Reaction kettle for grafting chloroprene rubber

Abstract

The reaction kettle comprises a reaction kettle body with a jacket, an electric heating tube is arranged at the bottom of the reaction kettle body, a jacket water inlet and a jacket water outlet are formed in the jacket, a heat preservation layer is arranged on the outer portion of the reaction kettle body, a stirring motor is arranged at the top of the reaction kettle body, and the jacket water inlet and the jacket water outlet are formed in the bottom of the reaction kettle body. The stirring motor is connected with a stirring shaft, a sealing box is arranged between the stirring motor and the stirring shaft, an air inlet is formed in the top of the sealing box, a circle of air inlets are formed in the part, located in the sealing box, of the stirring shaft, a plurality of stirring paddles are arranged on the stirring shaft, and turbulent flow baffles are arranged on the stirring paddles connected to the bottom of the stirring shaft. The stirring shaft, the stirring paddle and the turbulent flow baffle are hollow and internally communicated with one another, and air outlet holes are formed in the stirring paddle and the turbulent flow baffle. Materials in the reaction kettle can be fully and uniformly mixed, so that full grafting reaction of chloroprene rubber and methyl methacrylate is facilitated, and the grafting rate of the chloroprene rubber is improved.

Description

Technical Field

[0001] The utility model relates to the field of polymer reaction equipment, in particular to a reaction kettle used for chloroprene rubber grafting. Background Art

[0002] Grafted chloroprene rubber adhesive is a multi-purpose adhesive made by dissolving chloroprene rubber in an organic solvent, using methyl methacrylate as a grafting monomer and peroxide as an initiator to carry out a grafting reaction under nitrogen protection and at a certain temperature, and then dissolving a tackifying resin after the reaction is completed. Grafted chloroprene rubber adhesive has good initial adhesion, good bonding strength and heat resistance, and a long adhesion retention time. As the second-generation adhesive for shoes and bags, it has been widely used for many years.

[0003] The grafting reaction of chloroprene rubber is generally carried out under a nitrogen atmosphere and at a low stirring rate. The reaction viscosity is relatively high, usually in the range of several hundred to several thousand cps. Traditional grafting reactors are equipped with mechanical stirring, and the nitrogen pipe generally does not extend into the reaction materials. The nitrogen concentration on the surface of the reaction materials and in the upper space of the reactor is high, while the concentration inside the system is relatively low. Therefore, the protective effect of nitrogen is limited. In addition, because the grafting reaction speed cannot be too fast, when the viscosity of the system is high, the linear velocity of the material at the center of the stirring shaft is almost zero, and good turbulence cannot be formed. The materials cannot be fully mixed, which is not conducive to improving the grafting rate. The bubbling reactor can improve this situation to a certain extent. The utility model patent with application number CN200920234298.7 discloses a bubbling reactor, in which a perforated air pipe is set on the inner wall of the reactor body, and nitrogen is bubbled through the air pipe. The disadvantage of this method is that the small holes on the air pipe are evenly distributed, so the pressure of nitrogen gradually decreases after passing through the air pipe with small holes in the front section. When it reaches the air pipe at the bottom of the reactor, the pressure in the air pipe is the smallest, and the flow rate is also the smallest, and the bubbling effect will be greatly reduced; if the intake pressure is increased, the nitrogen and energy consumed will be greatly increased. The utility model patent with application number CN201420694461.9 designs an L-shaped bubbling device in the reactor, which eliminates mechanical stirring and reduces power consumption. However, for a reaction system with high viscosity, bubbling alone cannot fully mix the reaction materials.

[0004] Therefore, a reaction kettle equipped with mechanical stirring and economical and effective bubbling is needed to solve the above-mentioned problems in the chloroprene rubber grafting reaction process. Utility Model Content

[0005] The utility model aims to provide a reaction kettle for chloroprene rubber grafting. The materials in the reaction kettle can be fully mixed and uniform, which is beneficial to the full grafting reaction of chloroprene rubber and methyl methacrylate and improves the grafting rate of chloroprene rubber.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a reactor for grafting chloroprene rubber, comprising a reactor with a jacket, an electric heating pipe is arranged at the bottom of the reactor, a jacket water inlet and a jacket water outlet are arranged on the jacket, an insulation layer is arranged on the outside of the reactor, a stirring motor is arranged at the top of the reactor, the stirring motor is connected to a stirring shaft, a sealing box is arranged between the stirring motor and the stirring shaft, a sealing box air inlet is arranged at the top of the sealing box, a circle of air inlets is arranged on the part of the stirring shaft located in the sealing box, a plurality of stirring paddles are arranged on the stirring shaft, a spoiler baffle is arranged on the stirring paddle connected to the bottom of the stirring shaft, the stirring shaft, the stirring paddle and the spoiler baffle are all hollow and interconnected internally, and air outlets are arranged on the stirring paddle and the spoiler baffle.

[0007] Furthermore, the stirring shaft is respectively connected with an upper stirring paddle, a middle stirring paddle and a bottom stirring paddle from top to bottom; and two air outlet holes are respectively provided at the connection between the stirring shaft and the upper stirring paddle, the middle stirring paddle and the bottom stirring paddle.

[0008] Furthermore, the two ends of the middle stirring paddle are respectively provided with one air outlet hole, and the two ends of the bottom stirring paddle are respectively provided with two air outlet holes.

[0009] Furthermore, the bottom stirring paddle is evenly provided with three spoiler baffles near the bottom of the kettle, the angle between any two of the three spoiler baffles is 120°, and the ends of the three spoiler baffles are all provided with air outlets.

[0010] Furthermore, the inner wall of the reactor is evenly provided with three layers of baffles from top to bottom.

[0011] Furthermore, a solid material feed inlet, a liquid material feed inlet and an exhaust port are provided above the reactor.

[0012] Furthermore, a finished product packaging warehouse is provided at the bottom of the reactor.

[0013] Furthermore, a finished product packaging storage port is provided at the bottom of the reactor.

[0014] Furthermore, two groups of electric heating tubes are provided at the bottom of the reactor.

[0015] The new technical solution of this invention has the following beneficial effects:

[0016] 1. The stirring shaft, stirring paddle and bottom spoiler baffle are all set to be hollow. Small holes are set at the connection between the stirring shaft and the upper, middle and bottom stirring paddles, and at the ends of the middle and bottom stirring paddles, so that nitrogen can be introduced into the system. Due to its low density, the gas rises to the liquid level of the reactor and is discharged from the top of the reactor, which can effectively increase the turbulence of the material near the center of the stirring shaft.

[0017] 2. A spoiler baffle is set at the bottom of the bottom stirring paddle, and a small hole is set at the bottom of the baffle, so that the material at the bottom forms turbulence and the mixing is more uniform.

[0018] 3. The total number of pores is small and more are distributed at the lower end and fewer at the upper end, which can avoid excessive pressure loss of nitrogen flowing through the stirring shaft and stirring paddle. In addition, nitrogen is used as a protective gas and also as a bubbling turbulent gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the reaction kettle of the utility model. DETAILED DESCRIPTION

[0020] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and 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 utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1The utility model reactor 1 is provided with a jacket 2 and two groups of electric heating tubes 3. A jacket water inlet 4 is provided at the bottom of the reactor 1, a jacket water outlet 5 is provided at the upper end, and a heat preservation layer 6 is provided on the outer side of the reactor 1.

[0024] Specifically, a stirring motor 7 is installed on the top of the reactor 1, and the stirring motor 7 is connected to the stirring shaft 10. A sealing box 8 is provided between the stirring motor 7 and the stirring shaft 10. A sealing box air inlet 9 is provided on the top of the sealing box 8, and a circle of air inlets 11 is provided on the part of the stirring shaft 10 located in the sealing box 8.

[0025] The stirring shaft 10 is respectively connected with an upper stirring paddle 12, a middle stirring paddle 13 and a bottom stirring paddle 14 from top to bottom, and two air outlets 15 are provided at the connection between the stirring shaft 10 and the upper stirring paddle 12. Two air outlets are provided at the connection between the stirring shaft 10 and the middle stirring paddle 13, and one air outlet 15 is provided at each end of the middle stirring paddle 13. Two air outlets 15 are provided at the connection between the stirring shaft 10 and the bottom stirring paddle 14, and two air outlets 15 are provided at each end of the bottom stirring paddle 14.

[0026] The bottom stirring paddle 14 is evenly provided with three spoiler baffles 16 near the bottom of the kettle, and the angle between any two of the three spoiler baffles is 120°.

[0027] Specifically, the stirring shaft 10, the upper stirring paddle 12, the middle stirring paddle 13, the bottom stirring paddle 14 and the bottom spoiler baffle are all hollow and interconnected internally.

[0028] Specifically, the reactor wall of the reactor 1 is provided with three layers of baffles 17 , and each layer is evenly provided with three baffles.

[0029] A solid material feed inlet 18 , a liquid material feed inlet 19 and an exhaust port 20 are provided above the reactor 1 .

[0030] A finished product packaging opening 21 is provided at the bottom of the reaction kettle 1 .

[0031] The working process of the reactor of the utility model is as follows:

[0032] 1. Turn on the electric heating tube 3 and set the preset water temperature;

[0033] 2. The solvent is pumped in through the liquid material feed port 19, the stirring motor 7 is turned on and set to a suitable high speed, the stirring shaft and the stirring paddle are driven to rotate, and the chloroprene rubber is put in from the solid material feed port 18. When the chloroprene rubber is completely dissolved and the temperature in the reactor rises to a predetermined temperature, methyl methacrylate is pumped in through the liquid material feed port 19. After stirring evenly, the nitrogen switch is turned on, and the nitrogen is discharged through the sealing box air inlet 9, the air inlet 11, the hollow stirring shaft, the stirring paddle and the air outlet of the bottom spoiler baffle, and finally rises to the liquid surface and the upper end of the reactor, and finally discharged from the exhaust port 20.

[0034] 3. Add peroxide initiator from the solid material feed port 18, stir evenly, set a suitable low speed, and start the grafting reaction.

[0035] 4. After the grafting reaction is completed, an antioxidant is added from the solid material feed port 18, and at the same time, the electric heating is turned off, set to a suitable high speed, and the cooling water is turned on. The cooling water passes through the jacket water inlet 4, squeezes out the hot water in the jacket 2, and is discharged through the jacket water outlet 5.

[0036] 5. After the tackifying resin is completely dissolved, add an appropriate amount of solvent to adjust the viscosity of the product and package it through the finished product packaging port 21.

[0037] In summary, the materials in the reactor of the utility model can be fully mixed and uniform, which is beneficial to the full grafting reaction of chloroprene rubber and methyl methacrylate and improves the grafting rate of chloroprene rubber.

[0038] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A reactor for grafting chloroprene rubber, comprising a reactor with a jacket, wherein an electric heating pipe is provided at the bottom of the reactor, a jacket water inlet and a jacket water outlet are provided on the jacket, and an insulation layer is provided on the outside of the reactor, characterized in that: A stirring motor is provided on the top of the reactor, the stirring motor is connected to a stirring shaft, a sealing box is provided between the stirring motor and the stirring shaft, a sealing box air inlet is provided on the top of the sealing box, a circle of air inlets is provided on the portion of the stirring shaft located in the sealing box, a plurality of stirring paddles are provided on the stirring shaft, a spoiler baffle is provided on the stirring paddle connected to the bottom of the stirring shaft, the stirring shaft, the stirring paddle and the spoiler baffle are all hollow and interconnected, and air outlet holes are provided on the stirring paddle and the spoiler baffle.

2. A reaction kettle for chloroprene rubber grafting as claimed in claim 1, characterized in that: The stirring shaft is respectively connected with an upper stirring paddle, a middle stirring paddle and a bottom stirring paddle from top to bottom; two air outlets are respectively arranged at the connection points between the stirring shaft and the upper stirring paddle, the middle stirring paddle and the bottom stirring paddle.

3. A reaction kettle for chloroprene rubber grafting as claimed in claim 2, characterized in that: The two ends of the middle stirring paddle are respectively provided with one air outlet hole, and the two ends of the bottom stirring paddle are respectively provided with two air outlet holes.

4. A reaction kettle for chloroprene rubber grafting as claimed in claim 3, characterized in that: The bottom stirring paddle is evenly provided with three spoiler baffles near the bottom of the kettle, the angle between two of the three spoiler baffles is 120 degrees, and the ends of the three spoiler baffles are all provided with air outlets.

5. A reaction kettle for chloroprene rubber grafting as claimed in claim 4, characterized in that: The inner wall of the reactor is evenly provided with three layers of baffles from top to bottom.

6. The reaction kettle for chloroprene rubber grafting according to claim 1, characterized in that: A solid material feed inlet, a liquid material feed inlet and an exhaust port are arranged above the reactor.

7. The reaction kettle for chloroprene rubber grafting according to claim 1, characterized in that: A finished product packaging port is provided at the bottom of the reaction kettle.

8. The reaction kettle for chloroprene rubber grafting according to claim 1, characterized in that: A finished product packaging port is provided at the bottom of the reaction kettle.

9. The reaction kettle for chloroprene rubber grafting according to claim 1, characterized in that: Two groups of electric heating tubes are arranged at the bottom of the reactor.

Images