CN116394428A - Process method for producing tread regenerated rubber - Google Patents
Process method for producing tread regenerated rubber Download PDFInfo
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- CN116394428A CN116394428A CN202310428957.5A CN202310428957A CN116394428A CN 116394428 A CN116394428 A CN 116394428A CN 202310428957 A CN202310428957 A CN 202310428957A CN 116394428 A CN116394428 A CN 116394428A
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- rubber
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- cooling
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 45
- 239000002699 waste material Substances 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 17
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 16
- 230000023556 desulfurization Effects 0.000 claims abstract description 16
- 238000005520 cutting process Methods 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000007670 refining Methods 0.000 claims abstract description 7
- 238000007873 sieving Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 238000010298 pulverizing process Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 13
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 12
- 230000003009 desulfurizing effect Effects 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000012190 activator Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 235000021355 Stearic acid Nutrition 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 6
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 6
- 239000008117 stearic acid Substances 0.000 claims description 6
- 239000011787 zinc oxide Substances 0.000 claims description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 125000003118 aryl group Chemical group 0.000 claims description 3
- 239000006229 carbon black Substances 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 229910000464 lead oxide Inorganic materials 0.000 claims description 3
- 238000007885 magnetic separation Methods 0.000 claims description 3
- IUJLOAKJZQBENM-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)-2-methylpropan-2-amine Chemical compound C1=CC=C2SC(SNC(C)(C)C)=NC2=C1 IUJLOAKJZQBENM-UHFFFAOYSA-N 0.000 claims description 3
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000004260 weight control Methods 0.000 claims description 3
- 239000005864 Sulphur Substances 0.000 claims 1
- 239000003344 environmental pollutant Substances 0.000 abstract description 6
- 231100000719 pollutant Toxicity 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 4
- 230000000704 physical effect Effects 0.000 abstract description 3
- 230000008929 regeneration Effects 0.000 abstract description 2
- 238000011069 regeneration method Methods 0.000 abstract description 2
- 238000010008 shearing Methods 0.000 abstract 1
- 238000004132 cross linking Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010092 rubber production Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
Classifications
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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
- C08J11/12—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 dry-heat treatment only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B2017/001—Pretreating the materials before recovery
- B29B2017/0015—Washing, rinsing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B2017/001—Pretreating the materials before recovery
- B29B2017/0021—Dividing in large parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0217—Mechanical separating techniques; devices therefor
- B29B2017/0231—Centrifugating, cyclones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0268—Separation of metals
- B29B2017/0272—Magnetic separation
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/06—Sulfur
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/45—Heterocyclic compounds having sulfur in the ring
- C08K5/46—Heterocyclic compounds having sulfur in the ring with oxygen or nitrogen in the ring
- C08K5/47—Thiazoles
-
- 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
Abstract
The invention provides a process method for producing tread regenerated rubber, and relates to the field of waste rubber regeneration. The process method for producing the tread regenerated rubber comprises the following steps: classifying, shearing and cleaning the waste rubber tread, and step two: putting the mixture into a pulverizer to separate impurities after pulverizing, and step three: sieving the rubber powder, and a fourth step: adding a cross-linking agent into the rubber powder and uniformly mixing, and step five: putting the gel powder into a desulfurization tank for desulfurization to obtain a reclaimed rubber blank, and step six: cooling the reclaimed rubber blank, and step seven: refining the reclaimed rubber blank, and then cutting to obtain a reclaimed rubber finished product. According to the invention, the waste rubber tread is crushed and mixed in a low-temperature state, so that the rubber powder is easier to crystallize in a natural state due to a flat plane and a linear fragile structure, thereby maintaining the chemical property of the reclaimed rubber, and meanwhile, the cross-linking agent is added into the rubber powder, so that the original rubber has extremely high physical properties, a large amount of pollutants and malodor are not generated, and the reclaimed rubber is safer to use.
Description
Technical Field
The invention relates to the field of waste rubber regeneration, in particular to a process method for producing tread regenerated rubber.
Background
The method is a country with large rubber consumption but quite deficient rubber resources, and about half of annual consumption needs to be imported, so that the treatment and reuse of the waste tires are important for environmental protection. Due to economic pressure and environmental protection, the development of various methods for recycling the junked tires is promoted.
The traditional regenerated rubber production is developed into a high-temperature dynamic desulfurization method, a normal-temperature machine desulfurization method and an infrared desulfurization method after passing through a water method, an oil method and a water-oil method, and the most common method is the high-temperature dynamic desulfurization method, so that pollutants such as non-methane total hydrocarbon and the like can be generated in the desulfurization process, the pollutants are difficult to treat, bad smell can be generated, the physical and mental health of consumers can be influenced, the chemical property of the rubber can be reduced after the processing is finished, the normal use is influenced, the processing efficiency is low, and the modern processing requirements are difficult to meet.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a process method for producing tread reclaimed rubber, which solves the problems that pollutants such as non-methane total hydrocarbon and the like are difficult to treat and bad smell is generated in the desulfurization process.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a process for producing tread reclaimed rubber comprising the steps of:
step one: sorting, namely sorting waste rubber treads, cutting the waste rubber treads into fixed sizes, and then putting the waste rubber treads into clear water for cleaning;
step two: crushing, namely putting the cleaned rubber into a crusher to be crushed, and then sequentially sending the crushed rubber into a cyclone separator and a magnetic separation device to separate impurities in the crushed rubber to obtain rubber powder;
step three: sieving, sieving the rubber powder with a 40-60 mesh sieve, collecting unqualified rubber powder independently, pulverizing again, and removing a small amount of impurities in the rubber powder;
step four: mixing, namely adding a cross-linking agent into the rubber powder, and uniformly mixing the mixture by using a stirrer to obtain gel powder;
step five: desulfurizing, namely placing gel powder into a desulfurizing tank, adding a softener, an activator and deionized water, and heating and pressurizing the desulfurizing tank to obtain a reclaimed rubber blank;
step six: cooling, namely uniformly spreading the reclaimed rubber blank on a cooling field, and cooling the reclaimed rubber blank by adopting a mode of cooling the cooling field by cooling water in a jacket;
step seven: and (3) refining, namely placing the cooled reclaimed rubber blank into a refiner for refining to obtain a rubber sheet, and then cutting off the rubber sheet by an automatic cutting knife through weight control of the rubber sheet to obtain a reclaimed rubber finished product.
Preferably, in the second step, the crushing temperature is 5-10 ℃, the rotating speed of the crusher is 1000-1200r/min, the crushing time is 30-40min, the particles generated in the crushing are collected by a gas collecting hood, the particles are dedusted by a bag type dust remover, the dust remover is cleaned, and the collected waste rubber particles are recycled.
Preferably, the cross-linking agent in the fourth step is prepared from carbon black, zinc oxide, stearic acid, TBBS and sulfur according to the weight ratio of 45:5:2:0.7:2.5, the cross-linking agent and the rubber powder are mixed and prepared, wherein the mass ratio of the cross-linking agent to the rubber powder is 1:3.5.
preferably, in the fourth step, the stirring speed of the stirrer is 400-600r/min, the stirring time is 15-20min, and the stirring temperature is 8-10 ℃.
Preferably, the softener in the fifth step is one or more of a fatty acid softener, an aromatic sulfate softener, a phenolic resin softener and a polyurethane softener, and the activator is one of stearic acid, zinc oxide or lead oxide.
Preferably, in the fifth step, the mass ratio of the gel powder to the softener to the activator to the deionized water is 100:7:4:80, wherein the heating temperature of the desulfurization tank is 170-190 ℃, the heating time is 1.5-2.5h, and the pressure of the desulfurization tank is 20-25Mpa.
Preferably, the cooling time in the step six is 3-5h, and the cooling temperature is 30-40 ℃.
The invention provides a process method for producing tread reclaimed rubber. The beneficial effects are as follows:
1. according to the invention, the waste rubber tread is crushed and mixed in a low-temperature state, so that the rubber powder is easier to crystallize in a natural state due to a flat plane and a linear fragile structure, the chemical property of reclaimed rubber is maintained, the efficiency of the later desulfurization process is higher, and the production efficiency is improved.
2. According to the invention, the cross-linking agent is added into rubber powder before desulfurization, and uniformly coated on the surface of waste rubber powder particles through stirring, and the cross-linking agent permeates into the rubber powder particles through infiltration, so that the bond energy of S-S cross-linking bonds is reduced, the S-S cross-linking bonds can be effectively unbuckled in a short time, and S-C bonds and C-C bonds are not damaged, so that the waste rubber powder is recovered to be active, converted into a plastic-like recovery state, and the original rubber is kept extremely high in physical property, and a large amount of pollutants and malodor are not generated compared with a traditional vulcanization system, so that the reclaimed rubber is safer to use.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
the embodiment of the invention provides a process method for producing tread reclaimed rubber, which comprises the following steps:
step one: sorting, namely sorting waste rubber treads, cutting the waste rubber treads into fixed sizes, and then putting the waste rubber treads into clear water for cleaning;
step two: crushing, namely putting the cleaned rubber into a crusher to be crushed, and then sequentially sending the crushed rubber into a cyclone separator and a magnetic separation device to separate impurities in the crushed rubber to obtain rubber powder;
step three: sieving, sieving the rubber powder with a 40-60 mesh sieve, collecting unqualified rubber powder independently, pulverizing again, and removing a small amount of impurities in the rubber powder;
step four: mixing, namely adding a cross-linking agent into the rubber powder, and uniformly mixing the mixture by using a stirrer to obtain gel powder;
step five: desulfurizing, namely placing gel powder into a desulfurizing tank, adding a softener, an activator and deionized water, and heating and pressurizing the desulfurizing tank to obtain a reclaimed rubber blank;
step six: cooling, namely uniformly spreading the reclaimed rubber blank on a cooling field, and cooling the reclaimed rubber blank by adopting a mode of cooling the cooling field by cooling water in a jacket;
step seven: and (3) refining, namely placing the cooled reclaimed rubber blank into a refiner for refining to obtain a rubber sheet, and then cutting off the rubber sheet by an automatic cutting knife through weight control of the rubber sheet to obtain a reclaimed rubber finished product.
In the embodiment, the crushing temperature in the second step is 5-10 ℃, the rotating speed of the crusher is 1000-1200r/min, the crushing time is 30-40min, the particles generated in the crushing are collected by a gas collecting hood, the particles are dedusted by a bag type dust remover, the dust remover is cleaned, and the collected waste rubber particles are recycled.
Further, in the fourth step, the cross-linking agent is prepared from carbon black, zinc oxide, stearic acid, TBBS and sulfur according to the weight ratio of 45:5:2:0.7:2.5, the cross-linking agent and the rubber powder are mixed and prepared according to the mass ratio of 1:3.5.
specifically, the cross-linking agent is added into rubber powder before desulfurization, and uniformly coated on the surface of waste rubber powder particles through stirring, and the cross-linking agent permeates into the rubber powder particles through infiltration, so that the bond energy of S-S cross-linking bonds is reduced, the S-S cross-linking bonds can be effectively unbuckled in a short time without damaging S-C bonds and C-C bonds, the waste rubber powder is recovered to be active, the waste rubber powder is converted into a plastic-like recovery state, and the original rubber is kept extremely high in physical property, so that a large amount of pollutants and malodor are not generated compared with a traditional vulcanization system, and the reclaimed rubber is safer to use.
Further, in the fourth step, the stirring speed of the stirrer is 400-600r/min, the stirring time is 15-20min, and the stirring temperature is 8-10 ℃.
Specifically, the waste rubber tread is crushed and mixed in a low-temperature state, so that the rubber powder is easier to crystallize in a natural state due to a flat plane and a linear fragile structure, the chemical property of reclaimed rubber is maintained, the efficiency of the later desulfurization process is higher, and the production efficiency is improved.
Further, in the fifth step, the softener is one or more of a fatty acid softener, an aromatic sulfate softener, a phenolic resin softener and a polyurethane softener, and the activator is one of stearic acid, zinc oxide or lead oxide.
Further, in the fifth step, the mass ratio of the gel powder to the softener to the activator to the deionized water is 100:7:4:80, the heating temperature of the desulfurizing tank is 170-190 ℃, the heating time is 1.5-2.5h, and the pressure of the desulfurizing tank is 20-25Mpa.
Further, the cooling time in the step six is 3-5h, and the cooling temperature is 30-40 ℃.
Experimental example
The reclaimed rubber finished product prepared in the embodiment is subjected to performance test, wherein test items comprise tensile strength, elongation at break and Mooney viscosity, and the following table is obtained.
| Inspection item | Standard (TA) 2 ) | Test results |
| Tensile Strength/Mpa | ≥12.0 | 17.2 |
| Elongation at break/% | ≥400 | 495 |
| Mooney viscosity/ML 100 ℃ (1+4) | ≤95 | 68 |
As shown in the table above, the reclaimed rubber prepared in this example all reached the national standard.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A process for producing tread reclaimed rubber, comprising the steps of:
step one: sorting, namely sorting waste rubber treads, cutting the waste rubber treads into fixed sizes, and then putting the waste rubber treads into clear water for cleaning;
step two: crushing, namely putting the cleaned rubber into a crusher to be crushed, and then sequentially sending the crushed rubber into a cyclone separator and a magnetic separation device to separate impurities in the crushed rubber to obtain rubber powder;
step three: sieving, sieving the rubber powder with a 40-60 mesh sieve, collecting unqualified rubber powder independently, pulverizing again, and removing a small amount of impurities in the rubber powder;
step four: mixing, namely adding a cross-linking agent into the rubber powder, and uniformly mixing the mixture by using a stirrer to obtain gel powder;
step five: desulfurizing, namely placing gel powder into a desulfurizing tank, adding a softener, an activator and deionized water, and heating and pressurizing the desulfurizing tank to obtain a reclaimed rubber blank;
step six: cooling, namely uniformly spreading the reclaimed rubber blank on a cooling field, and cooling the reclaimed rubber blank by adopting a mode of cooling the cooling field by cooling water in a jacket;
step seven: and (3) refining, namely placing the cooled reclaimed rubber blank into a refiner for refining to obtain a rubber sheet, and then cutting off the rubber sheet by an automatic cutting knife through weight control of the rubber sheet to obtain a reclaimed rubber finished product.
2. The process for producing tread reclaimed rubber according to claim 1, wherein in the second step, the crushing temperature is 5-10 ℃, the rotation speed of the crusher is 1000-1200r/min, the crushing time is 30-40min, the particles produced in the crushing are collected by a gas collecting hood, the particles are removed by a bag type dust remover, and the dust remover is cleaned, so that the collected waste rubber particles are reused.
3. A process for producing a tread reclaimed rubber as claimed in claim 1 wherein the cross-linking agent in step four is formed by carbon black, zinc oxide, stearic acid, TBBS and sulphur in a weight ratio of 45:5:2:0.7:2.5, the cross-linking agent and the rubber powder are mixed and prepared, wherein the mass ratio of the cross-linking agent to the rubber powder is 1:3.5.
4. a process for producing a tread reclaimed rubber as claimed in claim 1, wherein the stirring speed of the stirrer in the fourth step is 400-600r/min, the stirring time is 15-20min, and the stirring temperature is 8-10 ℃.
5. A process for producing a tread reclaimed rubber as claimed in claim 1 wherein the softener in step five is one or more of a fatty acid softener, an aromatic sulfate softener, a phenolic resin softener and a polyurethane softener, and the activator is one of stearic acid, zinc oxide or lead oxide.
6. A process for producing a tread reclaimed rubber as claimed in claim 1, wherein the mass ratio of the gel powder, the softener, the activator and the deionized water in the fifth step is 100:7:4:80, wherein the heating temperature of the desulfurization tank is 170-190 ℃, the heating time is 1.5-2.5h, and the pressure of the desulfurization tank is 20-25Mpa.
7. A process for producing a tread reclaimed rubber as claimed in claim 1 wherein the cooling time in step six is 3 to 5 hours and the cooling temperature is 30 ℃ to 40 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310428957.5A CN116394428A (en) | 2023-04-20 | 2023-04-20 | Process method for producing tread regenerated rubber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310428957.5A CN116394428A (en) | 2023-04-20 | 2023-04-20 | Process method for producing tread regenerated rubber |
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| CN116394428A true CN116394428A (en) | 2023-07-07 |
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| CN202310428957.5A Pending CN116394428A (en) | 2023-04-20 | 2023-04-20 | Process method for producing tread regenerated rubber |
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| CN (1) | CN116394428A (en) |
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- 2023-04-20 CN CN202310428957.5A patent/CN116394428A/en active Pending
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