraffin oil.
The purchase merchant of the paraffin oil is Jiangsu Zhengxu chemical industry Co., Ltd, and the model is 2-150 #.
The mixing mode of the step 2) is mechanical stirring, and the rotating speed is 200 rpm.
The mixing time in step 2) is 8 min.
The temperature of the preheating section in the step 3) is 180 ℃, the rotating speed of a screw is 50rpm, and the time is 0.7 min.
The temperature of the cracking section in the step 3) is 280 ℃, and the rotating speed of a screw is 300 rpm.
And 3) the temperature of the cooling section in the step 3) is 100 ℃, the rotating speed of the screw is 20rpm, and the time is 0.7 min.
Example 2 also provides a reclaimed rubber.
Example 3
Embodiment 3 provides a controlled cracking process for reclaimed rubber, comprising the steps of:
1) crushing waste rubber tires into rubber fine blocks;
2) adding an activating agent, an anti-aging agent, a catalyst and an auxiliary agent into the rubber fine blocks obtained in the step 1), and mixing;
3) adding the material obtained in the step 2) into a reaction device, preheating, cracking and cooling, and controlling the time of a cracking section to be 3min to obtain the catalyst.
In the step 2), the composition comprises the following components in parts by weight: 120 parts of rubber fine blocks, 0.8 part of activating agent, 0.45 part of anti-aging agent, 0.08 part of catalyst and 15 parts of auxiliary agent.
The activating agent is alkylphenol disulfide.
The purchasing merchant of the alkylphenol disulfide is red elephant trade company Limited in Laiwu, and the model is 420.
The anti-aging agent is N-cyclohexyl-N' -phenyl-p-phenylenediamine, and the CAS number is 101-87-1.
The catalyst is potassium carbonate and boron trifluoride.
The weight ratio of the potassium carbonate to the boron trifluoride is 2: 1.
the auxiliary agent is paraffin oil.
The purchase merchant of the paraffin oil is Jiangsu Zhengxu chemical industry Co., Ltd, and the model is 2-150 #.
The mixing mode of the step 2) is mechanical stirring, and the rotating speed is 400 rpm.
The mixing time in step 2) was 17 min.
And 3) the temperature of the preheating section in the step 3) is 250 ℃, the rotating speed of the screw is 70rpm, and the time is 1 min.
The temperature of the cracking section in the step 3) is 400 ℃, and the rotating speed of a screw is 600 rpm.
And 3) the temperature of the cooling section in the step 3) is 160 ℃, the rotating speed of the screw is 90rpm, and the time is 1 min.
Example 3 also provides a reclaimed rubber.
Example 4
Example 4 provides a controlled cracking process for a reclaimed rubber, and also provides a reclaimed rubber, the specific implementation manner of which is the same as that of example 1, except that the cracking time is replaced by 1 min.
Example 5
Example 5 provides a controlled cracking process for reclaimed rubber and also provides a reclaimed rubber, the specific implementation manner is the same as example 1, except that the cracking time is replaced by 15 min.
Example 6
Example 6 provides a controlled cracking process for reclaimed rubber and also provides reclaimed rubber, the specific embodiment of which is the same as example 1, except that the weight ratio of potassium carbonate to boron trifluoride is replaced by 1: 3.
example 7
Example 7 provides a controlled cracking process for reclaimed rubber and also provides reclaimed rubber, the specific embodiment of which is the same as example 1, except that the weight ratio of potassium carbonate to boron trifluoride is replaced by 5: 1.
example 8
Example 8 provides a controlled cracking process for reclaimed rubber and also provides reclaimed rubber, the specific embodiment of which is the same as example 1, except that the amount of potassium carbonate is replaced by 0.
Example 9
Example 9 provides a controlled cracking process for reclaimed rubber and a reclaimed rubber, the specific embodiment of which is the same as example 1 except that the amount of boron trifluoride used is replaced with 0.
Evaluation of Performance
1. Tensile strength: the tensile strength of the samples before and after splitting was measured in MPa in reference to GB528-82 determination of tensile Properties of vulcanized rubber and thermoplastic rubber.
Table 1 characterization of performance tests
As can be seen from Table 1, the reclaimed rubber of the present invention has a higher tensile strength, and meets the requirements of industrial production.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. A controllable cracking process of reclaimed rubber is characterized by comprising the following steps:
1) crushing waste rubber into rubber fine blocks;
2) adding an activating agent, an anti-aging agent, a catalyst and an auxiliary agent into the rubber fine blocks obtained in the step 1), and mixing;
3) adding the material obtained in the step 2) into a reaction device, preheating, cracking and cooling, and controlling the time of a cracking section to be 2.8-3 min to obtain the catalyst.
2. The controlled cracking process of the reclaimed rubber according to claim 1, wherein the step 2) comprises the following components in parts by weight: 80-120 parts of rubber fine blocks, 0.6-0.8 part of activating agent, 0.25-0.45 part of anti-aging agent, 0.05-0.08 part of catalyst and 10-15 parts of auxiliary agent.
3. The process for controlled cracking of reclaimed rubber according to claim 1 or 2, wherein the activating agent is one or more selected from alkylphenol disulfide, tetramethylthiuram disulfide, dibenzothiazyl disulfide, toluene, and xylene.
4. The controllable cracking process of the regenerated rubber according to claim 1 or 2, characterized in that the anti-aging agent is one or more selected from diphenylamine, p-phenylenediamine, dihydroquinoline, butylhydroxyanisole, dibutylhydroxytoluene, and propyl gallate.
5. The process of claim 1 or 2, wherein the catalyst is selected from one or more of alkali metal, alkali metal carbonate, heavy metal salt, and Lewis acid.
6. A process for controlled cracking of reclaimed rubber according to claim 5, wherein the catalyst is potassium carbonate and/or boron trifluoride.
7. The controlled cracking process of the reclaimed rubber according to claim 6, wherein the weight ratio of the potassium carbonate to the boron trifluoride is (1-3): 1.
8. the process for controlled cracking of reclaimed rubber according to claim 1 or 2, wherein the auxiliary agent is one or more selected from naphthenic oil, engine oil, paraffin oil, white oil, vaseline, low molecular weight polyolefin wax, diethylene glycol, glycerol, stearic acid, and palmitic acid.
9. The controllable cracking process of the reclaimed rubber according to claim 1, wherein the temperature of the cracking section is 280-400 ℃, and the screw rotation speed is 300-600 rpm.
10. A reclaimed rubber prepared by the controlled cracking process according to any one of claims 1 to 9.
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