WO2021093101A1 - Method for preparing tire curing bladder - Google Patents

Abstract

The present invention relates to the technical field of preparation of tire curing bladders, and disclosed is a method for preparing a tire curing bladder. Components of the tire curing bladder are butyl rubber, carbon black, white carbon black, aluminum oxide, chloroprene rubber, stearic acid, paraffin, and a curing resin. Plastication and segmented mixing are performed in an internal mixer, then rubber filtering, open milling, tableting, and injection curing are performed to prepare the tire curing bladder, and the speed ratio between rotors in the internal mixer is periodically and alternately changed. Compared with the prior art, the present invention has the beneficial effects that the method for preparing the tire curing bladder is optimally designed, the rotational speed between the first rotor and the second rotor is alternately changed to generate a speed difference, the rubber material mixing effect is improved, the excessive temperature difference is avoided, and the rubber material temperature uniformity is promoted; raw rubber plastication is performed, the raw rubber plasticity is improved, a reinforcing filler is added in a segmented mode, a rubber filtering operation is performed, and the rubber material uniformity is improved; injection curing molding is performed, and finally, the goal of improving the production efficiency and quality of the tire curing bladder is implemented.

Description

Method for preparing tire curing bladder Technical field

The present invention relates to the technical field of preparation of tire curing bladder, in particular to a preparation method of tire curing bladder.

Background technique

The tire vulcanizing bladder is a hollow thin-walled rubber product. It is installed in the tire vulcanizer and used as an inner mold for tire shaping during the tire vulcanization molding process. Fill the tire vulcanizing bladder with superheated water or compressed air and other media to stretch the tire vulcanizing bladder to support the tire rubber blank, which fits the tire lining, and uses the flow and heat transfer characteristics of the fluid inside the tire vulcanizing bladder to maintain the tire The temperature is relatively balanced during the vulcanization process to achieve the effect of uniform vulcanization of the tire and improve the balance performance of the tire.

The tire curing bladder is very important for tire production. The tire curing bladder is repeatedly used for many times under high temperature and high pressure conditions, and it is required to have excellent airtightness, strength, and aging resistance. It is precisely because the tire curing bladder needs to have many characteristics, the research on its preparation process has been In progress. In the rubber mixing stage, an internal mixer is often used. The internal mixer has a pair of specific shaped and relatively rotating rotors that intermittently masticate and mix polymer materials in a closed state with adjustable temperature and pressure. When raw rubber, fillers, and various compounding agents are mixed in the internal mixer, the two rotors rotate relative to each other, and the material from the feeding port is clamped and brought into the roll gap to be squeezed and sheared by the rotor for mixing. According to the speed, the two rotors are divided into synchronous rotor and asynchronous rotor. The synchronous rotor is not as good as the asynchronous rotor in terms of mixing effect. The synchronous rotor requires a long time; while the asynchronous rotor can provide stronger shearing force, and it can plasticize the rubber and The mixing of the compounding agent into the rubber has a promoting effect, which is conducive to uniform mixing and shortening the mixing time; but there is a problem: the temperature of the rubber on the side of the rotor with high rotation speed rises faster than the temperature of the rubber on the side of the rotor with low rotation speed. Speed, under the accumulation of time, the temperature of the rubber on the side of the rotor with high rotation speed will be significantly higher than the temperature of the rubber on the side with the rotor with low rotation speed. The rubber with higher temperature is prone to scorching, which will vulcanize the tire. The quality of the capsules is very unfavorable. Summary of the invention

The present invention provides a method for preparing a tire curing bladder. In the method, the rotational speeds of two rotors in an internal mixer are controlled to solve the above-mentioned technical problems.

The specific technical solution is a method for preparing a tire curing bladder. In the tire curing bladder component, the raw rubber is butyl rubber; the reinforcing filler includes: carbon black, white carbon black and aluminum oxide; the active agent is chlorine Butadiene rubber; processing aids include: stearic acid, paraffin wax; vulcanizing agent is vulcanized resin;

The preparation method includes the following steps:

S1. Add raw rubber to the internal mixer through the upper auxiliary machine, control the first and second rotors in the internal mixer to rotate asynchronously, the temperature in the internal mixer is 100-110℃, and the mixing time is 1-2min;

S2. Add active agent, processing aid and 1/2 reinforcing filler to the internal mixer through the upper auxiliary machine to control the asynchronous rotation of the first and second rotors in the internal mixer, and the temperature in the internal mixer is 100 -110℃, banbury time 1-2min;

S3. Add the remaining 1/2 reinforcing filler to the internal mixer through the upper auxiliary machine, and control the first and second rotors in the internal mixer to rotate asynchronously. The temperature in the internal mixer is 100-110°C. The banburying time is 1-2min, the rubber material is discharged, and the rubber discharge temperature is 100-110℃;

The rubber material discharged in S4 and S3 enters the rubber strainer for rubber filtering, and the discharged rubber material is added to the open mill, and the temperature of the open mill is controlled to 80-90°C. The vulcanizing agent is added and mixed for 2-5 minutes. After that, convey the rubber material in the open mill to the tablet press to press out the film, and park it for more than 24 hours;

S5. Put the S4 film into the injection vulcanizer, the injection temperature is 150-185°C, the vulcanization temperature is 185°C, the vulcanization time is 15-25min, the vulcanization is completed, and the tire curing bladder is taken out;

In S1, S2, and S3, the speed ratio between the first rotor and the second rotor alternately changes from 1: (1-1.25) to (1-1.25):1 according to a time period of 0<t<300s;

The tire curing bladder preparation system used in the preparation method of the tire curing bladder includes:

The upper auxiliary machine is used for weighing materials and auxiliary feeding, and the upper auxiliary machine is located above the internal mixer;

The internal mixer is used for mixing raw rubber, reinforcing fillers, active agents and processing aids. The hopper of the internal mixer is connected to the outlet of the upper auxiliary machine, and the outlet of the internal mixer is connected to the inlet of the rubber filter;

The rubber strainer breaks and disperses the gum beans and the agglomerated filler in the rubber material; the outlet of the rubber strainer is connected with the inlet of the mill;

The open mixer further mixes the rubber material;

The tablet press presses the irregular rubber material into flakes, and the inlet of the tablet press is connected with the outlet of the open mill;

The injection vulcanizing machine is used to heat and inject the film into the mold cavity to shape and vulcanize;

The upper auxiliary machine, internal mixer, rubber strainer, open mill, tablet press and injection vulcanizing machine are respectively connected with the controller. The upper auxiliary machine, internal mixer, rubber strainer, open mixer, tablet press and controller are connected to electrical power equipment during use. This is common knowledge in equipment application and will not be described in detail in the present invention.

Further, 100 parts of raw rubber, 30-60 parts of reinforcing fillers, 6-8 parts of active agents, 3-5 parts of processing aids, and 2-6 parts of vulcanizing agents.

Further, in the reinforcing filler, the ratio of carbon black, white carbon black and aluminum oxide is (8-12): (1-2):1.

Furthermore, in the processing aid, the ratio of stearic acid and paraffin wax is 1:(1-2).

Further, the speed of the first rotor and the second rotor change with time in a positive half-wave alternately, and the waveform is one of a sine wave, a triangular wave, a rectangular wave, or a trapezoidal wave.

Further, the mixing time between S1, S2 and S3 is equal, and the time period during which the rotation speed ratio between the first rotor and the second rotor alternately changes is equal to the mixing time of step S1.

Further, in S1, the rotation speed of the first rotor in the internal mixer: the rotation speed of the second rotor is (1-1.25):1; in S2, the rotation speed of the second rotor in the internal mixer: the rotation speed of the first rotor is (1-1.25):1; In S3, the speed of the first rotor in the internal mixer: the speed of the second rotor is (1-1.25):1.

Further, in S1, the speed of the first rotor in the internal mixer: the speed of the second rotor is (1-1.10):1; in S2, the speed of the second rotor in the internal mixer: the speed of the first rotor is (1-1.10):1; In S3, the speed of the first rotor in the internal mixer: the speed of the second rotor is (1-1.10):1.

Further, in S1, the rotation speed of the second rotor in the internal mixer: the rotation speed of the first rotor is (1-1.25):1; in S2, the rotation speed of the first rotor in the internal mixer: the rotation speed of the second rotor is (1-1.25):1; In S3, the speed of the second rotor in the internal mixer: the speed of the first rotor is (1-1.25):1.

Further, the internal mixer in the tire curing bladder preparation system has an external mixer outer shell, an internal mixing chamber, and a first rotor and a second rotor inside the internal mixing chamber, and above the internal mixing chamber The upper bolt, the middle of the upper bolt is a hollow cavity, and the upper bolt control rod is rigidly connected to the lower hammer inside the bottom; the middle side of the upper bolt is opened with an upward hopper, and the bottom of the mixing chamber has Discharge valve, a discharge gate is provided on the outer shell of the internal mixer, which is located on the side close to the rubber strainer;

The front end of the rubber strainer is a gear pump. The gear pump has a first gear and a second gear that mesh with each other. The gear pump has a revolving door on the side close to the internal mixer, and a discharge on the side far from the internal mixer. The discharge port is connected to the discharge pipe, and a filter screen is installed inside the discharge pipe.

In the present invention, in S1, there is a speed difference between the first rotor and the second rotor, which can provide a larger shear force to masticate the raw rubber, and the mastication increases the plasticity of the butyl rubber, which is beneficial to the subsequent Mixing of active agent, processing aid and 1/2 reinforcing filler. In S2, there is a speed difference between the first rotor and the second rotor, which can provide a relatively large shear force, which facilitates the mixing of active agents, processing aids and 1/2 reinforcing fillers into the raw rubber. In S3, there is a speed difference between the first rotor and the second rotor, which can provide a larger shear force, which is conducive to dispersing the remaining 1/2 reinforcing filler into the rubber material, improving the mixing effect and shortening the mixing Time is conducive to improving overall production efficiency and product quality.

Among them, mixing is to mix the raw rubber and various compounding agents together through the rubber equipment according to the proportion of the compounding agent specified in the rubber formula, and make the various compounding agents uniformly dispersed in the raw rubber. The purpose of compound mixing is to obtain uniform physical and mechanical performance indicators and meet the compound performance indicators specified by the formula, so as to facilitate the next process operation and ensure the quality of the finished product.

It should be noted that when the speed of the first rotor is faster in S1, the temperature of the raw rubber near the first rotor rises faster, and the temperature of raw rubber in the mixing chamber is not uniform; in S2 The speed of the second rotor is faster, so that the temperature of the rubber material close to the second rotor rises faster, which can reduce the temperature difference or overshoot in S1; in S3, the speed of the first rotor is faster, and in S2, the temperature The slow-rising rubber material starts to heat up rapidly, and continues to reduce the temperature unevenness between the rubber materials. The speed ratio between the first rotor and the second rotor is constantly adjusted and changed. While increasing the shear force, it is helpful to promote the uniform temperature of the rubber compound; avoiding the temperature of a certain part of the rubber compound under a single speed ratio The phenomenon of scorching and large temperature difference between the rubber materials occurs when the temperature rises too fast.

S4 is used to filter the rubber, and the agglomerated, undispersed compounding agent and carbon black are forced to disperse, which can promote the uniformity of the rubber; the filter needs to be cleaned regularly. The control of temperature parameters in the rubber mixing and vulcanization process is closely related to the formula itself and the process steps; the preparation method of the present invention can realize the uniform mixing of the rubber compound in a relatively short time, and the temperature rise tends to be uniform, and can improve the tire curing bladder Production efficiency and quality.

Compared with the prior art, the beneficial effects of the present invention,

1) Optimize the design of the preparation method of the tire curing bladder, control the rotation speed between the first rotor and the second rotor in the internal mixer to alternately produce a speed difference, improve the mixing effect of the rubber, and avoid excessive temperature differences. Promote the uniform temperature of the rubber material and shorten the mixing time;

2) In the internal mixer, the raw rubber is plasticized to increase the plasticity of the butyl rubber, which is conducive to the subsequent mixing of active agents, processing aids and reinforcing fillers;

3) The stepwise addition of reinforcing fillers and rubber filtering operations can improve mixing efficiency and increase its uniformity; injection vulcanization of the rubber material will ultimately achieve the goal of improving the production efficiency and quality of the tire curing bladder.

Description of the drawings

Figure 1 is a schematic structural diagram of a tire curing bladder preparation system of a method for preparing a tire curing bladder in the present invention;

Figure 2 is a schematic diagram of the internal mixer structure of a method for preparing a tire curing bladder in the present invention;

Figure 3 is a schematic diagram of the structure of a rubber strainer of a method for preparing a tire curing bladder in the present invention;

4 is a schematic diagram of the state between the internal mixer and the rubber strainer in a method for preparing a tire curing bladder according to the present invention;

5 is a schematic speed-time diagram of the first rotor in Embodiment 1;

6 is a schematic speed-time diagram of the second rotor in Embodiment 1;

Figure 7 is a schematic speed-time diagram of the first rotor in Embodiment 2;

8 is a schematic speed-time diagram of the second rotor in Embodiment 2;

9 is a schematic speed-time diagram of the first rotor in Embodiment 3;

10 is a schematic speed-time diagram of the second rotor in Embodiment 3;

11 is a schematic speed-time diagram of the first rotor in Embodiment 4;

FIG. 12 is a schematic speed-time diagram of the second rotor in Embodiment 4. FIG.

1. Upper auxiliary machine, 2. Internal mixer, 3. Rubber strainer, 4. Open mill, 5. Tablet press, 6. Controller, 7. Injection vulcanizing machine;

201. Internal mixer housing, 202, mixing chamber, 203, first rotor, 204, second rotor, 205, upper bolt, 206, upper bolt lever, 207, lower hammer, 208, charging hopper , 209, discharge valve, 210, discharge gate;

301, gear pump, 302, first gear, 303, second gear, 304, revolving door, 305, discharge port, 306, discharge pipe, 307, filter screen.

Detailed ways

The specific implementation of the present invention will be described below with reference to the drawings and embodiments:

It should be noted that the structure, ratio, size, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification for the understanding and reading of those familiar with this technology, and are not intended to limit the implementation of the present invention. The limiting conditions, any structural modification, proportional relationship, change or size adjustment, shall fall within the scope of the technical content disclosed in the present invention without affecting the effects and objectives that can be achieved by the present invention In the range.

At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for ease of description, not to limit the text. The scope of implementation of the invention, the change or adjustment of its relative relationship, without substantial changes to the technical content, shall also be regarded as the scope of implementation of the invention.

1-12, a method for preparing tire curing bladder, the tire curing bladder components, 100 parts of butyl rubber, 24-48 parts of carbon black, 3-8 parts of white carbon black, 2 aluminum oxide -6 parts, 6-8 parts of chloroprene rubber, 1-2.5 parts of stearic acid, 1.5-3.4 parts of paraffin wax, 2-6 parts of vulcanized resin.

The preparation method includes the following steps:

S1. The raw rubber is added to the internal mixer 2 through the upper auxiliary machine 1, and the first rotor 203 and the second rotor 204 in the internal mixer 2 are controlled to rotate asynchronously. The temperature in the internal mixer 2 is 100-110°C. Time 1-2min;

S2. Add the active agent, processing aid and 1/2 reinforcing filler to the internal mixer 2 through the upper auxiliary machine 1, and control the first rotor 203 and the second rotor 204 in the internal mixer 2 to rotate asynchronously, and the internal mixer The temperature in machine 2 is 100-110℃, and the mixing time is 1-2min;

S3. Add the remaining 1/2 reinforcing filler to the internal mixer 2 through the upper auxiliary machine 1, and control the first rotor 203 and the second rotor 204 in the internal mixer 2 to rotate asynchronously, and the temperature in the internal mixer 2 It is 100-110℃, banbury time is 1-2min, the rubber material is discharged, and the glue discharge temperature is 100-110℃;

The rubber material discharged in S4 and S3 enters the rubber filter 3 for rubber filtering, and the discharged rubber material is added to the open mill 4, and the temperature of the open mill 4 is controlled to 80-90°C. The vulcanizing agent is added and mixed After 2-5 minutes, convey the rubber material in the open mill 4 to the tablet press 5 to press out the film, and park it for more than 24 hours;

S5. Put the S4 film into the injection vulcanizer 7, the injection temperature is 150-185°C, the vulcanization temperature is 185°C, and the vulcanization time is 15-25min. After the vulcanization is completed, take out the tire curing bladder;

In S1, S2, and S3, the rotation speed ratio between the first rotor 203 and the second rotor 204 alternately changes from 1:1-1.25 to 1-1.25:1 in a time period of 0<t<300s.

The tire curing bladder preparation system used in the preparation method of the tire curing bladder includes:

The upper auxiliary machine 1 is used for weighing materials and auxiliary feeding, and the upper auxiliary machine 1 is located above the internal mixer 2;

The internal mixer 2 is used for mixing raw rubber, reinforcing fillers, active agents and processing aids. The hopper 208 of the internal mixer 2 is connected to the outlet of the upper auxiliary machine 1, and the outlet of the internal mixer 2 is connected to the rubber filter Inlet connection of machine 3;

The rubber strainer 3 breaks and disperses the gum beans and the agglomerated filler inside the rubber material; the outlet of the rubber strainer 3 is connected with the inlet of the mill 4;

The open mixer 4 further mixes the rubber;

The tablet press 5 compresses the irregular rubber material into flakes, and the inlet of the tablet press 5 is connected with the outlet of the mill 4;

The injection vulcanizing machine 7 is used to heat the film, heat and inject it into the mold cavity to shape and vulcanize;

The upper auxiliary machine 1, the internal mixer 2, the rubber strainer 3, the open mill 4, the tablet press 5 and the injection vulcanizing machine 7 are respectively connected to the controller 6. The upper auxiliary machine, internal mixer, rubber strainer, open mixer, tablet press and controller are connected to electrical power equipment during use. This is common knowledge in equipment application and will not be described in detail in the present invention.

The rotation speed of the second rotor 204 in the internal mixer 2: the rotation speed of the first rotor 203 is 1-1.25:1; in S2, the rotation speed of the first rotor 203 in the internal mixer 2: the rotation speed of the second rotor 204 is 1 -1.25:1; In S3, the rotation speed of the second rotor 204 in the internal mixer 2: the rotation speed of the first rotor 203 is 1-1.25:1.

Further, the internal mixer 2 in the tire curing bladder preparation system has an external mixer housing 201 on the outside, a mixing chamber 202 inside, and a first rotor 203 and a second rotor 204 inside the mixing chamber 202. There is an upper bolt 205 above the mixing chamber 202, a hollow cavity in the middle of the upper bolt 205, and an upper bolt control rod 206 rigidly connected to the lower hammer 207 at the bottom; the middle side of the upper bolt 205 is opened A hopper 208 with upward opening, a discharge valve 209 at the bottom of the internal mixing chamber 202, a discharge door 210 is provided on the external mixer housing 201, and the discharge door 210 is located on the side close to the rubber strainer 3;

The front end of the rubber strainer 3 is a gear pump 301. The gear pump 301 has a first gear 302 and a second gear 303 that mesh with each other. The side of the gear pump 301 close to the internal mixer 2 is provided with a revolving door 304. A discharge port 305 is provided on one side of the machine 2, the discharge port 305 is connected to a discharge pipe 306, and a filter 307 is installed inside the discharge pipe 306.

The formulations of Examples 1-4 are shown in Table 1, in parts by weight. The preparation steps and the used tire curing bladder preparation system refer to the technical scheme of the present invention, and the process conditions in the preparation steps are different.

Table 1 Formulations of Examples 1-4

To	Example 1	Example 2	Example 3	Example 4
Butyl rubber/part	100	100	100	100
Carbon black/part	twenty four	twenty four	48	48
White carbon black/part	3	4	6	8
Aluminum oxide/part	3	2	6	4
Stearic acid/part	1	1.5	1.6	2
Paraffin/part	2	1.5	3.2	3
Vulcanized resin/part	2	2	4	6
Neoprene/part	6	6	7	8

In Embodiment 1, the mixing time between S1, S2 and S3 is equal, and the time period during which the rotation speed ratio between the first rotor 203 and the second rotor 204 alternately changes is equal to the mixing time of step S1. In S1, the rotation speed of the first rotor 203 in the internal mixer 2: the rotation speed of the second rotor 204 is 1-1.25:1; in S2, the rotation speed of the second rotor 204 in the internal mixer 2: the rotation speed of the first rotor 203 The speed is 1-1.25:1; in S3, the speed of the first rotor 203 in the internal mixer 2: the speed of the second rotor 204 is 1-1.25:1. The speed of the first rotor 203 and the second rotor 204 change with time in a positive half-wave alternately, the waveform is a triangular wave, and the speed change between the two is exactly half a time period.

In Figures 5 and 6, v1 is the minimum speed, v2 is the maximum speed, and v2 is 1.25 times of v1. Between t0-t1, the speed of the first rotor 203 accelerates from v1 to v2, and then from v2 to v1; the speed of the second rotor 204 is always v1; between t1-t2, the speed of the first rotor 203 is always Is v1, the speed of the second rotor 204 accelerates from v1 to v2, and then from v2 to v1; the following t2-t4 and t0-t2 speed changes are the same, t0-t2 is a time period; the first rotor 203 and the first The rotation speed ratio between the two rotors 204 presents a periodic alternating change, and the time period t0-t2 is exactly the same as the S1 banburying time, which is 2 min.

Embodiment 2: The mixing time between S1, S2 and S3 is equal, and the time period during which the rotation speed ratio between the first rotor 203 and the second rotor 204 alternately changes is equal to the mixing time of step S1. In S1, the rotation speed of the second rotor 204 in the internal mixer 2: the rotation speed of the first rotor 203 is 1.10:1; in S2, the rotation speed of the first rotor 203 in the internal mixer 2: the rotation speed of the second rotor 204 is 1.10:1; in S3, the rotation speed of the second rotor 204 in the internal mixer 2: the rotation speed of the first rotor 203 is 1.10:1. The speed of the first rotor 203 and the second rotor 204 change with time in a positive half-wave alternately, and the waveform is a rectangular wave. At this time, the difference between v1 and v2 should not be too large, and the speed change between the two is exactly half a difference Time period.

In Figures 7 and 8, v1 is the minimum speed, v2 is the maximum speed, and v2 is 1.10 times that of v1. Between t0-t1, the speed of the first rotor 203 is always v1, and the speed of the second rotor 204 is always v2; between t1 and t2, the speed of the first rotor 203 is always v2, and the speed of the second rotor 204 It is always v1; the following t2-t4 and t0-t2 speed changes are the same, the speed ratio between the first rotor 203 and the second rotor 204 presents a periodic alternate change, and the time period t0-t2 coincides with the S1 mixing time It is equal to 2min.

Embodiment 3: The speed of the first rotor 203 and the second rotor 204 change with time in a positive half wave alternately, the waveform is a sine wave, and the speed change between the two is exactly half a time period.

In Figure 9 and Figure 10, v1 is the minimum speed, v2 is the maximum speed, and v2 is 1.25 times of v1. Between t0-t1, the speed of the first rotor 203 is always v1, and the speed of the second rotor 204 accelerates from v1 to v2, and then from v2 to v1; between t1-t2, the speed of the first rotor 203 changes from v1 accelerates to v2, and then from v2 to v1, the speed of the second rotor 204 is always v1; the following t2-t4 and t0-t2 have the same speed change, t0-t2 is a time period; the first rotor 203 and the first rotor 203 The rotation speed ratio between the two rotors 204 presents a periodic alternate change, and the time period is 1 min.

Embodiment 4: The speed of the first rotor 203 and the second rotor 204 change with time in a positive half-wave alternately, the waveform is a trapezoidal wave, and the speed change between the two is exactly 1/4 time period.

In Figure 11 and Figure 12, v1 is the minimum speed, v2 is the maximum speed, and v2 is 1.25 times of v1. Between t0-t1, the speed of the first rotor 203 is always v2, and the speed of the second rotor 204 is always v1; between t1 and t2, the speed of the first rotor 203 decreases from v2 to v1, and the second rotor 204 The speed accelerates from v1 to v2; between t2-t3, the speed of the first rotor 203 is always v1, and the speed of the second rotor 204 is always v2; between t3-t4, the speed of the first rotor 203 is from v1 accelerates to v2, and the speed of the second rotor 204 decreases from v2 to v1; the following t4-t5 changes the same speed as t0-t1, and a new cycle starts; t0-t4 is a time period; the first rotor 203 and the first rotor 203 The rotation speed ratio between the two rotors 204 presents a periodic and alternate change, and the time period is 4 min.

The film prepared according to the method of Examples 1-4 was vulcanized on a plate vulcanizer, the film thickness was 4mm, the vulcanization temperature was 185°C, the vulcanization time was 20min, and after 24h, samples were prepared and the mechanical properties were tested.

Testing standards and equipment:

①Shore hardness: testing standard GB/T531-2008; testing equipment adopts LX-A hardness tester from Shanghai Xianfeng Film Machinery Factory.

②Tensile performance: testing standard GB/T528-2009, the sample is dumbbell-shaped, testing speed is 500mm/min, testing environment temperature is 23±2℃; testing equipment adopts GT-TCS-2000 of Taiwan High Speed Rail Technology Co., Ltd. Tensile testing machine.

③Tear strength: testing standard GB/T529-2008, using right-angled specimens, testing speed 500mm/min, testing environment temperature 23±2℃; testing equipment adopts GT-TCS-2000 of Taiwan High Speed Rail Technology Co., Ltd. Tensile testing machine.

The test results are shown in Table 2.

Table 2 Test data table of mechanical properties of films produced in Examples 1-4

It can be seen from Table 2 that the film prepared by the technical scheme of the present invention has excellent properties such as tensile strength, elongation at break, and tear strength; it shows that the technical scheme of the present invention has good rubber mixing effect. , The rubber material is uniform, and tire curing bladder with better mechanical properties can be prepared.

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

Claims (10)

1. A method for preparing a tire curing bladder. The components of the tire curing bladder include: raw rubber, reinforcing filler, active agent, processing aid, and curing agent, characterized in that:

   In the tire curing bladder component, the raw rubber is butyl rubber; the reinforcing filler includes: carbon black, white carbon black and aluminum oxide; the active agent is neoprene; the processing aid includes: stearic acid, paraffin wax ; The vulcanizing agent is a vulcanized resin;

   The preparation method includes the following steps:

   S1. Add raw rubber to the internal mixer (2) through the upper auxiliary machine (1), control the first rotor (203) and the second rotor (204) in the internal mixer (2) to rotate asynchronously, and the internal mixer ( 2) The medium temperature is 100-110℃, and the banburying time is 1-2min;

   S2. Add the active agent, processing aid and 1/2 reinforcing filler to the internal mixer (2) through the upper auxiliary machine (1), and control the first rotor (203) and the first rotor (203) in the internal mixer (2) The second rotor (204) rotates asynchronously, the temperature in the internal mixer (2) is 100-110℃, and the mixing time is 1-2min;

   S3. Add the remaining 1/2 reinforcing filler to the internal mixer (2) through the upper auxiliary machine (1), and control the first rotor (203) and the second rotor (204) in the internal mixer (2) ) Asynchronous rotation, the temperature in the internal mixer (2) is 100-110℃, the mixing time is 1-2min, the rubber material is discharged, and the rubber discharge temperature is 100-110℃;

   The rubber material discharged in S4 and S3 enters the rubber filter (3) for rubber filtering, and the discharged rubber material is added to the open mill (4), and the temperature of the open mill (4) is controlled to 80-90°C, After adding vulcanizing agent and mixing for 2-5 minutes, transport the rubber material in the open mill (4) to the tablet press (5) to press out the film, and then park for more than 24 hours;

   S5. Put the S4 film into the injection vulcanizing machine (7), the injection temperature is 150-185°C, the vulcanization temperature is 185°C, the vulcanization time is 15-25min, the vulcanization is completed, and the tire curing bladder is taken out;

   In S1, S2, and S3, the speed ratio between the first rotor (203) and the second rotor (204) is 1: (1-1.25) to (1-1.25) according to a time period of 0<t<300s: 1 alternately;

   The tire curing bladder preparation system used in the preparation method of the tire curing bladder includes:

   The upper auxiliary machine (1) is used for weighing materials and auxiliary feeding, and the upper auxiliary machine (1) is located above the internal mixer (2);

   The internal mixer (2) is used for mixing raw rubber, reinforcing fillers, active agents and processing aids. The feeding hopper (208) of the internal mixer (2) is connected to the outlet of the upper auxiliary machine (1). The outlet of the mixing mill (2) is connected with the inlet of the rubber strainer (3);

   The rubber strainer (3) crushes and disperses the gum beans and agglomerated filler inside the rubber compound; the outlet of the rubber strainer (3) is connected with the inlet of the mill (4);

   The open mixer (4) further mixes the rubber;

   The tablet press (5) compresses the irregular rubber material into flakes, and the inlet of the tablet press (5) is connected with the outlet of the open mill (4);

   The injection vulcanizing machine (7) is used to heat the film, heat and inject it into the mold cavity to shape and vulcanize;

   The upper auxiliary machine (1), internal mixer (2), rubber filter (3), open mill (4), tablet press (5) and injection vulcanizer (7) are respectively connected with the controller (6).
2. The method for preparing a tire curing bladder according to claim 1, wherein 100 parts of raw rubber, 30-60 parts of reinforcing fillers, 6-8 parts of active agents, 3-5 parts of processing aids, vulcanization Agent 2-6 parts.
3. The method for preparing a tire curing bladder according to claim 2, wherein in the reinforcing filler, the ratio of carbon black, white carbon black and aluminum oxide is (8-12): ( 1-2):1.
4. The method for preparing a tire curing bladder according to claim 2, characterized in that, in the processing aid, the ratio of stearic acid and paraffin wax is 1: (1-2).
5. The method for preparing a tire curing bladder according to claim 1, wherein the speed of the first rotor (203) and the second rotor (204) change with time in a positive half-wave alternately, and the waveform is a sine wave, One of triangular wave, rectangular wave or trapezoidal wave.
6. The method for preparing a tire curing bladder according to claim 5, characterized in that the mixing time between S1, S2 and S3 is equal, and the rotation speed between the first rotor (203) and the second rotor (204) The time period during which the ratio alternately changes is equal to the banburying time in step S1.
7. The method for preparing a tire curing bladder according to claim 6, characterized in that, in S1, the speed of the first rotor (203) in the internal mixer (2): the speed of the second rotor (204) is ( 1-1.25):1; in S2, the rotation speed of the second rotor (204) in the internal mixer (2): the rotation speed of the first rotor (203) is (1-1.25):1; in S3, the internal mixer The rotation speed of the first rotor (203) in (2): the rotation speed of the second rotor (204) is (1-1.25):1.
8. The method for preparing a tire curing bladder according to claim 7, characterized in that, in S1, the rotation speed of the first rotor (203) in the internal mixer (2): the rotation speed of the second rotor (204) is ( 1-1.10):1; in S2, the speed of the second rotor (204) in the internal mixer (2): the speed of the first rotor (203) is (1-1.10):1; in S3, the internal mixer The rotation speed of the first rotor (203) in (2): the rotation speed of the second rotor (204) is (1-1.10):1.
9. The method for preparing a tire curing bladder according to claim 6, characterized in that, in S1, the rotation speed of the second rotor (204) in the internal mixer (2): the rotation speed of the first rotor (203) is ( 1-1.25):1; in S2, the speed of the first rotor (203) in the internal mixer (2): the speed of the second rotor (204) is (1-1.25):1; in S3, the internal mixer The rotation speed of the second rotor (204) in (2): the rotation speed of the first rotor (203) is (1-1.25):1.
10. The method for preparing a tire curing bladder according to claim 1, wherein:

    The internal mixer (2) in the tire curing bladder preparation system has an external mixer outer shell (201), an internal mixing chamber (202), and a first rotor (203) inside the internal mixing chamber (202). ) And the second rotor (204), above the mixing chamber (202) there is an upper top bolt (205), the middle of the upper top bolt (205) is a hollow cavity, and the bottom is rigidly connected to the lower hammer (207) inside The upper bolt control rod (206) of the upper bolt (205) is opened with an upward hopper (208) on the middle side of the upper bolt (205), and there is a discharge valve (209) at the bottom of the mixing chamber (202). A discharge door (210) is provided on the outer casing (201) of the machine, and the discharge door (210) is located on the side close to the rubber strainer (3);

    The front end of the rubber strainer (3) is a gear pump (301). The gear pump (301) has a first gear (302) and a second gear (303) that mesh with each other. The gear pump (301) is close to the internal mixer (2). ) Is provided with a revolving door (304), on the side far from the internal mixer (2) is provided with a discharge port (305), the discharge port (305) is connected to a discharge pipe (306), and a discharge pipe A filter screen (307) is installed inside (306).

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