Mixer, device and mixing method for continuous production of natural rubber wet mixing

Abstract

The invention relates to a mixer, device and mixing method for wet mixing continuous production of natural rubber, wherein the mixer comprises a narrow flow chamber and a carbon black slurry jet pipe; the narrow flow chamber comprises an inner retaining ring and an outer retaining ring; the inner retaining ring is a conical hollow structure, the size of the top opening is larger than the bottom opening; the outer retaining ring is a conical hollow structure, the size of the top opening is larger than the bottom opening, and the ring is arranged outside the inner retaining ring, and a narrow flow cavity is formed between the inner wall and the outer wall of the inner retaining ring; latex in a high-pressure state can flow into the narrow flow cavity from between the inner wall of the top end of the outer retaining ring and the outer wall of the top end of the inner retaining ring, and flow out of the narrow flow cavity in the form of a first water curtain of a conical hollow structure; the axis of the carbon black slurry jet pipe is vertically arranged, and a jet part is arranged at the bottom; the jet part is arranged inside the inner retaining ring; the carbon black slurry in a high-pressure state flows into the carbon black slurry jet pipe from the top end of the carbon black slurry jet pipe, and a second water curtain of a conical structure is sprayed from the jet part to the bottom of the inner retaining ring.

Description

Technical Field

[0001] The invention relates to the technical field of natural rubber wet mixing, and in particular to a mixer, a device and a mixing method for natural rubber wet mixing continuous production. Background Art

[0002] Natural rubber wet mixing technology is an emerging mixing technology. Fillers such as carbon black are made into a water dispersion system and fully mixed with natural rubber latex. After coagulation, dehydration and drying, rubber compound is obtained. Compared with dry mixing technology that uses physical mechanical shear force for mixing, the energy consumption required for mixing is reduced and the dispersion is more uniform. The tire formed by the compound obtained by wet mixing has the characteristics of high wear resistance and low rolling resistance.

[0003] The wet mixing process is mainly achieved in the following ways:

[0004] The first method is to place the latex and carbon black slurry in the same container, stir them with a stirrer, and add a demulsifier to flocculate into a composite masterbatch.

[0005] The second method is to deliver latex to the first input end of the three-way pipe reactor, deliver carbon black slurry to the second input end, and deliver other rubber compounding systems to the third input end. The high-speed jet of carbon black slurry and the high-speed jet of latex collide with each other at the output end of the three-way pipe reactor to destroy the emulsifier layer of the latex, and blend the carbon black slurry with the demulsified latex to flocculate into a composite masterbatch. This method can not only ensure the rhythm of continuous production, but also improve the dispersion uniformity.

[0006] The third method is to add a spiral structure at the output end of the three-way pipe reactor to mix the advancing carbon black slurry and the advancing latex to form flocculation, and increase the stroke of the flocculation, so that the carbon black slurry and latex are blended and flocculated into a composite masterbatch. It can also ensure the rhythm of continuous production and improve the uniformity of dispersion. However, there is a large difference in the collision conditions between the surface and inner layers of the carbon black slurry jet and the latex jet, which makes the effective collision volume insufficient, and thus the mixing effect and dispersion degree still cannot meet the needs.

[0007] Therefore, how to further increase the effective collision volume of carbon black slurry and latex while ensuring the production rhythm, so as to further improve the mixing effect and dispersion degree has become a technical problem to be solved urgently in this field. Summary of the invention

[0008] Wet mixing is a technology for combining rubber and carbon black at a microscopic level. The microscopic mixing difference will directly affect the effect of rubber mixing. In order to solve the problem that when the carbon black slurry jet and the latex flow collide with each other, there is a large difference in the collision between the jet surface and the inner layer at the microscopic level, and the effective collision volume is insufficient in the existing technical solution, the present invention provides a mixer, device and mixing method for continuous production of natural rubber wet mixing.

[0009] To achieve the purpose of the present invention, a mixer for wet mixing and continuous production of natural rubber is provided, comprising a narrow flow chamber and a carbon black slurry jet pipe;

[0010] The narrow flow chamber includes an inner retaining ring and an outer retaining ring;

[0011] The inner retaining ring is a conical hollow structure, the axis is vertically arranged, and the top opening size is larger than the bottom opening size;

[0012] The outer retaining ring is a conical hollow structure, the axis is vertically arranged, the top opening size is larger than the bottom opening size, and the ring is arranged outside the inner retaining ring, and a narrow flow cavity is formed between the inner wall and the outer wall of the inner retaining ring; the latex in a high-pressure state can flow into the narrow flow cavity from between the inner wall of the top end of the outer retaining ring and the outer wall of the top end of the inner retaining ring, and flow out of the narrow flow cavity in the form of a first water curtain of the conical hollow structure;

[0013] The axis of the carbon black slurry jet pipe is arranged vertically, and a jet part is arranged at the bottom; the jet part is arranged inside the inner retaining ring; the carbon black slurry in a high-pressure state flows into the carbon black slurry jet pipe from the top of the carbon black slurry jet pipe, and the second water curtain of the conical structure is sprayed from the jet part to the bottom of the inner retaining ring.

[0014] In some specific embodiments, the spraying portion is a spiral nozzle, which can spray a second water curtain with a conical hollow structure directly below the inner retaining ring.

[0015] In some specific embodiments, the angle between the side wall of the inner retaining ring and the vertical direction is 30°-60°;

[0016] The included angle between the side wall of the outer retaining ring and the vertical direction is also 30°-60°.

[0017] In some of the specific embodiments, a condensation chamber is further included;

[0018] The condensation chamber is hollow, with a condensation cavity inside, and the top end is fixedly connected to the bottom end of the outer retaining ring;

[0019] The condensation chamber is communicated with the injection portion and the narrow flow chamber respectively.

[0020] In some of the specific embodiments, a buffer chamber is further included;

[0021] The buffer chamber comprises an inner liner and an outer sleeve;

[0022] The inner liner is hollow, the axis is vertically arranged, and the bottom end is connected and communicated with the top end of the inner retaining ring;

[0023] The outer sleeve is hollow, the axis is vertically arranged, the cover is arranged outside the inner sleeve, the bottom end is connected and communicated with the top end of the outer retaining ring, a buffer cavity is formed between the inner wall and the outer wall of the inner sleeve, and a liquid inlet is arranged on one side;

[0024] The buffer cavity is connected with the narrow flow cavity; the latex in a high-pressure state flows through the liquid inlet and the buffer cavity in sequence, and then flows into the narrow flow cavity.

[0025] In some specific embodiments, an upper connecting ring is provided at the top end of the buffer chamber, and a lower connecting ring is provided at the bottom end;

[0026] The inner side of the upper connecting ring is fixedly connected to the top of the inner liner, and the outer side is fixedly connected to the top of the outer sleeve;

[0027] The inner side of the lower connecting ring is fixedly connected to the top end of the outer retaining ring, and the outer side is fixedly connected to the bottom end of the outer sleeve.

[0028] A natural rubber latex wet mixing continuous production device based on the same concept, comprising a carbon black slurry storage pressure tank, a carbon black slurry flow valve, a carbon black slurry delivery pipe, a carbon black slurry booster pump, a latex storage pressure tank, a latex flow valve, a latex delivery pipe, a latex booster pump and a mixer provided by any of the above specific embodiments;

[0029] The carbon black slurry storage pressure tank, the carbon black slurry flow valve, the carbon black slurry delivery pipe, the carbon black slurry booster pump and the top end of the carbon black slurry jet pipe are connected in sequence;

[0030] The mixer includes a buffer chamber;

[0031] The latex storage pressure tank, the latex flow valve, the latex delivery pipe, the latex booster pump and the buffer chamber are connected in sequence.

[0032] A mixing method for continuous production of natural rubber latex wet mixing based on the same conception comprises the following steps:

[0033] The narrow flow chamber allows the latex in a high pressure state to flow out in the form of a first water curtain with a conical hollow structure;

[0034] The carbon black slurry jet pipe causes the carbon black slurry in a high pressure state to flow out in the first water curtain in the form of a second water curtain with a conical structure, and to counteract the first water curtain to demulsify the latex; the demulsified latex is mixed with the carbon black slurry to form a composite masterbatch A.

[0035] In some specific embodiments, the following steps are also included:

[0036] A buffer chamber is used to store latex before the narrow flow chamber allows the high-pressure latex to flow out in the form of a first water curtain in a conical hollow structure;

[0037] After the demulsified latex and the carbon black slurry form a composite masterbatch A, the composite masterbatch A collides in a coagulation chamber to form a composite masterbatch B.

[0038] In some specific embodiments, the mass percentage concentration of the latex forming the first water curtain is 5%-60%, and the required pressure is 0.1Mpa-10Mpa;

[0039] The mass percentage concentration of the carbon black slurry forming the second water curtain is 1%-10%, and the required pressure is above 1Mpa.

[0040] Beneficial effects of the present invention: The mixer for continuous production of wet mixing of natural rubber of the present invention is provided with an inner retaining ring and an outer retaining ring, and the inner retaining ring with a conical hollow structure and the outer retaining ring with a conical hollow structure cooperate with each other to form a narrow flow chamber, and a narrow flow cavity is formed between the inner wall of the outer retaining ring and the outer wall of the inner retaining ring. The latex in a high-pressure state can flow into the narrow flow cavity from between the inner wall of the top of the outer retaining ring and the outer wall of the top of the inner retaining ring, and flow out of the narrow flow cavity in the form of a first water curtain of a conical hollow structure. The carbon black slurry in a high-pressure state flows into the carbon black slurry jet pipe from the top of the carbon black slurry jet pipe, and the second water curtain of a conical structure is sprayed from the spray part to the bottom of the inner retaining ring. The second water curtain collides with the first water curtain, and under the action of strong shear force, the emulsifier layer of the latex is destroyed and fully mixed with the carbon black slurry to form a composite masterbatch. Compared with the high-speed jet carbon black slurry and high-speed jet latex colliding and blending with each other at the output end of the three-way tube reactor to flocculate into a composite masterbatch or blending and flocculating after blending at the output end of the three-way tube reactor, the demulsification process no longer requires the assistance of a demulsifier. Under the premise of ensuring the production rhythm, the effective collision volume of the carbon black slurry and latex is effectively increased, the mixing effect of the carbon black slurry and latex is further improved, and the dispersion of carbon black is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a top view of some specific embodiments of a mixer for continuous production of natural rubber wet mixing according to the present invention;

[0042] Figure 2 yes Figure 1 A cross-sectional view of a mixer for continuous production of natural rubber wet mixing along AA shown;

[0043] Figure 3 yes Figure 2 The schematic diagram of the structure of some specific embodiments of the injection part of the mixer for continuous production of natural rubber wet mixing shown;

[0044] Figure 4 are schematic diagrams of some specific embodiments of the first water curtain and the second water curtain;

[0045] Figure 5It is a schematic structural diagram of some specific embodiments of a device for continuous production of natural rubber latex by wet mixing according to the present invention;

[0046] Figure 6 It is a schematic diagram of the working process of a mixing method for continuous production of natural rubber latex by wet mixing;

[0047] Figure 7 A photograph of one point of the first composite masterbatch obtained by microphotography;

[0048] Figure 8 A photograph of one point of the second composite masterbatch obtained by microphotography;

[0049] Fig. 9 is a photograph of one point of the third composite masterbatch obtained by microphotography;

[0050] Fig.10 is a photograph of one point of the fourth composite masterbatch obtained by microphotography;

[0051] Fig.11 This is a photo of one point of the fifth composite masterbatch taken by microphotography.

[0052] In the attached drawings, 100 is a mixer for continuous production of natural rubber wet mixing; 110 is a narrow flow chamber; 111 is an inner retaining ring; 112 is an outer retaining ring; 120 is a carbon black slurry jet pipe; 121 is an injection part; 130 is a coagulation chamber; 140 is a buffer chamber; 141 is an inner liner; 142 is an outer sleeve; 1421 is a liquid inlet; 143 is an upper connecting ring; 144 is a lower connecting ring; 210 is a carbon black slurry storage pressure tank; 220 is a carbon black slurry delivery pipe; 230 is a carbon black slurry booster pump; 310 is a latex storage pressure tank; 320 is a latex flow valve; 330 is a latex delivery pipe; 340 is a latex booster pump; 400 is a conveyor belt; 500 is a first water curtain; 600 is a second water curtain. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0054] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0055] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axis", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "join", "hinge", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4, a mixer 100 for continuous production of wet mixing of natural rubber, comprising a narrow flow chamber 110 and a carbon black slurry jet pipe 120. Specifically, the narrow flow chamber 110 comprises an inner retaining ring 111 and an outer retaining ring 112. Among them, the inner retaining ring 111 is a conical hollow structure, the axis is vertically arranged, and the top opening size is larger than the bottom opening size. The outer retaining ring 112 is a conical hollow structure, the axis is vertically arranged, and the top opening size is larger than the bottom opening size. The outer retaining ring 112 is arranged outside the inner retaining ring 111, and a narrow flow cavity is formed between the inner wall and the outer wall of the inner retaining ring 111. The latex in a high-pressure state can flow into the narrow flow cavity from between the inner wall at the top of the outer retaining ring 112 and the outer wall at the top of the inner retaining ring 111, and flow out of the narrow flow cavity in the form of a first water curtain 500 of a conical hollow structure. The axis of the carbon black slurry jet pipe 120 is vertically arranged, and a spray part 121 is provided at the bottom. The injection part 121 is arranged inside the inner retaining ring 111. The carbon black slurry in a high pressure state flows into the carbon black slurry jet pipe 120 from the top of the carbon black slurry jet pipe 120, and the second water curtain 600 of the conical structure is sprayed by the injection part 121 to the bottom of the inner retaining ring 111. It should be noted that, assuming that the first water curtain 500 is an inverted cone, the second water curtain 600 is a forward cone. The latex in a high pressure state means that the pressure of the latex is greater than 101Kpa, and the carbon black slurry in a high pressure state means that the pressure of the slurry is greater than 101Kpa.

[0059] In this embodiment, the inner retaining ring 111 of the conical hollow structure and the outer retaining ring 112 of the conical hollow structure cooperate with each other to form a narrow flow chamber 110, and a narrow flow cavity is formed between the inner wall of the outer retaining ring 112 and the outer wall of the inner retaining ring 111. The latex in a high-pressure state can flow into the narrow flow cavity from between the inner wall of the top of the outer retaining ring 112 and the outer wall of the top of the inner retaining ring 111, and flow out of the narrow flow cavity in the form of a first water curtain 500 of a conical hollow structure. The carbon black slurry in a high-pressure state flows into the carbon black slurry jet pipe 120 from the top of the carbon black slurry jet pipe 120, and the second water curtain 600 of the conical structure is sprayed directly below the inner retaining ring 111 by the spraying part 121. The second water curtain 600 and the first water curtain 500 collide with each other, and under the action of strong shear force, the emulsifier layer of the latex is destroyed and fully mixed with the carbon black slurry to form a composite masterbatch. Compared with the high-speed jet carbon black slurry and high-speed jet latex colliding and blending with each other at the output end of the three-way tube reactor to flocculate into a composite masterbatch or blending and flocculating after blending at the output end of the three-way tube reactor, the demulsification process no longer requires the assistance of a demulsifier. Under the premise of ensuring the production rhythm, the effective collision volume of the carbon black slurry and latex is effectively increased, the mixing effect of the carbon black slurry and latex is further improved, and the dispersion of carbon black is increased.

[0060] In some specific embodiments of the present invention, the injection portion 121 is a solid cone nozzle, a square nozzle, a rectangular nozzle, an elliptical nozzle, a fan-shaped nozzle, a straight-flow nozzle, a two-fluid nozzle or a multi-fluid nozzle, etc., so that the carbon black slurry can form a second water curtain 600 with a conical structure directly below the inner retaining ring 111, thereby increasing the effective collision volume of the carbon black slurry and latex.

[0061] In some specific embodiments of the present invention, the injection portion 121 is a spiral nozzle, which can spray a second water curtain 600 with a conical hollow structure directly below the inner retaining ring 111. Compared with the second water curtain 600 with a conical solid structure, the effective collision volume of the carbon black slurry and latex is further increased, so as to further improve the mixing effect of the carbon black slurry and latex, and further increase the dispersion of carbon black.

[0062] In some specific embodiments of the present invention, the angle between the side wall of the inner retaining ring 111 and the vertical direction is 30°-60°. The angle between the side wall of the outer retaining ring 112 and the vertical direction is also 30°-60°. In this way, the effective collision volume of the carbon black slurry and latex is further increased, so as to further improve the mixing effect of the carbon black slurry and latex, and further increase the dispersion of the carbon black.

[0063] In some specific embodiments of the present invention, the mixer 100 for continuous production of natural rubber wet mixing also includes a coagulation chamber 130. The coagulation chamber 130 is a hollow structure, the interior of which is a coagulation chamber, and the top end is fixedly connected to the bottom end of the outer retaining ring 112. The coagulation chamber is connected to the injection part 121 and the narrow flow cavity respectively. Here, it should be noted that the composite masterbatch formed by the collision between the second water curtain 600 and the first water curtain 500 is a composite masterbatch A. The composite masterbatch A will further mix and collide in the coagulation chamber 130 to generate a granular or flocculent composite masterbatch B, so as to further improve the mixing effect of the carbon black slurry and latex, and further improve the dispersion of carbon black. Among them, the mixing degree of the composite masterbatch B is higher than that of the composite masterbatch A.

[0064] In some specific embodiments of the present invention, the mixer 100 for continuous production of wet mixing of natural rubber also includes a buffer chamber 140. The buffer chamber 140 includes an inner liner 141 and an outer sleeve 142. Among them, the inner liner 141 is a cylindrical structure, and its axis is vertically arranged, and the bottom end is connected to the top of the inner retaining ring 111 and is in communication. The outer sleeve 142 is a cylindrical structure, and its axis is vertically arranged, and the cover is arranged on the outside of the inner liner 141, and the bottom end is connected to the top of the outer retaining ring 112 and is in communication. A buffer chamber is formed between the inner wall and the outer wall of the inner liner 141, and a liquid inlet 1421 is provided on one side. The buffer chamber is in communication with the narrow flow chamber. The latex in a high-pressure state flows through the liquid inlet 1421 and the buffer chamber in turn, and then flows into the narrow flow chamber. The buffer chamber 140 can temporarily store latex and play a role in stabilizing pressure, which is conducive to maintaining a uniform and stable state of the shape of the first water curtain and keeping the flow rate stable.

[0065] In some specific embodiments of the present invention, an upper connecting ring 143 is provided at the top of the buffer chamber 140, and a lower connecting ring 144 is provided at the bottom. The inner side of the upper connecting ring 143 is fixedly connected to the top of the inner liner 141, and the outer side is fixedly connected to the top of the outer sleeve 142. The inner side of the lower connecting ring 144 is fixedly connected to the top of the outer retaining ring 112, and the outer side is fixedly connected to the bottom of the outer sleeve 142. The inner liner 141, the outer sleeve 142, the upper connecting ring 143 and the lower connecting ring cooperate to form a relatively closed buffer chamber space to ensure that the buffer chamber 140 can withstand high pressure.

[0066] Taking the mass percentage concentration of carbon black slurry as 3%, the flow rate of carbon black slurry as 20L / min, the mass percentage concentration of latex as 20%, and the flow rate of latex as 6L / min as an example, different mixers are used to mix carbon black slurry and latex to generate a variety of composite masterbatches. A carbon black dispersometer manufactured by Alpha Technology, Inc. of the United States, was used to measure the dispersion of carbon black in each composite masterbatch by microphotography. The detection process is as follows: First, use a blade to cut the composite masterbatch to form a flat cross-section. Then use dark field lighting to irradiate the cross-section at an inclination angle of 30°. The carbon black aggregates appear bright, and the rubber appears dark black (such as Figure 7-Figure 11 After that, the imaging device transmits the picture to the computer. The computer automatically selects five points, compares each point with the Philips 10-level standard, automatically determines the carbon black dispersion value and dispersion rate of each point, and finally calculates the average dispersion value and average dispersion rate of the carbon black at the five points.

[0067] Example 1

[0068] The mixer 100 for continuous production of wet mixing of natural rubber includes a narrow flow chamber 110, a carbon black slurry jet pipe 120, a coagulation chamber 130 and a buffer chamber 140. The narrow flow chamber 110 includes an inner retaining ring 111 and an outer retaining ring 112. The inner retaining ring 111 is a conical hollow structure, the axis is vertically arranged, and the top opening size is larger than the bottom opening size. The outer retaining ring 112 is a conical hollow structure, the axis is vertically arranged, the top opening size is larger than the bottom opening size, and the ring is arranged outside the inner retaining ring 111, and a narrow flow cavity is formed between the inner wall and the outer wall of the inner retaining ring 111. The axis of the carbon black slurry jet pipe 120 is vertically arranged, and a spiral nozzle is provided at the bottom end. The coagulation chamber 130 is hollow, and the interior is a coagulation cavity, and the top end is fixedly connected to the bottom end of the outer retaining ring 112. The coagulation cavity is connected to the injection part 121 and the narrow flow cavity respectively. The inner liner 141 of the buffer chamber 140 is hollow, with an axis vertically arranged, and the bottom end is connected to and communicated with the top end of the inner retaining ring 111 of the narrow flow chamber 110. The outer sleeve 142 of the buffer chamber 140 is hollow, with an axis vertically arranged, and is covered on the outside of the inner liner 141. The bottom end is connected to and communicated with the top end of the outer retaining ring 112 of the narrow flow chamber 110. A buffer cavity is formed between the inner wall and the outer wall of the inner liner 141, and a liquid inlet 1421 is provided on one side. The buffer cavity is connected with the narrow flow cavity. Among them, the angle between the side wall of the inner retaining ring 111 and the vertical direction is 30°, and the angle between the side wall of the outer retaining ring 112 and the vertical direction is also 30°.

[0069] The composite masterbatch produced by the mixer is named as the first composite masterbatch. The dispersion value and dispersion rate of carbon black in the first composite masterbatch are detected by microphotography. The measurement results are shown in Table 1 below:

[0070] Spot X Y Z White area[%] Dispersion[%] 1 8.13 9.79 89.06 3.83 98.49 2 8.56 9.91 90.76 3.23 99.37 3 8.46 9.95 89.59 3.64 99.64 4 8.52 9.97 90.42 3.35 99.81 5 8.69 9.96 91.65 2.92 99.74 Overall 8.47 9.92 90.29 3.40 99.41

[0071] Table 1

[0072] In Table 1, the average value of the dispersion value X is 8.47 (e.g. Figure 7 As shown), the average dispersion rate Dispersion is 99.41%.

[0073] Example 2

[0074] The mixer 100 for continuous production of wet mixing of natural rubber includes a narrow flow chamber 110, a carbon black slurry jet pipe 120, a coagulation chamber 130 and a buffer chamber 140. The narrow flow chamber 110 includes an inner retaining ring 111 and an outer retaining ring 112. The inner retaining ring 111 is a conical hollow structure, the axis is vertically arranged, and the top opening size is larger than the bottom opening size. The outer retaining ring 112 is a conical hollow structure, the axis is vertically arranged, the top opening size is larger than the bottom opening size, and the ring is arranged outside the inner retaining ring 111, and a narrow flow cavity is formed between the inner wall and the outer wall of the inner retaining ring 111. The axis of the carbon black slurry jet pipe 120 is vertically arranged, and a spiral nozzle is provided at the bottom end. The coagulation chamber 130 is hollow, and the interior is a coagulation cavity, and the top end is fixedly connected to the bottom end of the outer retaining ring 112. The coagulation cavity is connected to the injection part 121 and the narrow flow cavity respectively. The inner liner 141 of the buffer chamber 140 is hollow, with an axis vertically arranged, and the bottom end is connected to and communicated with the top end of the inner retaining ring 111 of the narrow flow chamber 110. The outer sleeve 142 of the buffer chamber 140 is hollow, with an axis vertically arranged, and is covered on the outside of the inner liner 141. The bottom end is connected to and communicated with the top end of the outer retaining ring 112 of the narrow flow chamber 110. A buffer cavity is formed between the inner wall and the outer wall of the inner liner 141, and a liquid inlet 1421 is provided on one side. The buffer cavity is connected with the narrow flow cavity. Among them, the angle between the side wall of the inner retaining ring 111 and the vertical direction is 45°, and the angle between the side wall of the outer retaining ring 112 and the vertical direction is also 45°.

[0075] The composite masterbatch produced by the mixer is named as the second composite masterbatch. The dispersion value and dispersion rate of carbon black in the second composite masterbatch are detected by microphotography. The test results are shown in Table 2 below:

[0076] Spot X Y Z White area[%] Dispersion[%] 1 8.78 9.94 92.10 2.77 99.59 2 8.16 9.83 91.01 3.15 98.81 3 8.76 9.95 93.56 2.25 99.64 4 8.78 9.95 94.65 1.87 99.67 5 8.54 9.90 91.41 3.01 99.31 Overall 8.61 9.92 92.55 2.61 99.40

[0077] Table 2

[0078] In Table 2, the average value of the dispersion value X is 8.61 (e.g. Figure 8 As shown), the average dispersion rate Dispersion is 99.40%.

[0079] Example 3

[0080] The mixer 100 for continuous production of wet mixing of natural rubber includes a narrow flow chamber 110, a carbon black slurry jet pipe 120, a coagulation chamber 130 and a buffer chamber 140. The narrow flow chamber 110 includes an inner retaining ring 111 and an outer retaining ring 112. The inner retaining ring 111 is a conical hollow structure, the axis is vertically arranged, and the top opening size is larger than the bottom opening size. The outer retaining ring 112 is a conical hollow structure, the axis is vertically arranged, the top opening size is larger than the bottom opening size, and the ring is arranged outside the inner retaining ring 111, and a narrow flow cavity is formed between the inner wall and the outer wall of the inner retaining ring 111. The axis of the carbon black slurry jet pipe 120 is vertically arranged, and a spiral nozzle is provided at the bottom end. The coagulation chamber 130 is hollow, and the interior is a coagulation cavity, and the top end is fixedly connected to the bottom end of the outer retaining ring 112. The coagulation cavity is connected to the injection part 121 and the narrow flow cavity respectively. The inner liner 141 of the buffer chamber 140 is hollow, with an axis vertically arranged, and the bottom end is connected to and communicated with the top end of the inner retaining ring 111 of the narrow flow chamber 110. The outer sleeve 142 of the buffer chamber 140 is hollow, with an axis vertically arranged, and is covered on the outside of the inner liner 141. The bottom end is connected to and communicated with the top end of the outer retaining ring 112 of the narrow flow chamber 110. A buffer cavity is formed between the inner wall and the outer wall of the inner liner 141, and a liquid inlet 1421 is provided on one side. The buffer cavity is connected with the narrow flow cavity. Among them, the angle between the side wall of the inner retaining ring 111 and the vertical direction is 60°, and the angle between the side wall of the outer retaining ring 112 and the vertical direction is also 60°.

[0081] The composite masterbatch produced by the mixer is named as the third composite masterbatch. The dispersion value and dispersion rate of carbon black in the third composite masterbatch are detected by microphotography. The test results are shown in Table 3 below:

[0082]

[0083]

[0084] Table 3

[0085] In Table 3, the average value of the dispersion value X is 8.18 (e.g. Fig. 9 As shown), the average dispersion rate Dispersion is 99.19%.

[0086] Comparative Example 1

[0087] A three-way pipe reactor is used as a mixer, so that high-speed jets of carbon black slurry and high-speed jets of latex collide with each other at the output end of the three-way pipe reactor to blend and flocculate into a composite masterbatch.

[0088] The composite masterbatch produced by the mixer is named the fourth composite masterbatch. The dispersion value and dispersion rate of carbon black in the fourth composite masterbatch are detected by microphotography. The measurement results are shown in Table 4 below:

[0089] Spot X Y Z White area[%] Dispersion[%] 1 7.12 8.04 90.33 1.45 97.11 2 7.35 8.82 90.34 1.68 97.24 3 6.96 8.35 90.66 3.12 97.03 4 7.42 8.90 90.42 1.19 97.56 5 7.21 8.65 90.38 2.14 97.62 Overall 7.21 8.55 90.43 1.92 97.31

[0090] Table 4

[0091] In Table 4, the average value of the dispersion value X is 7.21 (e.g. Fig.10 As shown), the average dispersion rate Dispersion is 97.31%.

[0092] Comparative Example 2

[0093] A spiral structure is added at the output end of the three-way pipe reactor to form a mixer.

[0094] The composite masterbatch produced by the mixer is named the fifth composite masterbatch. The dispersion value and dispersion rate of carbon black in the fifth composite masterbatch are detected by microphotography. The test results are shown in Table 5 below:

[0095] Spot X Y Z White area[%] Dispersion[%] 1 7.51 9.34 93.17 1.96 98.69 2 7.47 9.41 92.08 1.37 98.58 3 5.32 9.35 91.84 3.26 98.23 4 8.79 8.76 94.07 1.91 98.47 5 8.12 8.93 93.83 2.41 98.81 Overall 7.44 9.16 93.00 2.18 98.56

[0096] Table 5

[0097] In Table 5, the average value of the dispersion value X is 7.44 (e.g. Fig.11 As shown), the average value of the dispersion rate Dispersion is 98.56%.

[0098] From the average values ​​of the carbon black dispersion values ​​X measured in Examples 1-3 and Comparative Examples 1-2, it can be seen that the narrow flow chamber 110 cooperates with the carbon black slurry jet pipe 120 to further improve the mixing effect of the carbon black slurry and latex, and improve the dispersion level of the carbon black.

[0099] Reference Figure 2 and Figure 5 The present invention also provides a device for continuous production of natural rubber latex wet mixing, comprising a carbon black slurry storage pressure tank 210, a carbon black slurry flow valve (not shown in the figure), a carbon black slurry delivery pipe 220, a carbon black slurry booster pump 230, a latex storage pressure tank 310, a latex flow valve 320, a latex delivery pipe 330, a latex booster pump 340, and a mixer provided by any of the above-mentioned specific embodiments. Among them, the carbon black slurry storage pressure tank 210, the carbon black slurry flow valve, the carbon black slurry delivery pipe 220, the carbon black slurry delivery pipe 230 and the top of the carbon black slurry jet pipe 120 are connected in sequence. The carbon black slurry storage pressure tank 210 can temporarily store carbon black slurry, and the carbon black slurry flow valve can control the flow of carbon black slurry. The carbon black slurry delivery pipe 230 can provide power for the flow of carbon black slurry and boost the carbon black slurry. The mixer includes a buffer chamber 140. The latex storage pressure tank 310, the latex flow valve 320, the latex delivery pipe 330, the latex booster pump 340 and the buffer chamber 140 are sequentially connected. The latex storage pressure tank 310 can temporarily store latex, and the latex flow valve 320 can control the flow of latex. The latex booster pump 340 can provide power for the flow of latex and increase the pressure of latex.

[0100] In this embodiment, after the latex in the latex storage pressure tank 310 flows through the latex flow valve 320, the latex delivery pipe 330, the latex booster pump 340, the buffer chamber 140 and the narrow flow chamber 110 in sequence, a first water curtain 500 with a conical hollow structure is formed directly below the inner retaining ring 111. After the carbon black slurry in the carbon black slurry storage pressure tank 210 flows through the carbon black slurry flow valve, the carbon black slurry delivery pipe 220, the carbon black slurry delivery pipe 230 and the carbon black slurry jet pipe 120 in sequence, a second water curtain 600 with a conical structure is sprayed from the spraying part 121 to the bottom of the inner retaining ring 111. The second water curtain 600 and the first water curtain 500 collide with each other, and under the action of strong shear force, the emulsifier layer of the latex is destroyed and fully mixed with the carbon black slurry to form a composite masterbatch. Under the premise of ensuring the production rhythm, the effective collision volume of carbon black slurry and latex is effectively increased, the mixing effect of carbon black slurry and latex is further improved, and the dispersion of carbon black is increased.

[0101] In some specific embodiments of the present invention, the device for continuous production of wet mixing of natural rubber latex further includes a dryer (not shown in the figure) and a conveyor belt 400. The dryer is arranged below the mixer for continuous production of wet mixing of natural rubber and is connected to the coagulation chamber 130. The granular or flocculent composite masterbatch discharged from the coagulation chamber 130 flows into the dryer for dehydration and drying. The conveyor belt 400 is arranged below the dryer. The dried composite masterbatch discharged from the dryer falls onto the conveyor belt 400 and is transported to the packaging place by the conveyor belt 400.

[0102] Reference Figure 6 The present invention also provides a mixing method for continuous production of natural rubber latex by wet mixing, comprising the following steps:

[0103] S100 , using the buffer chamber 140 to store latex.

[0104] In this step, before the latex from the latex storage pressure tank 310 flows into the narrow flow chamber 110, it will be temporarily stored in the buffer chamber 140. It should be noted that the latex stored in the latex storage pressure tank 310 and the buffer chamber 140 is the latex used for continuous production. Natural latex refers to a suspension of rubber micelle particles in water. Natural latex is used as a raw material for continuous production, and appropriate water is added to the natural latex to form the latex used for continuous production. The buffer chamber 140 is conducive to the flow state of the latex to maintain a stable state, thereby ensuring the stability of the shape of the first water curtain 500 formed.

[0105] S200 , the narrow flow chamber 110 allows the latex in a high pressure state to flow out in the form of a first water curtain 500 having a conical hollow structure.

[0106] In this step, the latex is pressurized by the latex booster pump to make the latex in a high-pressure state. The narrow flow chamber 110 forces the high-pressure latex to flow out in the form of a first water curtain 500 with a conical hollow structure.

[0107] S300, the carbon black slurry jet pipe 120 causes the high-pressure carbon black slurry to flow out in the first water curtain 500 in the form of a second water curtain 600 with a conical structure, and collide with the first water curtain 500 to demulsify the latex. The demulsified latex is mixed with the carbon black slurry to form a composite masterbatch A.

[0108] In this step, the second water curtain 600 collides with the first water curtain 500 to break the latex and mix and coagulate the latex with the carbon black slurry. It should be noted that the carbon black slurry is formed by dissolving white carbon black or black carbon black in water.

[0109] At S400, the composite masterbatch A collides in the coagulation chamber to form a composite masterbatch B.

[0110] In this step, the composite masterbatch A will further mix and collide in the coagulation chamber 130 to generate a granular or flocculent composite masterbatch B, so as to further improve the mixing effect of the carbon black slurry and latex, and further increase the dispersion of carbon black. Since the space in the coagulation chamber is limited, the activity space of the composite masterbatch A can be limited, so that the latex and carbon black slurry mixed in the composite masterbatch A collide more violently, thereby completely coagulating. Among them, the mixing degree of the composite masterbatch B is higher than that of the composite masterbatch A, and the dispersion of carbon black is higher than that of the carbon black in the composite masterbatch A.

[0111] In some specific embodiments of the present invention, the mass percentage concentration of the latex forming the first water curtain 500 is 5%-60%. The pressure required to form the first water curtain 500 is 0.1Mpa-10Mpa. The mass percentage concentration of the carbon black slurry forming the second water curtain 600 is 3%-5%, and the required pressure is above 1Mpa.

[0112] Example 4

[0113] The mass percentage concentration of the latex forming the first water curtain 500 is 60%, and the latex flow rate is 2L / min. The carbon black model used is N234 or N339, the mass percentage concentration of the carbon black slurry forming the second water curtain 600 is 4%, and the flow rate of the carbon black slurry is 15L / min. The purpose of adding 50 parts of carbon black to 100 parts of latex is achieved, so that the content of carbon black is 33.33%. The average value of the carbon black dispersion value X in the composite masterbatch measured by microphotography is 8.19.

[0114] Example 5

[0115] The mass percentage concentration of the latex forming the first water curtain 500 is 5%, and the latex flow rate is 24L / min. The carbon black model used is N234 or N339, and the mass percentage concentration of the carbon black slurry forming the second water curtain 600 is 4%, and the flow rate of the carbon black slurry is 15L / min. The purpose of adding 50 parts of carbon black to 100 parts of latex is achieved, so that the content of carbon black is 33.33%. The average value of the carbon black dispersion value X in the composite masterbatch measured by microphotography is 8.03.

[0116] Example 6

[0117] The mass percentage concentration of the latex forming the first water curtain 500 is 20%, and the latex flow rate is 6L / min. The carbon black model used is N234 or N339, the mass percentage concentration of the carbon black slurry forming the second water curtain 600 is 4%, and the flow rate of the carbon black slurry is 15L / min. The purpose of adding 50 parts of carbon black to 100 parts of latex is achieved, so that the content of carbon black is 33.33%. The average value of the carbon black dispersion value X in the composite masterbatch measured by microphotography is 8.36.

[0118] Example 7

[0119] The mass percentage concentration of the latex forming the first water curtain 500 is 30%, and the latex flow rate is 4L / min. The carbon black model used is N234 or N339, and the mass percentage concentration of the carbon black slurry forming the second water curtain 600 is 4%, and the flow rate of the carbon black slurry is 15L / min. The purpose of adding 50 parts of carbon black to 100 parts of latex is achieved, so that the content of carbon black is 33.33%. The average value of the carbon black dispersion value X in the composite masterbatch measured by microphotography is 8.58.

[0120] Example 8

[0121] The mass percentage concentration of the latex forming the first water curtain 500 is 30%, and the latex flow rate is 4L / min. The carbon black model used is N234 or N339, the mass percentage concentration of the carbon black slurry forming the second water curtain 600 is 1%, and the flow rate of the carbon black slurry is 60L / min. The purpose of adding 50 parts of carbon black to 100 parts of latex is achieved, so that the content of carbon black is 33.33%. The average value of the carbon black dispersion value X in the composite masterbatch measured by microphotography is 8.47.

[0122] Example 9

[0123] The mass percentage concentration of the latex forming the first water curtain 500 is 20%, and the latex flow rate is 6L / min. The pressure required to form the first water curtain 500 is 5Mpa. The carbon black model used is N234 or N339, the mass percentage concentration of the carbon black slurry forming the second water curtain 600 is 3%, the flow rate of the carbon black slurry is 20L / min, and the pressure required to form the second water curtain 600 is 5Mpa. The purpose of adding 50 parts of carbon black to 100 parts of latex is achieved, so that the content of carbon black is 33.33%. The average value of the carbon black dispersion value X in the composite masterbatch measured by microphotography is 8.61.

[0124] Example 10

[0125] The mass percentage concentration of the latex forming the first water curtain 500 is 20%, and the latex flow rate is 6L / min. The carbon black model used is N234 or N339, the mass percentage concentration of the carbon black slurry forming the second water curtain 600 is 5%, and the flow rate of the carbon black slurry is 12L / min. The purpose of adding 50 parts of carbon black to 100 parts of latex is achieved, so that the content of carbon black is 33.33%. The average value of the carbon black dispersion value X in the composite masterbatch measured by microphotography is 8.59.

[0126] Embodiment 11

[0127] The mass percentage concentration of the latex forming the first water curtain 500 is 30%, and the latex flow rate is 4L / min. The carbon black model used is N234 or N339, the mass percentage concentration of the carbon black slurry forming the second water curtain 600 is 10%, and the flow rate of the carbon black slurry is 6L / min. The purpose of adding 50 parts of carbon black to 100 parts of latex is achieved, so that the content of carbon black is 33.33%. The average value of the carbon black dispersion value X in the composite masterbatch measured by microphotography is 8.42.

[0128] It can be seen from Examples 4-11 that when the mass percentage concentration of the latex forming the first water curtain 500 is 20%, the latex flow rate is 6 L / min, the pressure required to form the first water curtain 500 is 5 MPa, and the mass percentage concentration of the carbon black slurry forming the second water curtain 600 is 3%, the flow rate of the carbon black slurry is 20 L / min, and the pressure required to form the second water curtain 600 is 5 MPa, the dispersion of carbon black is optimal.

[0129] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", "one specific embodiment" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0130] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and the inventive concepts of the present invention within the scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mixer for continuous production of natural rubber wet mixing, characterized in that: include: Narrow flow chamber, carbon black slurry jet pipe and buffer chamber; The narrow flow chamber comprises an inner retaining ring and an outer retaining ring; The inner retaining ring is a conical hollow structure, the axis is vertically arranged, and the top opening size is larger than the bottom opening size; The outer retaining ring is a conical hollow structure, the axis is vertically arranged, the top opening size is larger than the bottom opening size, and the ring is arranged outside the inner retaining ring, and a narrow flow cavity is formed between the inner wall and the outer wall of the inner retaining ring; the latex in a high-pressure state can flow into the narrow flow cavity from between the inner wall of the top end of the outer retaining ring and the outer wall of the top end of the inner retaining ring, and flow out of the narrow flow cavity in the form of a first water curtain of the conical hollow structure; The axis of the carbon black slurry jet pipe is vertically arranged, and a jet part is arranged at the bottom; the jet part is arranged inside the inner retaining ring; the carbon black slurry in a high pressure state flows into the carbon black slurry jet pipe from the top of the carbon black slurry jet pipe; The spraying part is a spiral nozzle, which can spray a second water curtain with a conical hollow structure directly below the inner retaining ring; The buffer chamber comprises an inner liner and an outer sleeve; The inner liner is hollow, the axis is vertically arranged, and the bottom end is connected and communicated with the top end of the inner retaining ring; The outer sleeve is hollow, the axis is vertically arranged, the cover is arranged outside the inner sleeve, the bottom end is connected and communicated with the top end of the outer retaining ring, a buffer cavity is formed between the inner wall and the outer wall of the inner sleeve, and a liquid inlet is arranged on one side; The buffer cavity is communicated with the narrow flow cavity; the latex in a high-pressure state flows through the liquid inlet and the buffer cavity in sequence, and then flows into the narrow flow cavity.

2. The mixer for continuous production of natural rubber wet mixing according to claim 1, wherein: The angle between the side wall of the inner retaining ring and the vertical direction is 30°-60°; The included angle between the side wall of the outer retaining ring and the vertical direction is also 30°-60°.

3. The mixer for continuous production of natural rubber wet mixing according to claim 1 or 2, wherein: Also included is a condensation chamber; The condensation chamber is hollow, the interior is a condensation cavity, and the top end is fixedly connected to the bottom end of the outer retaining ring; The condensation chamber is communicated with the injection portion and the narrow flow chamber respectively.

4. The mixer for continuous production of natural rubber wet mixing according to claim 1, wherein: The top end of the buffer chamber is provided with an upper connecting ring, and the bottom end is provided with a lower connecting ring; The inner side of the upper connecting ring is fixedly connected to the top end of the inner liner, and the outer side is fixedly connected to the top end of the outer sleeve; The inner side of the lower connecting ring is fixedly connected to the top end of the outer retaining ring, and the outer side is fixedly connected to the bottom end of the outer sleeve.

5. A device for continuous production of natural rubber latex by wet mixing, characterized in that: It comprises a carbon black slurry storage pressure tank, a carbon black slurry flow valve, a carbon black slurry delivery pipe, a carbon black slurry booster pump, a latex storage pressure tank, a latex flow valve, a latex delivery pipe, a latex booster pump and the mixer according to any one of claims 1 to 4; The carbon black slurry storage pressure tank, the carbon black slurry flow valve, the carbon black slurry delivery pipe, the carbon black slurry booster pump and the top end of the carbon black slurry jet pipe are connected in sequence; The mixer includes a buffer chamber; The latex storage pressure tank, the latex flow valve, the latex delivery pipe, the latex booster pump and the buffer chamber are connected in sequence.

6. A mixing method for continuous production of natural rubber latex by wet mixing, characterized in that: The method is implemented by using the mixer for continuous production of natural rubber wet mixing according to any one of claims 1 to 4, comprising the following steps: The narrow flow chamber allows the latex in a high pressure state to flow out in the form of a first water curtain with a conical hollow structure; The carbon black slurry jet pipe causes the carbon black slurry in a high pressure state to flow out in the first water curtain in the form of a second water curtain with a conical structure, and to counteract the first water curtain to demulsify the latex; the demulsified latex is mixed with the carbon black slurry to form a composite masterbatch A; Before the narrow flow chamber allows the latex in a high pressure state to flow out in the form of a first water curtain of a conical hollow structure, a buffer chamber is used to store the latex; After the demulsified latex and the carbon black slurry form the composite masterbatch A, the composite masterbatch A collides in a coagulation chamber to form a composite masterbatch B.

7. The mixing method for continuous production of natural rubber latex by wet mixing according to claim 6, wherein: The mass percentage concentration of the latex forming the first water curtain is 5%-60%, and the required pressure is 0.1Mpa-10Mpa; The mass percentage concentration of the carbon black slurry forming the second water curtain is 1%-10%, and the required pressure is above 1Mpa.

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