CN110815618A

CN110815618A - Preparation method of tire curing bladder

Info

Publication number: CN110815618A
Application number: CN201911119921.9A
Authority: CN
Inventors: 韩正奇; 赵海林; 张维晶; 张学永; 刘涛
Original assignee: Wing Yi Rubber Co Ltd
Current assignee: Wing Yi Rubber Co Ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-02-21

Abstract

The invention discloses a preparation method of a tire curing bladder, and relates to the technical field of tire curing bladder preparation. The tire curing bladder rubber compound comprises the following components: butyl rubber, ethylene propylene diene monomer, white carbon black, a silane coupling agent, brominated phenolic resin, sulfur, zinc oxide, stearic acid, an anti-aging agent RD and an accelerator TT; preheating raw rubber, granulating, adding into a continuous internal mixer, adding compounding agents, carrying out continuous internal mixing in a continuous internal mixing system, and finally carrying out injection vulcanization. Compared with the prior art, the invention has the beneficial effects that the butyl rubber and the ethylene propylene diene monomer are used together, so that the rubber material used by the tire curing bladder is continuously mixed under tight control by using a continuous internal mixer, the uniformity of the mixed rubber material is high, and the quality stability of the produced tire curing bladder is good; a control system of a continuous banburying process is improved, and the system runs smoothly; continuous banburying is carried out continuously in time, and the rubber mixing efficiency and the production efficiency can be improved.

Description

Preparation method of tire curing bladder

Technical Field

The invention relates to the technical field of tire curing bladder preparation, in particular to a preparation method of a 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. Tire curing bladders are important to the production of tires. The tire curing bladder is repeatedly used under the conditions of high temperature and high pressure for many times, and is required to have excellent performances such as air tightness, strength, aging resistance and the like. The rubber material used for preparing the tire curing bladder has direct influence on the quality of the tire curing bladder; as a sizing material used for hollow thin-wall rubber products, the uniform mixing plays a key role in improving the mechanical property of the hollow thin-wall rubber products, and the occurrence of weak points can be avoided.

At present, in the preparation of tires, a continuous internal mixer can realize continuous mixing of rubber materials under tight control so as to improve the mixing uniformity of the rubber materials. Continuous banburying is uninterrupted mixing, and rubber materials are heated due to shearing and friction in mixing, so scorching is easily caused; therefore, in a continuous internal mixing process, temperature control in a continuous internal mixer is very important. However, the rubber mixing of the tire curing bladder is carried out by adopting multiple devices of an internal mixer and an open mill for mixing in sections, rubber materials are discharged at different stages, and the rubber materials can be observed; but there are also problems: the mixing process of the rubber compound is not strict, the rubber compounds in the same batch have difference, and the subsequent product processing has instability. The rubber material used in the tire curing bladder is mainly butyl rubber, and the performance is seriously reduced after the single butyl rubber is subjected to continuous banburying. Therefore, in the past, tire curing bladder manufacturers cannot use a continuous internal mixer to perform continuous mixing under tight control on rubber materials used by tire curing bladders, and still depend on the operation experience of rubber mixing workers, and the operation characteristics of different rubber mixing workers are different, so that the quality of the tire curing bladders is unstable.

Disclosure of Invention

The invention provides a preparation method of a tire curing bladder, which takes butyl rubber and ethylene propylene diene monomer as main rubber materials of the tire curing bladder, realizes the continuous mixing of the rubber materials used by the tire curing bladder under the tight control, improves the mixing uniformity of the rubber materials and the quality stability of the prepared tire curing bladder.

The specific technical scheme is a preparation method of a tire curing bladder, and the rubber material comprises the following components: butyl rubber, ethylene propylene diene monomer, white carbon black, a silane coupling agent, brominated phenolic resin, sulfur, zinc oxide, stearic acid, an anti-aging agent RD and an accelerator TT;

the preparation method comprises the following steps:

s1, preheating the butyl rubber and the ethylene propylene diene monomer rubber on a heating plate;

s2, conveying the preheated butyl rubber and the ethylene propylene diene monomer to a rubber block granulator by using a conveyor, and crushing a large rubber block into rubber particles with the particle size of about 20mm by using the rubber block granulator;

s3, continuously banburying rubber materials:

s31, controlling a rubber block granulator to add rubber particles into a main feeding hole of a continuous internal mixer by using a controller, and adding white carbon black and a silane coupling agent into the main feeding hole to perform first-stage mixing;

s32, putting zinc oxide and stearic acid into a first auxiliary material cylinder, putting an anti-aging agent RD into a second auxiliary material cylinder, putting brominated phenolic resin, sulfur and a promoter TT into a third auxiliary material cylinder, opening a first feeding valve, a second feeding valve and a third feeding valve in sequence, and adding the zinc oxide, the stearic acid, the anti-aging agent RD, the brominated phenolic resin, the sulfur and the promoter TT into a continuous internal mixer through an auxiliary feeding hole;

carrying out two-stage mixing on the rubber materials in the S33 and S32 in a continuous internal mixer, and discharging the rubber materials;

s4, adding the rubber material in the S33 into a feeding port of an injection vulcanizing machine, setting the temperature of the injection vulcanizing machine to be 55-95 ℃, injecting the rubber material into a mold, setting the vulcanizing temperature to be 165-175 ℃, setting the vulcanizing time to be 20-30min, completing vulcanization, and ejecting a vulcanized capsule;

a system for continuously banburying a compound used to prepare a tire curing bladder, comprising:

the heating plate is used for preheating the rubber blocks so as to facilitate the processing of the rubber blocks, and is positioned at the front end of the conveyor;

the conveyor conveys the preheated rubber material to the rubber block granulator, and the tail end of the conveyor is positioned above a feeding port of the rubber block granulator;

a rubber block granulator, which is used for crushing the large rubber blocks into rubber particles with the particle size of about 20mm, wherein a discharge port of the rubber block granulator is positioned above a main feed port of the continuous internal mixer;

the continuous internal mixer is a place for carrying out sealing mixing on rubber particles and various compounding agents, the interior of a machine barrel can be divided into a main feeding part, an auxiliary feeding part, a mixing part and a discharging part, an oil inlet pipeline and an oil outlet pipeline are connected between an internal screw and a heat-conducting oil tank, and a water inlet pipe and a water outlet pipe are connected between a jacket layer and a cooling water tank;

the controller is used for controlling the feeding amount of the rubber block granulator in unit time, the rotating speed of the motor, detecting the temperature in the continuous internal mixer, controlling the oil temperature of the heat-conducting oil tank and the water temperature of the cooling water tank, and controlling the discharging amount of the continuous internal mixer, so that the stable operation of the continuous internal mixer is realized;

the heat conduction oil tank is used for introducing heat conduction oil to a screw of the continuous internal mixer to heat the interior of the continuous internal mixer and provide proper temperature for mixing rubber materials;

the cooling water tank is used for introducing cooling water into the jacket layer of the continuous internal mixer, so that the continuous internal mixer and the temperature of the rubber material are prevented from being continuously increased, and the rubber material is prevented from being scorched and machine parts are prevented from being aged;

the rubber block granulator, the continuous internal mixer, the motor, the heat conduction oil tank and the cooling water tank are respectively connected with the controller circuit.

Further, in the rubber material components, 40-60 parts of butyl rubber, 40-60 parts of ethylene propylene diene monomer, 10-30 parts of white carbon black, 1-6 parts of silane coupling agent, 2-4 parts of brominated phenolic resin, 1-1.5 parts of sulfur, 2-5 parts of zinc oxide, 0-2 parts of stearic acid, 1-3 parts of anti-aging agent RD, and 0.5-2 parts of accelerator TT.

Further, in the system for continuously mixing the rubber materials used for preparing the tire curing bladder, a columnar inner cylinder is arranged inside an outer shell of the continuous mixer, and a closed jacket layer for cooling water to flow is formed between the inner cylinder and the outer shell; a main feed inlet is arranged at the position close to the discharge port of the rubber block granulator and above the outer shell, an auxiliary feed inlet is arranged upwards in the middle of the outer shell, and the main feed inlet and the auxiliary feed inlet are respectively communicated with the inside of the inner cylinder; the internally mounted screw rod of barrel including, the screw rod divide into main feeding portion, first mixing portion, assistance feeding portion, the mixing portion of second and ejection of compact portion backward in proper order from the main feed inlet, and main feeding portion is corresponding with the position of main feed inlet, and assistance feeding portion is corresponding with the position of assisting the feed inlet, is equipped with the discharge gate in the below of ejection of compact portion department of correspondence, shell body, and the discharge gate communicates with each other with interior barrel is inside.

Further, in the system for continuously banburying the rubber materials used for preparing the tire curing bladder, a blanking valve is arranged below a rubber block granulator; a first auxiliary material cylinder, a second auxiliary material cylinder and a third auxiliary material cylinder are arranged above the auxiliary material inlet, and a first feeding valve, a second feeding valve and a third feeding valve are correspondingly arranged below the auxiliary material cylinders; a discharge valve is arranged below the discharge hole;

respectively installing temperature sensors at the main feeding part, the first mixing part, the auxiliary feeding part and the second mixing part, wherein the temperature sensors are a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor in sequence;

the blanking valve, the first feeding valve, the second feeding valve, the third feeding valve, the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the motor and the discharging valve are respectively connected with the controller circuit.

Further, in S3, the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor detect the temperatures at the main feeding portion, the first kneading portion, the sub-feeding portion, and the second kneading portion, respectively, and transmit them to the controller; the controller adjusts the discharge valve, the first feed valve, the second feed valve, the third feed valve, the motor and the discharge valve according to the detected temperature.

In the continuous mixing system, the heating plate, the conveyor, the rubber block granulator, the continuous mixer, the heat conducting oil tank, the cooling water tank and the controller are all required to be connected with electric power equipment, which is common knowledge in equipment application and is not described in detail in the invention.

After single butyl rubber is subjected to continuous banburying, the performance is seriously reduced, and the problem cannot be solved by adjusting the process parameters of equipment; in multiple experiments, the situation that the performance is reduced when the butyl rubber is used alone can be obviously improved by using the ethylene propylene diene monomer and then carrying out continuous banburying. The ethylene propylene diene monomer rubber belongs to rubber with high saturation degree, has excellent air tightness, adopts butyl rubber and ethylene propylene diene monomer rubber, and tire vulcanization capsules processed by continuously internally mixed rubber materials are superior to tire vulcanization capsules prepared by single butyl rubber in quality stability, and are basically the same in other performance aspects. This phenomenon can be explained: in the continuous banburying, the single mixing time of the butyl rubber is long, and in the continuous banburying process, the temperature of the rubber material is continuously increased along with the rotation of the screw, so that the long chain of the butyl rubber is broken, and the performance is seriously reduced; the ethylene propylene diene monomer and the butyl rubber tend to physically crosslink long chains of the ethylene propylene diene monomer in a single continuous banburying process with long mixing time; when the ethylene propylene diene monomer is used, the ethylene propylene diene monomer directly reduces the shearing chance of the butyl rubber and effectively avoids the long chain fracture of the butyl rubber; on the other hand, the ethylene propylene diene monomer rubber tending to physical crosslinking is improved in physical and mechanical properties, and can make up for the small-amplitude performance reduction of the butyl rubber used together. Finally, on a macroscopic scale, a continuously internal mixed butyl rubber/EPDM rubber compound can be obtained which is otherwise essentially identical in terms of properties to the butyl rubber of the segmented batch. In addition, it is found that in a continuous internal mixer, compounding agents such as carbon black are easy to agglomerate and difficult to uniformly disperse into rubber materials, and the rubber materials are processed into rubber particles, so that the uniform dispersion of the compounding agents is facilitated; moreover, the white carbon black has better dispersion effect than the carbon black. It should be noted that, in the rubber reinforcement, the white carbon black is subjected to surface modification, and is generally modified by using a silane coupling agent to enhance the compatibility between the white carbon black and the rubber; the white carbon black and the silane coupling agent can be added at the early stage, and are contacted and reacted in the mixing process. Continuous banburying can improve the efficiency of mixing rubber. Through the improvement to its control system, strengthen the monitoring to the temperature and adjust unloading valve, first feed valve, second feed valve, third feed valve, motor and bleeder valve according to the temperature, can improve the homogeneity of mixed sizing material, and then improve the stability of the tire vulcanization capsule of its production.

Compared with the prior art, the invention has the advantages that,

1) by using the butyl rubber and the ethylene propylene diene monomer, the rubber material used by the tire curing bladder is continuously mixed under tight control by using a continuous internal mixer, the uniformity of the mixed rubber material is high, and the quality stability of the produced tire curing bladder is good;

2) the control system of the continuous banburying process is improved, the monitoring of the temperature is enhanced, and the blanking valve, the first feeding valve, the second feeding valve, the third feeding valve, the motor and the discharge valve are adjusted according to the temperature, so that the system runs smoothly;

3) continuous banburying is carried out continuously in time, and the rubber mixing efficiency and the production efficiency can be improved.

Drawings

FIG. 1 is a schematic diagram of the system architecture and control for continuous compounding of the compounds used in the preparation of tire curing bladders of the present invention;

FIG. 2 is a schematic structural diagram of a continuous internal mixer for continuously mixing rubber materials used for preparing tire curing bladders according to the present invention.

1. The device comprises a heating plate, a conveyor, a rubber block granulator, a continuous internal mixer, a controller, a heat-conducting oil tank, a cooling water tank and a cooling water tank, wherein the heating plate is 2;

301. a discharge valve;

401. a main feed inlet 402, an auxiliary feed inlet 403, an outer shell 404, an inner cylinder 405, a jacket layer 406, a screw 407, a main feed part 408, a first mixing part 409, an auxiliary feed part 410, a second mixing part 411, a discharge part 412, a discharge port 413, a first auxiliary barrel 414, a second auxiliary barrel 415, a third auxiliary barrel 416, a first feed valve 417, a second feed valve 418, a third feed valve 419, a first temperature sensor 420, a second temperature sensor 421, a third temperature sensor 422, a fourth temperature sensor 423, a discharge valve 424 and a motor.

Detailed Description

The following description of the embodiments of the present invention refers to the accompanying drawings and examples:

it should be noted that the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined by the following claims, and all modifications, proportions, changes, and variations of the structures, and dimensions which are within the scope of the present disclosure are not to be considered as limiting the present disclosure.

In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

A preparation method of a tire curing bladder takes butyl rubber and ethylene propylene diene monomer as main rubber materials of the tire curing bladder, realizes continuous mixing of the rubber materials used by the tire curing bladder under tight control, improves mixing uniformity of the rubber materials, and improves quality stability of the prepared tire curing bladder.

The specific technical scheme is a preparation method of a tire curing capsule, wherein in rubber components, 40-60 parts of butyl rubber, 40-60 parts of ethylene propylene diene monomer, 10-30 parts of white carbon black, 1-6 parts of a silane coupling agent, 2-4 parts of brominated phenolic resin, 1-1.5 parts of sulfur, 2-5 parts of zinc oxide, 0-2 parts of stearic acid, 0-3 parts of an anti-aging agent RD1 and 0.5-2 parts of an accelerator TT are adopted.

The preparation method comprises the following steps:

s1, preheating butyl rubber and ethylene propylene diene monomer rubber on a heating plate 1;

s2, conveying the preheated butyl rubber and the ethylene propylene diene monomer rubber to a rubber block granulator 3 by the conveyor 2, and crushing a large rubber block into rubber particles with the particle size of about 20mm by the rubber block granulator 3;

s3, continuously banburying rubber materials:

s31, the controller 5 controls the rubber block granulator 3 to add rubber particles into the main feed inlet 401 of the continuous internal mixer 4, and then adds white carbon black and silane coupling agent into the main feed inlet 401 to perform first-stage mixing;

s32, putting zinc oxide and stearic acid into a first auxiliary material cylinder 413, putting an anti-aging agent RD into a second auxiliary material cylinder 414, putting brominated phenolic resin, sulfur and an accelerator TT into a third auxiliary material cylinder 415, opening a first feeding valve 416, a second feeding valve 417 and a third feeding valve 418 in sequence, and adding the zinc oxide, the stearic acid, the anti-aging agent RD, the brominated phenolic resin, the sulfur and the accelerator TT into the continuous internal mixer 4 through an auxiliary feeding hole 402;

the rubber materials in the S33 and S32 are subjected to two-stage mixing in a continuous internal mixer 4, and then the rubber materials are discharged;

the heating plate 1 is used for preheating the rubber blocks so as to facilitate the processing of the rubber blocks, and the heating plate 1 is positioned at the front end of the conveyor 2;

the conveyor 2 is used for conveying the preheated rubber material to the rubber block granulator 3, and the tail end of the conveyor 2 is positioned above a feeding port of the rubber block granulator 3;

a rubber block granulator 3 for crushing the large rubber blocks into rubber particles with the particle size of about 20mm, wherein a discharge port of the rubber block granulator 3 is positioned above a main feed port 401 of the continuous internal mixer 4;

the continuous internal mixer 4 is a place for sealing and mixing rubber particles and various compounding agents, the interior of a machine barrel can be divided into a main feeding part 407, an auxiliary feeding part 409, a mixing part and a discharging part 411, an oil inlet pipeline and an oil outlet pipeline are connected between an internal screw 406 and a heat-conducting oil tank 6, and an inlet pipe and an outlet pipe are connected between a jacket layer 405 and a cooling water tank 7;

the controller 5 is used for controlling the blanking amount of the rubber block granulator 3 in unit time, the rotating speed of the motor 424, detecting the temperature in the continuous internal mixer 4, controlling the oil temperature of the heat-conducting oil tank 6 and the water temperature of the cooling water tank 7, and controlling the discharging amount of the continuous internal mixer 4, so that the stable operation of the continuous internal mixer 4 is realized;

the heat conduction oil tank 6 is used for introducing heat conduction oil to the screw 406 of the continuous internal mixer 4 to heat the interior of the continuous internal mixer 4 and provide proper temperature for mixing rubber materials;

the cooling water tank 7 is used for introducing cooling water into the jacket layer 405 of the continuous internal mixer 4, so that the continuous internal mixer 4 and the temperature of the rubber material are prevented from being continuously increased, and the rubber material is prevented from being scorched and machine parts are prevented from being aged;

the rubber block granulator 3, the continuous internal mixer 4, the motor 424, the heat-conducting oil tank 6 and the cooling water tank 7 are respectively connected with the controller 5 through circuits.

In the system for continuously mixing the rubber used for preparing the tire curing bladder, a columnar inner cylinder body 404 is arranged inside an outer shell 403 of a continuous internal mixer 4, and a closed jacket layer 405 for cooling water to flow is formed between the inner cylinder body 404 and the outer shell 403; a main feed inlet 401 is arranged at the position close to the discharge port of the rubber block granulator 3 and above the outer shell 403, an auxiliary feed inlet 402 is arranged upwards in the middle of the outer shell 403, and the main feed inlet 401 and the auxiliary feed inlet 402 are respectively communicated with the inside of the inner cylinder 404; a screw 406 is arranged in the inner cylinder 404, the screw 406 is sequentially divided into a main feeding part 407, a first mixing part 408, an auxiliary feeding part 409, a second mixing part 410 and a discharging part 411 from the main feeding port 401 backwards, the main feeding part 407 corresponds to the main feeding port 401, the auxiliary feeding part 409 corresponds to the auxiliary feeding port 402, a discharging port 412 is arranged at the position corresponding to the discharging part 411 and below the outer shell 403, and the discharging port 412 is communicated with the inside of the inner cylinder 404.

In the system for continuously banburying the rubber used for preparing the tire curing bladder, a blanking valve 301 is arranged below a rubber block granulator 3; a first auxiliary material cylinder 413, a second auxiliary material cylinder 414 and a third auxiliary material cylinder 415 are arranged above the auxiliary material inlet 402, and a first feeding valve 416, a second feeding valve 417 and a third feeding valve 418 are correspondingly arranged below the auxiliary material cylinders; a discharge valve 423 is arranged below the discharge port 412;

temperature sensors, namely a first temperature sensor 419, a second temperature sensor 420, a third temperature sensor 421 and a fourth temperature sensor 422 are respectively mounted on the main feeding part 407, the first mixing part 408, the sub-feeding part 409 and the second mixing part 410;

the discharge valve 301, the first feed valve 416, the second feed valve 417, the third feed valve 418, the first temperature sensor 419, the second temperature sensor 420, the third temperature sensor 421, the fourth temperature sensor 422, the motor 424, and the discharge valve 423 are electrically connected to the controller 5, respectively.

In S3, the first temperature sensor 419, the second temperature sensor 420, the third temperature sensor 421, and the fourth temperature sensor 422 detect the temperatures at the main feeding section 407, the first kneading section 408, the sub-feeding section 409, and the second kneading section 410, respectively, and transmit them to the controller 5; the controller 5 adjusts the discharge valve 301, the first feed valve 416, the second feed valve 417, the third feed valve 418, the motor 424, and the discharge valve 423 according to the detected temperature.

In the continuous mixing system, the heating plate 1, the conveyor 2, the gum block granulator 3, the continuous mixer 4, the heat-conducting oil tank 6, the cooling water tank 7 and the controller 5 are all required to be connected with electric power equipment, which is common knowledge in equipment application and will not be described in detail in the invention.

Examples 1 to 6, the formulation of which is shown in Table 1, were continuously mixed by the steps S1 to S4 of the present invention, and the temperature of the continuous mixer was set to 80 to 100 ℃ in which the main feed portion 407, the first kneading portion 408, the sub feed portion 409 and the second kneading portion 410 were set to 80 ℃, 85 ℃, 95 ℃ and 100 ℃ in this order, and the second kneading portion 410 was close to the discharge port 412, and the discharge temperature was considered to be 100 ℃. In the continuous banburying process, when the temperatures detected by the first temperature sensor 419, the second temperature sensor 420, the third temperature sensor 421 and the fourth temperature sensor 422 reach the set values, controlling the temperature of the heat-conducting oil tank 6 to be reduced to 100 ℃ for heat preservation; when the detected temperature exceeds the set value at the position by 3 ℃, the cooling water tank 7 is controlled to supply cooling water to the jacket layer 405 to prevent the temperature of the sizing material from continuously rising; when the detected temperature exceeds the set value of 6 ℃, the heat conducting oil supply is stopped, and cooling water is introduced at the same time, so that the internal temperature of the continuous internal mixer is in a small fluctuation range, the consistency of process parameters is improved, and the rubber materials are ensured to be subjected to continuous internal mixing under the same process conditions. And vulcanizing the continuously internally mixed rubber material on a flat vulcanizing machine, wherein the thickness of the rubber sheet is 4mm, the vulcanization temperature is 170 ℃, the vulcanization time is 20min, and after the rubber sheet is placed for 24h, preparing a sample and carrying out mechanical property test. The test results are shown in Table 2.

Detection standards and equipment:

① Shore hardness, the detection standard GB/T531-2008, and the detection equipment adopts an LX-A hardness tester of Shanghai dangerous Peak film machinery factory.

② tensile property, the detection standard GB/T528-2009, the sample is dumbbell type, the test speed is 500mm/min, the test environment temperature is 23 +/-2 ℃, and the detection equipment adopts GT-TCS-2000 tensile testing machine of Taiwan high-speed rail science and technology Limited.

③ tear strength, the detection standard GB/T529-2008 adopts right-angle sample, the test speed is 500mm/min, the test environment temperature is 23 +/-2 ℃, and the detection equipment adopts GT-TCS-2000 tensile testing machine of Taiwan high-speed railway science and technology Limited.

TABLE 1 formulations of examples 1-6

Table 2 tables of mechanical property test data of films manufactured in examples 1 to 6

From table 2, it can be seen that the film prepared by the technical scheme of the present invention is more stable in tensile strength, elongation at break, tear strength, hardness, etc.

Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.

Claims

1. A method for preparing a tire curing bladder is characterized in that,

the sizing material comprises the following components: butyl rubber, ethylene propylene diene monomer, white carbon black, a silane coupling agent, brominated phenolic resin, sulfur, zinc oxide, stearic acid, an anti-aging agent RD and an accelerator TT;

the preparation method comprises the following steps:

s1, preheating butyl rubber and ethylene propylene diene monomer rubber on a heating plate (1);

s2, conveying the preheated butyl rubber and the ethylene propylene diene monomer rubber to a rubber block granulator (3) by the conveyor (2), and crushing a large rubber block into rubber particles with the particle size of about 20mm by the rubber block granulator (3);

s3, continuously banburying rubber materials:

s31, controlling the rubber block granulator (3) to add rubber particles into a main feeding hole (401) of a continuous internal mixer (4) by a controller (5), and adding white carbon black and a silane coupling agent into the main feeding hole (401) to perform first-stage mixing;

s32, putting zinc oxide and stearic acid into a first auxiliary material cylinder (413), putting an anti-aging agent RD into a second auxiliary material cylinder (414), putting brominated phenolic resin, sulfur and an accelerator TT into a third auxiliary material cylinder (415), opening a first feeding valve (416), a second feeding valve (417) and a third feeding valve (418) in sequence, and adding the zinc oxide, the stearic acid, the anti-aging agent RD, the brominated phenolic resin, the sulfur and the accelerator TT into a continuous internal mixer (4) from an auxiliary feeding hole (402);

the rubber materials in the S33 and S32 are subjected to two-stage mixing in a continuous internal mixer (4), and then the rubber materials are discharged;

the heating plate (1) is used for preheating the rubber blocks and facilitating the processing of the rubber blocks, and the heating plate (1) is positioned at the front end of the conveyor (2);

the conveyor (2) conveys the preheated rubber material to the rubber block granulator (3), and the tail end of the conveyor (2) is positioned above a feeding port of the rubber block granulator (3);

the rubber block granulator (3) is used for crushing the large rubber blocks into rubber particles with the particle size of about 20mm, and a discharge port of the rubber block granulator (3) is positioned above a main feed port (401) of the continuous internal mixer (4);

the continuous internal mixer (4) is a place for sealing and mixing rubber particles and various compounding agents, the interior of a machine barrel can be divided into a main feeding part (407), an auxiliary feeding part (409), a mixing part and a discharging part (411), an oil inlet pipeline and an oil outlet pipeline are connected between an internal screw (406) and a heat-conducting oil tank (6), and a water inlet pipe and a water outlet pipe are connected between a jacket layer (405) and a cooling water tank (7);

the controller (5) is used for controlling the blanking amount of the rubber block granulator (3) in unit time, the rotating speed of the motor (424), the detection of the temperature in the continuous internal mixer (4), the control of the oil temperature of the heat-conducting oil tank (6) and the water temperature of the cooling water tank (7), and the control of the discharging amount of the continuous internal mixer (4), so that the stable operation of the continuous internal mixer (4) is realized;

the heat conduction oil tank (6) is used for introducing heat conduction oil to a screw (406) of the continuous internal mixer (4) to heat the interior of the continuous internal mixer (4) and provide proper temperature for mixing rubber materials;

the cooling water tank (7) is used for introducing cooling water into the jacket layer (405) of the continuous internal mixer (4) to prevent the continuous internal mixer (4) and the rubber material from being heated continuously to cause scorching of the rubber material and aging of machine parts;

the rubber block granulator (3), the continuous internal mixer (4), the motor (424), the heat-conducting oil tank (6) and the cooling water tank (7) are respectively connected with the controller (5) through circuits.

2. The method of claim 1, wherein the tire curing bladder is a tire curing bladder,

the rubber material comprises 40-60 parts of butyl rubber, 40-60 parts of ethylene propylene diene monomer, 10-30 parts of white carbon black, 1-6 parts of silane coupling agent, 2-4 parts of brominated phenolic resin, 1-1.5 parts of sulfur, 2-5 parts of zinc oxide, 0-2 parts of stearic acid, 1-3 parts of anti-aging agent RD, and 0.5-2 parts of accelerator TT.

3. The method of claim 1, wherein the tire curing bladder is a tire curing bladder,

in the system for continuously mixing the rubber used for preparing the tire curing bladder, a columnar inner cylinder body (404) is arranged inside an outer shell (403) of a continuous internal mixer (4), and a closed jacket layer (405) for cooling water to flow is formed between the inner cylinder body (404) and the outer shell (403); a main feed inlet (401) is arranged at a discharge port close to the rubber block granulator (3) and above the outer shell (403), an auxiliary feed inlet (402) is arranged upwards in the middle of the outer shell (403), and the main feed inlet (401) and the auxiliary feed inlet (402) are respectively communicated with the inside of the inner cylinder (404); a screw (406) is arranged in the inner barrel (404), the screw (406) is sequentially divided into a main feeding part (407), a first mixing part (408), an auxiliary feeding part (409), a second mixing part (410) and a discharging part (411) from the main feeding hole (401) to the rear, the main feeding part (407) corresponds to the main feeding hole (401), the auxiliary feeding part (409) corresponds to the auxiliary feeding hole (402), a discharging hole (412) is arranged at the position corresponding to the discharging part (411) and below the outer shell (403), and the discharging hole (412) is communicated with the inside of the inner barrel (404).

4. A method of manufacturing a tire curing bladder according to claim 3,

in the system for continuously banburying the rubber materials used for preparing the tire curing bladder, a blanking valve (301) is arranged below a rubber block granulator (3); a first auxiliary material cylinder (413), a second auxiliary material cylinder (414) and a third auxiliary material cylinder (415) are arranged above the auxiliary material inlet (402), and a first feeding valve (416), a second feeding valve (417) and a third feeding valve (418) are correspondingly arranged below the auxiliary material cylinders; a discharge valve (423) is arranged below the discharge port (412);

temperature sensors are respectively arranged at the main feeding part (407), the first mixing part (408), the auxiliary feeding part (409) and the second mixing part (410), and a first temperature sensor (419), a second temperature sensor (420), a third temperature sensor (421) and a fourth temperature sensor (422) are arranged in sequence;

the blanking valve (301), the first feeding valve (416), the second feeding valve (417), the third feeding valve (418), the first temperature sensor (419), the second temperature sensor (420), the third temperature sensor (421), the fourth temperature sensor (422), the motor (424) and the discharging valve (423) are respectively in circuit connection with the controller (5).

5. The method of claim 4, wherein the tire curing bladder is a single-layer bladder,

in S3, the first temperature sensor (419), the second temperature sensor (420), the third temperature sensor (421), and the fourth temperature sensor (422) detect the temperatures of the main feeding section (407), the first kneading section (408), the sub-feeding section (409), and the second kneading section (410), respectively, and transmit the temperatures to the controller (5); the controller (5) adjusts the discharge valve (301), the first feed valve (416), the second feed valve (417), the third feed valve (418), the motor (424), and the discharge valve (423) according to the detected temperature.