CN111016127A - Production process of radial tire capsules - Google Patents
Production process of radial tire capsules Download PDFInfo
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- CN111016127A CN111016127A CN201911380662.5A CN201911380662A CN111016127A CN 111016127 A CN111016127 A CN 111016127A CN 201911380662 A CN201911380662 A CN 201911380662A CN 111016127 A CN111016127 A CN 111016127A
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/345—Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0606—Vulcanising moulds not integral with vulcanising presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0649—Devices for removing vulcanising cores, i.e. bladders, from the tyres; Opening the press in combination herewith
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0654—Flexible cores therefor, e.g. bladders, bags, membranes, diaphragms
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0606—Vulcanising moulds not integral with vulcanising presses
- B29D2030/0607—Constructional features of the moulds
- B29D2030/0617—Venting devices, e.g. vent plugs or inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0662—Accessories, details or auxiliary operations
- B29D2030/0666—Heating by using fluids
- B29D2030/0667—Circulating the fluids, e.g. introducing and removing them into and from the moulds; devices therefor
- B29D2030/067—Circulating the fluids, e.g. introducing and removing them into and from the moulds; devices therefor the vulcanizing fluids being gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0662—Accessories, details or auxiliary operations
- B29D2030/0675—Controlling the vulcanization processes
- B29D2030/0677—Controlling temperature differences
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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
- C08K2201/011—Nanostructured additives
-
- 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
Abstract
The invention discloses a production process of radial tire capsules, which comprises the following steps: s1, first-stage glue: according to the weight parts, pouring butyl rubber and chloroprene rubber into an internal mixer, adding high-structure carbon black, stearic acid and castor oil, heating and internally mixing to obtain a first-stage rubber; s2, secondary glue: adding the first-stage rubber obtained in the step S1, zinc oxide, ferric chloride, polychloroprene and vulcanized resin in parts by weight, and banburying in an internal mixer to obtain a second-stage rubber; s3, extrusion slicing: s4, vulcanizing; s5, storage: the vulcanized capsule is placed indoors and stored in a dark condition, and the storage environment is kept clean and dry. According to the invention, the qualification rate and quality of the adhesive tape are improved by improving the extrusion molding process, and the subsequent processing is facilitated; the pre-isolation agent is coated, a post-vulcanization process is combined, the isolation effect is improved by utilizing high-temperature aging, and the subsequent service life of the product is prolonged.
Description
Technical Field
The invention relates to the technical field of tire manufacturing, in particular to a high-strength tire curing bladder and a production process thereof.
Background
Tire bladders are an integral consumable component for the manufacture of tires. During the vulcanization process of the tire, the tire bladder is filled with compressed gas or superheated water to stretch and expand the tire rubber blank to form an internal pressure vulcanized tire. The compressed gas is usually nitrogen, the superheated water is hot water subjected to oxygen removal, and the process arrangement avoids the oxidation of the tire bladder as much as possible, so that the service life of the tire bladder is prolonged.
The tire is vulcanized, and the performance, particularly the mechanical performance, of the tire can be remarkably improved. The tire curing bladder is a tool for tire curing and is an important mold in the tire manufacturing process. The tire curing bladder is mainly used for heating the inner wall of the tire through the bladder, so that the tire curing bladder needs to have good heat transfer performance.
In the production process of the existing tire curing bladder, the rubber strip has more bubble content in the extrusion process, the rubber strip can expand after being extruded, the extrusion molding efficiency of the rubber strip is low, the extrusion cavity is easy to block, break and the like, and the qualification rate of the extruded rubber strip is relatively low, so that the subsequent production process is not facilitated; in addition, the release agent is usually applied in the prior tire bladder in a preposed manner when the tire bladder is used as a tire forming mold, so that the demolding of the tire forming is facilitated, and the smoothness of the tire is improved.
Disclosure of Invention
In order to solve the problems, the invention provides a production process of radial tire capsules, which improves the qualification rate and the quality of rubber strips by improving the extrusion molding process and is beneficial to subsequent processing; the pre-isolation agent is coated, a post-vulcanization process is combined, the isolation effect is improved by utilizing high-temperature aging, and the subsequent service life of the product is prolonged.
In order to achieve the purpose, the invention adopts the technical scheme that:
a production process of radial tire capsules comprises the following steps: s1, first-stage glue: according to the weight parts, 95-105 parts of butyl rubber and 3-6 parts of chloroprene rubber are poured into a banbury mixer at the temperature of 45-50 ℃, 30-40 parts of high-structure carbon black, 1-1.2 parts of stearic acid and 4-5 parts of castor oil are added after 2-3 minutes, the temperature is raised to 165-170 ℃, and the banburying is carried out for 10-15 minutes, and then rubber is discharged to obtain a first-stage rubber; s2, secondary glue: adding 4-5 parts by weight of zinc oxide, 1-3 parts by weight of ferric chloride, 2-4 parts by weight of polychloroprene and 4-8 parts by weight of vulcanized resin into the first-stage adhesive obtained in the step S1, internally mixing the mixture for 15-20min in an internal mixer at the temperature of 105-110 ℃ and then discharging the adhesive to obtain a second-stage adhesive; s3, extrusion slicing: a forced feeding extruder is used, an extrusion opening is provided with a rubber strip forming die, and the rubber strip is cut into rubber strips after extrusion; s4, vulcanization treatment: s41 primary vulcanization: injecting the rubber strip into a vulcanizing machine, closing an upper die and a lower die in the vulcanizing machine, and arranging an exhaust device in the upper die and/or the lower die to complete exhaust and pressure stabilization; after pressure stabilization, continuously keeping the pressure at 15-16 MPa, keeping the vulcanization temperature at 185-195 ℃, keeping the pressure and keeping the temperature for 3-5 minutes, opening the upper die and the lower die after pressure relief, and taking out the capsule; s42 post-vulcanization: spraying a separant on the outer surface layer of the capsules, arranging the capsules at intervals, and standing in a drying room at 100-135 ℃ for 24-48 hours; s5, storage: the vulcanized capsule is placed indoors and stored in a dark condition, and the storage environment is kept clean and dry.
In step S1, the high-structure carbon black is N220, the particle size is 25-40nm, and the vulcanized resin is zinc bromide-based phenol formaldehyde resin.
In step S1, the high structure carbon black is added first, followed by castor oil.
In step S3, the adhesive tape forming die includes a die body and at least 4 extrusion cavities arranged in the die body, the extrusion cavities are in a track hole structure, and the extrusion cavities are arranged in an array.
The width of the extrusion cavity is 10-15 cm, and the thickness of the extrusion cavity is 0.5-0.8 cm.
And step S3, the method further comprises an adhesive tape screening process, wherein the specification and the size of the adhesive tape are 1-1.5 times of those of the extrusion cavity.
The density of the rubber strip is at least 1.1g/cm3。
In step S41, the exhaust device is a plurality of exhaust holes, the plurality of exhaust holes are arranged in at least two layers, and the plurality of exhaust holes in the same layer are arranged at equal intervals along the periphery of the upper die or the lower die.
In step S42, the release agent is a liquid release agent, and the release agent is composed of hydroxy polydimethylsiloxane, polymethylhydrosiloxane, emulsifier, co-emulsifier, defoamer, bactericide and deionized water.
The mass ratio of hydroxy polydimethylsiloxane to polymethylhydrosiloxane is 6: 1-7: 1.
the invention has the following beneficial effects: the invention improves the production process by optimizing the design, particularly realizes the extrusion of the rubber strip by combining a forced feeding extruder with a rubber strip forming die, and is used for improving the forming quality of the rubber strip; the pre-isolation agent is coated, a post-vulcanization process is combined, and high-temperature aging is utilized to improve the isolation effect, so that the subsequent service life of the product is prolonged; the optimization of the exhaust structure and the process is beneficial to improving the quality of the tire bladder, and particularly greatly improves the bubble-free qualification rate of products.
The features of the present invention will be apparent from the accompanying drawings and from the detailed description of the preferred embodiments which follows.
Drawings
FIG. 1 is a schematic structural view of a rubber strip forming mold of the present invention;
FIG. 2 is a schematic view of the exhaust apparatus of the present invention;
in the figure: 1. forming a rubber strip mold; 11. a mold body; 12. extruding the die cavity; 2. an upper die; 3. a lower die; 4. and an exhaust device.
Detailed Description
In order to make the objects and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the specific drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
In combination with the drawings, the embodiment discloses a production process of radial tire capsules, which comprises the following steps:
s1, first-stage glue: according to the weight parts, 95-105 parts of butyl rubber and 3-6 parts of chloroprene rubber are poured into a banbury mixer at the temperature of 45-50 ℃, 30-40 parts of high-structure carbon black, 1-1.2 parts of stearic acid and 4-5 parts of castor oil are added after 2-3 minutes, the temperature is raised to 165-170 ℃, and the banburying is carried out for 10-15 minutes, and then rubber is discharged to obtain a first-stage rubber; the high-structure carbon black is N220, the particle size is 25-40nm, and the vulcanized resin is zinc bromide-based phenol formaldehyde resin; adding high-structure carbon black and then adding castor oil;
s2, secondary glue: adding 4-5 parts by weight of zinc oxide, 1-3 parts by weight of ferric chloride, 2-4 parts by weight of polychloroprene and 4-8 parts by weight of vulcanized resin into the first-stage adhesive obtained in the step S1, internally mixing the mixture for 15-20min in an internal mixer at the temperature of 105-110 ℃ and then discharging the adhesive to obtain a second-stage adhesive;
in the working procedures, the raw material proportion and the production process are optimized, the dispersion effect of the zinc oxide can be enhanced by adding the polychloroprene, the capsule vulcanization can be facilitated by improving the dispersion effect, and the service life of the tire vulcanization capsule can be greatly prolonged by the good dispersion performance of the zinc oxide.
S3, extrusion slicing: a forced feeding extruder is used, an extrusion opening is provided with a rubber strip forming die 1, and the rubber strip is cut into rubber strips after extrusion; the adhesive tape forming die 1 comprises a die body 11 and at least 4 extrusion cavities 12 arranged in the die body 11, wherein the extrusion cavities 12 are of a runway hole structure, and the extrusion cavities 12 are arranged in an array; the width of the extrusion cavity is 10-15 cm, and the thickness of the extrusion cavity is 0.5-0.8 cm; the method further comprises an adhesive tape screening process, wherein the specification and the size of the adhesive tape are 1-1.5 times of those of the extrusion cavity; the density of the rubber strip is at least 1.1g/cm3。
In the above-mentioned process, utilize and improve the adhesive tape moulded die, utilize the die cavity of extruding of runway hole column structure, optimize simultaneously and extrude die cavity specification and dimension, many adhesive tapes one-time forming of can being convenient for can reduce the stress surface of extruding of adhesive tape shaping die cavity, reduce and extrude frictional force, improve and extrude the compactness of smoothness and extrusion to can guarantee the uniformity that the product was extruded, reduce the degree of expansion of extruding of adhesive tape, improve the quality of adhesive tape.
S4, vulcanization treatment: s41 primary vulcanization: injecting the rubber strip into a vulcanizing machine, completing the closing of an upper die 2 and a lower die 3 in the vulcanizing machine, and completing the air exhaust and pressure stabilization by arranging an air exhaust device 4 in the upper die 2 and/or the lower die 3; the exhaust device 4 is a plurality of exhaust holes which are arranged in at least two layers, and the exhaust holes in the same layer are arranged at equal intervals along the periphery of the upper die or the lower die; after pressure stabilization, continuously keeping the pressure at 15-16 MPa, keeping the vulcanization temperature at 185-195 ℃, keeping the pressure and keeping the temperature for 3-5 minutes, opening the upper die and the lower die after pressure relief, and taking out the capsule; the optimization of the exhaust structure and the process is beneficial to improving the quality of the tire bladder, and particularly greatly improves the bubble-free qualification rate of products.
S42 post-vulcanization: spraying a separant on the outer surface layer of the capsules, arranging the capsules at intervals, and standing in a drying room at 100-135 ℃ for 24-48 hours; the separant is a liquid separant and consists of hydroxy polydimethylsiloxane, polymethylhydrosiloxane, an emulsifier, an auxiliary emulsifier, a defoaming agent, a bactericide and deionized water; the mass ratio of hydroxy polydimethylsiloxane to polymethylhydrosiloxane is 6: 1-7: 1; the pre-isolation agent is coated, a post-vulcanization process is combined, the isolation effect is improved by utilizing high-temperature aging, and the subsequent service life of the product is prolonged.
The hydroxyl in the hydroxyl polydimethylsiloxane is a polar group, so that the adhesive force of a polysiloxane film on a tire capsule is enhanced, the hydroxyl can generate cross-linking reaction between molecules, and simultaneously the hydroxyl is combined with the polymethylhydrosiloxane to form a compact film through interaction to be attached to the surface of the capsule, so that the tire capsule has the characteristics of strong adhesive force and difficulty in falling off, and the film has good durability and elasticity, effectively protects the capsule and prolongs the service life of the capsule.
S5, storage: the vulcanized capsule is placed indoors and stored in a dark condition, and the storage environment is kept clean and dry.
The invention improves the production process by optimizing the design, particularly realizes the extrusion of the rubber strip by combining a forced feeding extruder with a rubber strip forming die, and is used for improving the forming quality of the rubber strip; the pre-isolation agent is coated, a post-vulcanization process is combined, and high-temperature aging is utilized to improve the isolation effect, so that the subsequent service life of the product is prolonged; the optimization of the exhaust structure and the process is beneficial to improving the quality of the tire bladder, and particularly greatly improves the bubble-free qualification rate of products.
Example 2
A production process of radial tire capsules comprises the following steps:
s1, first-stage glue: pouring 100 parts of butyl rubber and 5 parts of chloroprene rubber into a 50 ℃ internal mixer, adding 35 parts of high-structure carbon black, 1 part of stearic acid and 4 parts of castor oil after 3 minutes, and adding the high-structure carbon black and then adding the castor oil; raising the temperature to 165 ℃, banburying for 15min, and then discharging to obtain a first-stage glue; the high-structure carbon black is N220, the particle size is 30nm, and the vulcanized resin is zinc bromide-based phenol formaldehyde resin;
s2, secondary glue: adding the first-stage rubber obtained in the step S1, 5 parts of zinc oxide, 2 parts of ferric chloride, 3 parts of polychloroprene and 6 parts of vulcanized resin by weight, internally mixing in an internal mixer at the temperature of 110 ℃ for 20min, and then discharging rubber to obtain second-stage rubber;
in the working procedures, the raw material proportion and the production process are optimized, the dispersion effect of the zinc oxide can be enhanced by adding the polychloroprene, the capsule vulcanization can be facilitated by improving the dispersion effect, and the service life of the tire vulcanization capsule can be greatly prolonged by the good dispersion performance of the zinc oxide.
S3, extrusion slicing: a forced feeding extruder is used, an extrusion opening is provided with a rubber strip forming die, and the rubber strip is cut into rubber strips after extrusion; the adhesive tape forming die comprises a die body and 4 extrusion cavities arranged in the die body, wherein the extrusion cavities are of a runway hole structure, and are arranged in an array manner and in a four-grid manner; the width of the extrusion cavity is 15cm, and the thickness of the extrusion cavity is 0.8 cm; the method also comprises an adhesive tape screening process, wherein the specification and the size of the adhesive tape are 1.1-1.2 times of those of the extrusion cavity; the density of the rubber strip is1.1g/cm3～1.125g/cm3。
In the above-mentioned process, utilize and improve the adhesive tape moulded die, utilize the die cavity of extruding of runway hole column structure, optimize simultaneously and extrude die cavity specification and dimension, many adhesive tapes one-time forming of can being convenient for can reduce the stress surface of extruding of adhesive tape shaping die cavity, reduce and extrude frictional force, improve and extrude the compactness of smoothness and extrusion to can guarantee the uniformity that the product was extruded, reduce the degree of expansion of extruding of adhesive tape, improve the quality of adhesive tape.
S4, vulcanization treatment: s41 primary vulcanization: injecting the rubber strip into a vulcanizing machine, closing an upper die and a lower die in the vulcanizing machine, and arranging an exhaust device in the upper die and/or the lower die to complete exhaust and pressure stabilization; the exhaust device is a plurality of exhaust holes which are arranged in at least two layers, and the exhaust holes in the same layer are arranged at equal intervals along the periphery of the upper die or the lower die; after pressure stabilization, continuously keeping the pressure at 16MPa and the vulcanization temperature at 190 ℃, keeping the pressure and preserving the heat for 5 minutes, opening the upper die and the lower die after pressure relief, and taking out the capsule; the optimization of the exhaust structure and the process is beneficial to improving the quality of the tire bladder, and particularly greatly improves the bubble-free qualification rate of products.
S42 post-vulcanization: spraying a separant on the outer surface layer of the capsule, arranging the capsules at intervals, and standing for 48 hours in a drying room at the temperature of 120 ℃; the separant is a liquid separant and consists of hydroxy polydimethylsiloxane, polymethylhydrosiloxane, an emulsifier, an auxiliary emulsifier, a defoaming agent, a bactericide and deionized water; the mass ratio of the hydroxy polydimethylsiloxane to the polymethylhydrosiloxane is 6: 1; the pre-isolation agent is coated, a post-vulcanization process is combined, the isolation effect is improved by utilizing high-temperature aging, and the subsequent service life of the product is prolonged.
The hydroxyl in the hydroxyl polydimethylsiloxane is a polar group, so that the adhesive force of a polysiloxane film on a tire capsule is enhanced, the hydroxyl can generate cross-linking reaction between molecules, and simultaneously the hydroxyl is combined with the polymethylhydrosiloxane to form a compact film through interaction to be attached to the surface of the capsule, so that the tire capsule has the characteristics of strong adhesive force and difficulty in falling off, and the film has good durability and elasticity, effectively protects the capsule and prolongs the service life of the capsule.
S5, storage: the vulcanized capsule is placed indoors and stored in a dark condition, and the storage environment is kept clean and dry.
Example 3
Based on example 2, in step S2, the addition of polychloroprene was removed.
Example 4
Based on example 2, in step S3, the strip molding die of example 2 was replaced with a strip molding die of a single central extrusion cavity.
By adopting the process, the adhesive tape is extruded at a single center, the stress surface is large, the friction force is large, the specification and the size are relatively large, the subsequent slicing process can be usually matched, the extrusion cavity is of a cylindrical structure, the defects that bubbles are easy to appear inside and the like are caused, the adhesive tape is irregular in the long-term extrusion process, the expansion rate of the adhesive tape reaches 2-4 times, and the density is usually less than 1.0g/cm3。
Example 5
Based on embodiment 2, in step S41, the conventional upper and lower dies for single-hole degassing are used.
By adopting the process, the product is easy to have bubbles.
Example 6
Based on the embodiment 2, in step S42, the process of removing the spraying isolation agent on the outer surface layer of the capsule.
According to the above examples, the number of samples was 10, and the performance parameters were compared as follows:
| inspection item | Unit of | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 |
| Appearance of the product | - | Without out-of-tolerance defects | Without out-of-tolerance defects | Individual presence of bubbles | Individually exist fine bubbles | Without out-of-tolerance defects |
| Center thickness (to) | mm | 5.35~5.36 | 5.35~5.36 | 5.33~5.37 | 5.33~5.36 | 5.34~5.36 |
| Neck thickness (to') | mm | 7.10~7.12 | 7.10~7.13 | 7.07~7.15 | 7.08~7.14 | 7.09~7.12 |
| Width of clamping edge | mm | 12.90~12.93 | 12.89~12.93 | 12.84~12.95 | 12.85~12.96 | 12.88~12.92 |
| Height of clamping edge | mm | 21.8~22.2 | 21.8~22.2 | 21.7~22.4 | 21.7~22.4 | 21.8~22.2 |
| Stress at definite elongation of 300% | MPa | 10.2 | 9.6 | 9.9 | 9.8 | 10.1 |
| Tensile strength | MPa | 26.4 | 24.3 | 23.5 | 23.8 | 25.3 |
| Elongation at break | % | 680 | 600 | 580 | 585 | 660 |
| Tear strength | KN.M1 | 76 | 61 | 54 | 59 | 71 |
| Adhesive strength | N | 59.6 | 62.4 | 63.2 | 64.3 | 144.6 |
Wherein, the appearance detection is performed according to the specification of 6.2 in HG/T4626-2014.
From the comparison of the above table it can be derived:
example 2 is a preferred process of our application scheme, and examples 3, 4, 5 and 6 are all reference processes.
The comparison between example 2 and example 3 shows that the addition of polychloroprene improves the overall performance of the product.
The comparison of example 2 with examples 4 and 5 shows that bubbles have a great influence on the product performance.
Wherein, the comparison between example 2 and example 6 can show that the adhesive property is greatly improved.
The foregoing is only a preferred embodiment of this invention and it should be noted that numerous modifications and adaptations could be made by those skilled in the art without departing from the principles of this invention and are intended to be included within the scope of this invention.
Claims (10)
1. A production process of radial tire capsules is characterized by comprising the following steps:
s1, first-stage glue: according to the weight parts, 95-105 parts of butyl rubber and 3-6 parts of chloroprene rubber are poured into a banbury mixer at the temperature of 45-50 ℃, 30-40 parts of high-structure carbon black, 1-1.2 parts of stearic acid and 4-5 parts of castor oil are added after 2-3 minutes, the temperature is raised to 165-170 ℃, and the banburying is carried out for 10-15 minutes, and then rubber is discharged to obtain a first-stage rubber;
s2, secondary glue: adding 4-5 parts by weight of zinc oxide, 1-3 parts by weight of ferric chloride, 2-4 parts by weight of polychloroprene and 4-8 parts by weight of vulcanized resin into the first-stage adhesive obtained in the step S1, internally mixing the mixture for 15-20min in an internal mixer at the temperature of 105-110 ℃ and then discharging the adhesive to obtain a second-stage adhesive;
s3, extrusion slicing: a forced feeding extruder is used, an extrusion opening is provided with a rubber strip forming die, and the rubber strip is cut into rubber strips after extrusion;
s4, vulcanization treatment:
s41 primary vulcanization: injecting the rubber strip into a vulcanizing machine, closing an upper die and a lower die in the vulcanizing machine, and arranging an exhaust device in the upper die and/or the lower die to complete exhaust and pressure stabilization; after pressure stabilization, continuously keeping the pressure at 15-16 MPa, keeping the vulcanization temperature at 185-195 ℃, keeping the pressure and keeping the temperature for 3-5 minutes, opening the upper die and the lower die after pressure relief, and taking out the capsule;
s42 post-vulcanization: spraying a separant on the outer surface layer of the capsules, arranging the capsules at intervals, and standing in a drying room at 100-135 ℃ for 24-48 hours;
s5, storage: the vulcanized capsule is placed indoors and stored in a dark condition, and the storage environment is kept clean and dry.
2. The radial tire bladder production process according to claim 1, wherein: in step S1, the high-structure carbon black is N220, the particle size is 25-40nm, and the vulcanized resin is zinc bromide-based phenol formaldehyde resin.
3. A radial tire bladder production process according to claim 1 or 2, wherein: in step S1, the high structure carbon black is added first, followed by castor oil.
4. The radial tire bladder production process according to claim 1, wherein: in step S3, the adhesive tape forming die includes a die body and at least 4 extrusion cavities arranged in the die body, the extrusion cavities are in a track hole structure, and the extrusion cavities are arranged in an array.
5. The radial tire bladder production process according to claim 4, wherein: the width of the extrusion cavity is 10-15 cm, and the thickness of the extrusion cavity is 0.5-0.8 cm.
6. The radial tire bladder production process according to claim 4, wherein: and step S3, the method further comprises an adhesive tape screening process, wherein the specification and the size of the adhesive tape are 1-1.5 times of those of the extrusion cavity.
7. The radial tire bladder production process according to claim 6, wherein: the density of the rubber strip is at least 1.1g/cm3。
8. The radial tire bladder production process according to claim 1, wherein: in step S41, the exhaust device is a plurality of exhaust holes, the plurality of exhaust holes are arranged in at least two layers, and the plurality of exhaust holes in the same layer are arranged at equal intervals along the periphery of the upper die or the lower die.
9. The radial tire bladder production process according to claim 1, wherein: in step S42, the release agent is a liquid release agent, and the release agent is composed of hydroxy polydimethylsiloxane, polymethylhydrosiloxane, emulsifier, co-emulsifier, defoamer, bactericide and deionized water.
10. The radial tire bladder production process according to claim 9, wherein: the mass ratio of hydroxy polydimethylsiloxane to polymethylhydrosiloxane is 6: 1-7: 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112406129A (en) * | 2020-10-29 | 2021-02-26 | 清华大学 | Production method and production system of rubber part |
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