CN110698776A - Preparation method of high-strength tire curing bladder - Google Patents
Preparation method of high-strength tire curing bladder Download PDFInfo
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- CN110698776A CN110698776A CN201911293041.3A CN201911293041A CN110698776A CN 110698776 A CN110698776 A CN 110698776A CN 201911293041 A CN201911293041 A CN 201911293041A CN 110698776 A CN110698776 A CN 110698776A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
- C08L23/22—Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
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- 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
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7461—Combinations of dissimilar mixers
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- 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
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
- B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/18—Polymers of hydrocarbons having four or more carbon atoms, e.g. polymers of butylene, e.g. PB, i.e. polybutylene
- B29K2023/22—Copolymers of isobutene, e.g. butyl rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/757—Moulds, cores, dies
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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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
- C08K3/18—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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/18—Spheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2312/00—Crosslinking
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Abstract
The invention provides a preparation method of a high-strength tire curing bladder, and relates to the technical field of tire curing bladder production and processing. In the tire curing bladder component, the green rubber comprises: butyl rubber and brominated butyl rubber; the filler comprises: carbon black, acetylene black, graphite, and aluminum oxide; the active agent is zinc oxide master batch particles; the processing aid comprises: stearic acid, paraffin wax; the vulcanizing agent comprises a vulcanizing resin and sulfur; the unsaturation degree of the butyl rubber is 0.5-2%, and bromine in the brominated butyl rubber is 1.5-2.5%; the rubber sheet is processed by three-stage rubber mixing, and then the tire vulcanization capsule is obtained by injection vulcanization. Compared with the prior art, the invention has the advantages that: the butyl rubber and the brominated butyl rubber are used as raw rubber, the rubber extruder is used as three sections of rubber mixing equipment, the high-temperature mixing time is shortened, the stability of the brominated butyl rubber is kept, the purpose of uniform mixing is achieved, the strength is improved, and the vulcanization time can be shortened.
Description
Technical Field
The invention relates to the technical field of tire curing bladder production and processing, in particular to a preparation method of a high-strength tire curing bladder.
Background
The tire vulcanization capsule is a hollow thin-wall rubber product, and is installed inside a tire vulcanizer to be used as an inner mold for tire shaping in the tire vulcanization molding process. Media such as superheated water or compressed air are filled into the tire curing bladder, so that the tire curing bladder stretches to support the tire rubber blank, the tire rubber blank is attached to the tire inner liner, the temperature is kept relatively balanced in the tire curing process by utilizing the flowing heat transfer characteristic of the media fluid in the tire curing bladder, the effect of uniform tire curing is achieved, and the balance performance of the tire is improved.
The tire curing bladder is used by filling a heat medium and needs to have good air tightness, so that butyl rubber is usually used as a base rubber material; the air tightness of the butyl rubber is related to the degree of unsaturation of the butyl rubber, and generally, the lower the degree of unsaturation, the better the air tightness; the unsaturation degree is low, and the aging resistance is excellent; however, low unsaturation, poor processability, slow cure rate, low elasticity, are detrimental to the production and repeated use of tire curing bladders. Because the tire curing bladder has more characteristics, the research on the preparation process of the tire curing bladder is continuously carried out.
CN105647038B discloses a method for preparing a high-strength tire curing bladder, which comprises the following steps: step 1, modifying chlorinated butyl rubber: step 2, taking the modified chlorinated butyl rubber, the natural rubber, the N330 carbon black, the N660 carbon black, the sulfur, the zinc oxide, the vulcanized resin, the stearic acid, the vulcanized cottonseed oil, the nano silicon dioxide and the stannous chloride in parts by weight, putting the mixture into an open mill for mixing at the mixing temperature of 90-95 ℃ for 20-30min, and extruding the rubber sheet by an extruder after the mixing is finished; and step 3, an injection vulcanization process, wherein the vulcanization time is 46-55 min. The technical solution in this patent improves the strength, but the processing time is long.
Disclosure of Invention
The invention provides a preparation method of a high-strength tire curing bladder, which is improved from the aspects of raw materials, formula design, production process and the like to manufacture the high-strength tire curing bladder.
A component of a tire curing bladder comprising: raw rubber, a filler, an active agent, a processing aid and a vulcanizing agent. The specific technical scheme is that in the tire curing bladder component, the raw rubber comprises: butyl rubber and brominated butyl rubber; the filler comprises: carbon black, acetylene black, graphite, and aluminum oxide; the active agent is zinc oxide master batch particles; the processing aid comprises: stearic acid, paraffin wax; the vulcanizing agent comprises a vulcanizing resin and sulfur;
the unsaturation degree of the butyl rubber is 0.5-2%, and bromine in the brominated butyl rubber is 1.5-2.5%.
The preparation steps are as follows:
s1, weighing the materials according to the formula, wherein the weight parts are as follows: 100 parts of raw rubber, 30-60 parts of filler, 3-5 parts of activator, 3-5 parts of processing aid and 2-6 parts of vulcanizing agent;
s2, processing the film
S21, mixing rubber: adding the raw rubber, 1/2 filler, activator and processing aid into an internal mixer, carrying out internal mixing at 90-110 ℃ for 1-10min, and discharging the internal mixed rubber material;
s22, secondary rubber mixing: adding the banburying rubber material in the S21 into an open mill, simultaneously adding the rest 1/2 filler, and mixing for 5-10min at the temperature of 100 ℃ and 120 ℃; adding a vulcanizing agent, mixing for 2-5min, and discharging mixed rubber;
s23, three-stage rubber mixing: heating the cylinder temperature of a rubber extruder to 50-55 ℃, the head temperature to 60-65 ℃ and the extrusion port temperature to 70-75 ℃, preserving heat, feeding the mixed rubber material in S22 into the feeding port of the extruder, starting an extrusion screw, controlling the extrusion pressure to be 10-12MPa, extruding the capsule rubber material to the head from the cylinder by the extrusion screw, and finally extruding the sheet rubber material from the extrusion port, wherein the sheet extrusion speed of the sheet rubber material is controlled to be 2.5-3 m/min;
s24, hanging the flaky rubber material on a material rack and naturally cooling to room temperature;
s3, injection vulcanization: placing the film obtained in the step S24 into an injection vulcanizing machine, controlling the temperature of a screw at 70-80 ℃ and controlling the pressure at 16-18 MPa; the injection vulcanization temperature is 180 ℃ and 200 ℃, and the vulcanization time is 30-42 min; and after vulcanization, the injection vulcanizing machine ejects the tire bladder out of the mold cavity, and the high-strength tire vulcanizing bladder is prepared.
Furthermore, the butyl rubber accounts for 60-80% of the crude rubber, and the brominated butyl rubber accounts for 20-40% of the crude rubber. The brominated butyl rubber is mainly used for modifying the butyl rubber, the brominated butyl rubber has good cohesiveness with unsaturated parts of the butyl rubber, and the proportion is related to the unsaturation degree of the butyl rubber and the bromine content of the brominated butyl rubber.
Furthermore, in the filling agent, the mixture ratio of the carbon black, the acetylene black, the graphite and the aluminum oxide is (1-2): (2-4): (1-2):1.
Further, in the processing aid, the ratio of stearic acid to paraffin is 1: (1-2).
Further, in the vulcanizing agent, the ratio of the vulcanized resin to the sulfur is (1-3): 1.
butyl rubber and brominated butyl rubber are used as raw rubber, and the brominated butyl rubber accounts for 20-40% of the raw rubber. Research shows that the brominated butyl rubber is superior to butyl rubber in heat resistance and self-adhesion, and can be used for modifying the butyl rubber. Brominated butyl rubber has a stronger reactivity at the solid cure sites in the polymer chain than chlorinated butyl rubber, and therefore exhibits a stronger adhesion to the unsaturated portions of butyl rubber and a faster cure rate than chlorinated butyl rubber. The cure time for brominated butyl rubber is half that for chlorinated butyl rubber for the same thickness of rubber article. Brominated butyl rubber is comparable to chlorinated butyl rubber in air impermeability, heat resistance and strength.
The zinc oxide master colloidal particles can effectively solve the problems of inaccurate measurement of zinc oxide and uneven dispersion in raw rubber; to improve processed film uniformity. The zinc oxide master batch used in the invention comprises the following specific preparation steps: firstly, putting carrier rubber and zinc stearate into an open mill according to a proportion, and plasticating uniformly; then putting the product, zinc oxide powder and naphthenic base mineral oil into an internal mixer according to the proportion, and mixing and internally mixing; and finally, feeding the materials obtained by mixing and banburying into a conveying hopper, conveying the materials to a conical double-screw forced kneading machine, kneading, conveying the materials to a single-screw cold-feeding extruder, and granulating and discharging.
In the production process, three sections of rubber mixing are carried out to process rubber sheets; the solid vulcanization point on the polymer chain of the brominated butyl rubber has stronger reactivity, and the temperature in banburying and open mixing is higher, so that the brominated butyl rubber is unstable when the time is longer; the brominated butyl rubber is transferred into a rubber extruder with stronger shearing action, so that the aim of uniformly mixing can be fulfilled while the stability of the brominated butyl rubber is kept at a lower temperature.
Compared with the prior art, the invention has the advantages that:
1) butyl rubber and brominated butyl rubber are used as raw rubber, and solid vulcanization points on a polymer chain of the brominated butyl rubber have stronger reactivity, so that the brominated butyl rubber and unsaturated parts of the butyl rubber have stronger cohesiveness, and the vulcanization time can be shortened while the strength is improved;
2) solid vulcanization points on a polymer chain of the brominated butyl rubber have stronger reactivity, the mixing time is not suitable to be overlong at higher temperature, a rubber extruder is taken as three-section rubber mixing equipment, the mixing time at higher temperature is shortened, the stability of the brominated butyl rubber is kept, and the aim of uniform mixing is fulfilled;
3) the zinc oxide master colloidal particle can effectively solve the problems of inaccurate measurement of zinc oxide and uneven dispersion in raw rubber so as to improve the uniformity of processed rubber sheets.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments.
The rubber material formula of the high-strength tire curing bladder comprises, by weight, 60-80 parts of butyl rubber, 20-40 parts of brominated butyl rubber, 6-13 parts of carbon black, 12-27 parts of acetylene carbon black, 6-13 parts of graphite, 3-12 parts of aluminum oxide, 1-2.5 parts of stearic acid, 1.5-3.4 parts of paraffin, 1-4.5 parts of vulcanized resin, 0.5-3 parts of sulfur and 3-5 parts of zinc oxide master batch particles;
the preparation steps are as follows:
s1, weighing the materials according to the formula;
s2, processing the film
S21, mixing rubber: adding the raw rubber, 1/2 filler, activator and processing aid into an internal mixer, carrying out internal mixing at 90-110 ℃ for 1-10min, and discharging the internal mixed rubber material;
s22, secondary rubber mixing: adding the banburying rubber material in the S21 into an open mill, simultaneously adding the rest 1/2 filler, and mixing for 5-10min at the temperature of 100 ℃ and 120 ℃; adding a vulcanizing agent, mixing for 2-5min, and discharging mixed rubber;
s23, three-stage rubber mixing: heating the cylinder temperature of a rubber extruder to 50-55 ℃, the head temperature to 60-65 ℃ and the extrusion port temperature to 70-75 ℃, preserving heat, feeding the mixed rubber material in S22 into the feeding port of the extruder, starting an extrusion screw, controlling the extrusion pressure to be 10-12MPa, extruding the capsule rubber material to the head from the cylinder by the extrusion screw, and finally extruding the sheet rubber material from the extrusion port, wherein the sheet extrusion speed of the sheet rubber material is controlled to be 2.5-3 m/min;
s24, hanging the flaky rubber material on a material rack and naturally cooling to room temperature;
s3, injection vulcanization: placing the film obtained in the step S24 into an injection vulcanizing machine, controlling the temperature of a screw at 70-80 ℃ and controlling the pressure at 16-18 MPa; the injection vulcanization temperature is 180 ℃ and 200 ℃, and the vulcanization time is 30-42 min; and after vulcanization, the injection vulcanizing machine ejects the tire bladder out of the mold cavity, and the high-strength tire vulcanizing bladder is prepared.
Example 1:
the preparation method of the high-strength tire curing bladder comprises the following steps:
s1, weighing materials according to a formula, 80 parts of butyl rubber, 20 parts of brominated butyl rubber, 7 parts of carbon black, 13 parts of acetylene carbon black, 7 parts of graphite, 3 parts of aluminum oxide, 1.6 parts of stearic acid, 3.4 parts of paraffin, 4.5 parts of vulcanized resin, 1.5 parts of sulfur and 3 parts of zinc oxide master colloidal particles;
s2, processing the film
S21, mixing rubber: adding raw rubber, 1/2 filler, activator and processing aid into an internal mixer, carrying out internal mixing at 110 ℃ for 10min, and discharging internal mixing rubber materials;
s22, secondary rubber mixing: adding the banburying rubber material in the S21 into an open mill, simultaneously adding the rest 1/2 filler, and mixing for 8min at 120 ℃; adding a vulcanizing agent, mixing for 4min, and discharging mixed rubber;
s23, three-stage rubber mixing: heating the cylinder temperature of a rubber extruder to 55 ℃, the head temperature to 65 ℃ and the extrusion port temperature to 75 ℃, preserving heat, putting the mixed rubber material in S22 into the feeding port of the extruder, starting an extrusion screw, controlling the extrusion pressure to be 12MPa, extruding the capsule rubber material to the head from the cylinder by the extrusion screw, and finally extruding the sheet rubber material from the extrusion port, wherein the sheet extrusion speed of the sheet rubber material is controlled to be 2.5 m/min;
s24, hanging the flaky rubber material on a material rack and naturally cooling to room temperature;
s3, injection vulcanization: placing the film obtained in the step S24 into an injection vulcanizing machine, controlling the temperature of a screw at 80 ℃ and controlling the pressure at 18 MPa; the injection vulcanization temperature is 190 ℃, and the vulcanization time is 42 min; and after vulcanization, the injection vulcanizing machine ejects the tire bladder out of the mold cavity, and the high-strength tire vulcanizing bladder is prepared.
Example 2:
the preparation method of the high-strength tire curing bladder comprises the following steps:
s1, weighing materials according to a formula, wherein the materials comprise 75 parts of butyl rubber, 25 parts of brominated butyl rubber, 6 parts of carbon black, 12 parts of acetylene carbon black, 6 parts of graphite, 6 parts of aluminum oxide, 2.5 parts of stearic acid, 2.5 parts of paraffin, 3 parts of vulcanized resin, 3 parts of sulfur and 3.5 parts of zinc oxide master batch;
s2, processing the film
S21, mixing rubber: adding raw rubber, 1/2 filler, activator and processing aid into an internal mixer, carrying out internal mixing at 105 ℃ for 8min, and discharging internal mixing rubber materials;
s22, secondary rubber mixing: adding the banburying rubber material in the S21 into an open mill, simultaneously adding the rest 1/2 filler, and mixing for 8min at 115 ℃; adding a vulcanizing agent, mixing for 3min, and discharging mixed rubber;
s23, three-stage rubber mixing: heating the cylinder temperature of a rubber extruder to 55 ℃, the head temperature to 65 ℃ and the extrusion port temperature to 75 ℃, preserving heat, putting the mixed rubber material in S22 into the feeding port of the extruder, starting an extrusion screw, controlling the extrusion pressure to be 12MPa, extruding the capsule rubber material to the head from the cylinder by the extrusion screw, and finally extruding the sheet rubber material from the extrusion port, wherein the sheet extrusion speed of the sheet rubber material is controlled to be 2.5 m/min;
s24, hanging the flaky rubber material on a material rack and naturally cooling to room temperature;
s3, injection vulcanization: placing the film obtained in the step S24 into an injection vulcanizing machine, controlling the temperature of a screw at 80 ℃ and controlling the pressure at 18 MPa; the injection vulcanization temperature is 200 ℃, and the vulcanization time is 40 min; and after vulcanization, the injection vulcanizing machine ejects the tire bladder out of the mold cavity, and the high-strength tire vulcanizing bladder is prepared.
Example 3:
the preparation method of the high-strength tire curing bladder comprises the following steps:
s1, weighing materials according to a formula, wherein the materials comprise 70 parts of butyl rubber, 30 parts of brominated butyl rubber, 9 parts of carbon black, 18 parts of acetylene carbon black, 9 parts of graphite, 9 parts of aluminum oxide, 2 parts of stearic acid, 1.5 parts of paraffin, 3 parts of vulcanized resin, 2 parts of sulfur and 4 parts of zinc oxide master colloidal particles;
s2, processing the film
S21, mixing rubber: adding raw rubber, 1/2 filler, activator and processing aid into an internal mixer, carrying out internal mixing at 100 ℃ for 6min, and discharging internal mixing rubber materials;
s22, secondary rubber mixing: adding the banburying rubber material in the S21 into an open mill, simultaneously adding the rest 1/2 filler, and mixing for 10min at 105 ℃; adding a vulcanizing agent, mixing for 5min, and discharging mixed rubber;
s23, three-stage rubber mixing: heating the cylinder temperature of a rubber extruder to 50 ℃, the head temperature to 60 ℃ and the extrusion port temperature to 70 ℃, preserving heat, putting the mixed rubber material in S22 into the feeding port of the extruder, starting an extrusion screw, controlling the extrusion pressure to be 10MPa, extruding the capsule rubber material to the head from the cylinder by the extrusion screw, and finally extruding the sheet rubber material from the extrusion port, wherein the sheet discharging speed of the sheet rubber material is controlled to be 3 m/min;
s24, hanging the flaky rubber material on a material rack and naturally cooling to room temperature;
s3, injection vulcanization: placing the film obtained in the step S24 into an injection vulcanizing machine, controlling the temperature of a screw at 75 ℃ and controlling the pressure at 17 MPa; the injection vulcanization temperature is 190 ℃, and the vulcanization time is 38 min; and after vulcanization, the injection vulcanizing machine ejects the tire bladder out of the mold cavity, and the high-strength tire vulcanizing bladder is prepared.
Example 4:
the preparation method of the high-strength tire curing bladder comprises the following steps:
s1, weighing materials according to a formula, 65 parts of butyl rubber, 35 parts of brominated butyl rubber, 13 parts of carbon black, 27 parts of acetylene carbon black, 13 parts of graphite, 7 parts of aluminum oxide, 1 part of stearic acid, 2 parts of paraffin, 1.5 parts of vulcanized resin, 0.5 part of sulfur and 4.5 parts of zinc oxide master batch;
s2, processing the film
S21, mixing rubber: adding raw rubber, 1/2 filler, activator and processing aid into an internal mixer, carrying out internal mixing at 95 ℃ for 6min, and discharging internal mixing rubber materials;
s22, secondary rubber mixing: adding the banburying rubber material in the S21 into an open mill, simultaneously adding the rest 1/2 filler, and mixing for 5min at 110 ℃; adding a vulcanizing agent, mixing for 4min, and discharging mixed rubber;
s23, three-stage rubber mixing: heating the cylinder temperature of a rubber extruder to 50 ℃, the head temperature to 60 ℃ and the extrusion port temperature to 70 ℃, preserving heat, putting the mixed rubber material in S22 into the feeding port of the extruder, starting an extrusion screw, controlling the extrusion pressure to be 10MPa, extruding the capsule rubber material to the head from the cylinder by the extrusion screw, and finally extruding the sheet rubber material from the extrusion port, wherein the sheet discharging speed of the sheet rubber material is controlled to be 3 m/min;
s24, hanging the flaky rubber material on a material rack and naturally cooling to room temperature;
s3, injection vulcanization: placing the film obtained in the step S24 into an injection vulcanizing machine, controlling the temperature of a screw at 70 ℃ and controlling the pressure at 16 MPa; the injection vulcanization temperature is 180 ℃, and the vulcanization time is 35 min; and after vulcanization, the injection vulcanizing machine ejects the tire bladder out of the mold cavity, and the high-strength tire vulcanizing bladder is prepared.
Example 5:
the preparation method of the high-strength tire curing bladder comprises the following steps:
s1, weighing materials according to a formula, 60 parts of butyl rubber, 40 parts of brominated butyl rubber, 12 parts of carbon black, 24 parts of acetylene carbon black, 12 parts of graphite, 12 parts of aluminum oxide, 1.5 parts of stearic acid, 1.5 parts of paraffin, 1 part of vulcanized resin, 1 part of sulfur and 5 parts of zinc oxide master batch;
s2, processing the film
S21, mixing rubber: adding raw rubber, 1/2 filler, activator and processing aid into an internal mixer, carrying out internal mixing at 90 ℃ for 4min, and discharging internal mixing rubber materials;
s22, secondary rubber mixing: adding the banburying rubber material in the S21 into an open mill, simultaneously adding the rest 1/2 filler, and mixing for 10min at 100 ℃; adding a vulcanizing agent, mixing for 2min, and discharging mixed rubber;
s23, three-stage rubber mixing: heating the cylinder temperature of a rubber extruder to 50 ℃, the head temperature to 60 ℃ and the extrusion port temperature to 70 ℃, preserving heat, putting the mixed rubber material in S22 into the feeding port of the extruder, starting an extrusion screw, controlling the extrusion pressure to be 10MPa, extruding the capsule rubber material to the head from the cylinder by the extrusion screw, and finally extruding the sheet rubber material from the extrusion port, wherein the sheet discharging speed of the sheet rubber material is controlled to be 3 m/min;
s24, hanging the flaky rubber material on a material rack and naturally cooling to room temperature;
s3, injection vulcanization: placing the film obtained in the step S24 into an injection vulcanizing machine, controlling the temperature of a screw at 70 ℃ and controlling the pressure at 16 MPa; the injection vulcanization temperature is 180 ℃, and the vulcanization time is 30 min; and after vulcanization, the injection vulcanizing machine ejects the tire bladder out of the mold cavity, and the high-strength tire vulcanizing bladder is prepared.
Mechanical properties were measured on the films of examples 1-5 and the experimental data are shown in table 1.
TABLE 1 mechanical Property test results of films in examples 1-5
In the prior art, the rubber sheet for preparing the tire curing bladder has the hardness of 58-65A, the tensile strength of 12-15MPa, the tearing strength of 28-33kN/m, the elongation at break of 600-700%, the 300% stress at definite elongation of 8-10MPa and the permanent deformation of 20-30%. According to the analysis of experimental results, the technical scheme of the invention improves the tensile strength and the tearing strength of the rubber sheet for preparing the tire curing bladder, enhances the elastic deformation recovery capability of the rubber sheet, and has other performances equivalent to those in the prior art; in addition, the vulcanization time is obviously shortened in the production.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.
Claims (5)
1. A method for preparing a tire curing bladder, a raw material of the tire curing bladder, comprises the following steps: raw rubber, a filling agent, an active agent, a processing aid and a vulcanizing agent, and is characterized in that,
in the tire curing bladder raw material, the raw rubber comprises: butyl rubber and brominated butyl rubber; the filler comprises: high structure wear resistant carbon black, acetylene black, graphite and aluminum oxide; the active agent is zinc oxide master batch particles; the processing aid comprises: stearic acid, paraffin wax; the vulcanizing agent comprises a vulcanizing resin and sulfur;
the unsaturation degree of the butyl rubber is 0.5-2%, and bromine in the brominated butyl rubber is 1.5-2.5%;
the preparation steps are as follows:
s1, weighing the materials according to the formula, wherein the weight parts are as follows: 100 parts of raw rubber, 30-60 parts of filler, 3-5 parts of activator, 3-5 parts of processing aid and 2-6 parts of vulcanizing agent;
s2, processing the film:
s21, mixing rubber: adding the raw rubber, 1/2 filler, activator and processing aid into an internal mixer, carrying out internal mixing at 90-110 ℃ for 1-10min, and discharging the internal mixed rubber material;
s22, secondary rubber mixing: adding the banburying rubber material in the S21 into an open mill, simultaneously adding the rest 1/2 filler, and mixing for 5-10min at the temperature of 100 ℃ and 120 ℃; adding a vulcanizing agent, mixing for 2-5min, and discharging mixed rubber;
s23, three-stage rubber mixing: heating the cylinder temperature of a rubber extruder to 50-55 ℃, the head temperature to 60-65 ℃ and the extrusion port temperature to 70-75 ℃, preserving heat, feeding the mixed rubber material in S22 into the feeding port of the extruder, starting an extrusion screw, controlling the extrusion pressure to be 10-12MPa, extruding the capsule rubber material to the head from the cylinder by the extrusion screw, and finally extruding the sheet rubber material from the extrusion port, wherein the sheet extrusion speed of the sheet rubber material is controlled to be 2.5-3 m/min;
s24, hanging the flaky rubber material on a material rack and naturally cooling to room temperature;
s3, injection vulcanization: placing the film obtained in the step S24 into an injection vulcanizing machine, controlling the temperature of a screw at 70-80 ℃ and controlling the pressure at 16-18 MPa; the injection vulcanization temperature is 180 ℃ and 200 ℃, and the vulcanization time is 30-42 min; after vulcanization, the injection vulcanizing machine ejects the tire bladder out of the mold cavity, and the high-strength tire vulcanization bladder is prepared;
the preparation steps of the zinc oxide master batch particles are as follows: firstly, putting carrier rubber and zinc stearate into an open mill according to a proportion, and plasticating uniformly; then putting the product, zinc oxide powder and naphthenic base mineral oil into an internal mixer according to the proportion, and mixing and internally mixing; and finally, feeding the materials obtained by mixing and banburying into a conveying hopper, conveying the materials to a conical double-screw forced kneading machine, kneading, conveying the materials to a single-screw cold-feeding extruder, and granulating and discharging.
2. The method of claim 1, wherein the butyl rubber is present in an amount of 60 to 80% by mass of the green rubber, and the brominated butyl rubber is present in an amount of 20 to 40% by mass of the green rubber.
3. The method for preparing the tire curing bladder as claimed in claim 1, wherein the mass fraction ratio of the high-structure wear-resistant carbon black, the acetylene black, the graphite and the aluminum oxide in the filler is (1-2): (2-4): (1-2):1.
4. The method for preparing a tire curing bladder according to claim 1, wherein the mass fraction ratio of stearic acid to paraffin in the processing aid is 1: (1-2).
5. The method for preparing a tire curing bladder according to claim 1, wherein the mass fraction ratio of the curing resin to the sulfur in the curing agent is (1-3): 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911293041.3A CN110698776A (en) | 2019-12-16 | 2019-12-16 | Preparation method of high-strength tire curing bladder |
| PCT/CN2019/126523 WO2021120085A1 (en) | 2019-12-16 | 2019-12-19 | Manufacturing method for high-strength tire curing bladder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911293041.3A CN110698776A (en) | 2019-12-16 | 2019-12-16 | Preparation method of high-strength tire curing bladder |
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Cited By (3)
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| CN111423740A (en) * | 2020-03-30 | 2020-07-17 | 安徽佳通乘用子午线轮胎有限公司 | Rubber composition for curing bladder and preparation method thereof |
| CN113429689A (en) * | 2021-06-29 | 2021-09-24 | 三角轮胎股份有限公司 | Ultra-high heat conduction tire vulcanization capsule rubber composition and process for producing capsule |
| CN113563671A (en) * | 2021-07-23 | 2021-10-29 | 威海市润通橡胶有限公司 | Tire curing bladder and preparation method thereof |
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| CN114734567A (en) * | 2022-03-03 | 2022-07-12 | 江阴市昌雄金属科技有限公司 | Processing technology of high-strength rubber sealing gasket for tire valve |
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| WO2021120085A1 (en) | 2021-06-24 |
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