Continuous production device of papermaking additive AKD (alkyl ketene dimer) surface sizing agent

Abstract

The utility model discloses a continuous production device of a papermaking additive AKD (alkyl ketene dimer) surface sizing agent, which comprises an outer barrel, an inner barrel and a rotary driving mechanism, and the inner barrel is rotationally and hermetically connected with the outer barrel; a plurality of partition plates are fixed in the outer barrel, an inner cavity of the outer barrel is divided into a plurality of stirring cavities by the partition plates, circulating holes are formed in the partition plates, a stirring assembly is arranged in each stirring cavity, and each stirring assembly comprises a spiral blade, a movable shearing plate, a fixed shearing plate and a flow blocking disc; and a material outlet is formed in the upper part of the other end of the outer cylinder body. By arranging the partition plate and the circulation hole, the effect of reducing the flow speed of the raw materials can be achieved, and the stirring time of the raw materials in the stirring cavity is prolonged without increasing the length of the device, so that the stirring and mixing effect is improved; when the material is discharged from the material outlet, the material is continuously fed from the material inlet, so that continuous production can be realized; the device is small in overall size, small in occupied space, low in cost and suitable for being used in a small site.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical synthesis, in particular to a continuous production device of a papermaking auxiliary agent AKD surface sizing agent. Background Art

[0002] AKD, or alkyl ketene dimer, is an excellent neutral reactive synthetic sizing agent. It is used in papermaking in the form of an emulsion, which can impart water resistance to paper and effectively improve its strength, softness, durability and printability.

[0003] The prior art AKD production scheme includes two production methods: intermittent and continuous. The intermittent production method is as follows: add measured toluene and triethylamine to the reactor, add measured stearoyl chloride dropwise through the pipeline under stirring conditions, adopt circulating water cooling and control the dropping speed to keep the material temperature in the reactor at 60-65°C, the dropping and insulation time is 8 hours in total, and after the reaction is completed, further purify to obtain the AKD product. The intermittent production process has the disadvantages of poor product quality repeatability, large differences in batch product purity, and long production cycle.

[0004] The patent with application number CN201621131149.4 discloses a continuous production device for papermaking auxiliary agent AKD, including a stearoyl chloride storage tank, a toluene storage tank, a triethylamine storage tank and several pipeline reactors connected in series. The first pipeline reactor is used as a mixer for toluene and stearoyl chloride. Stearoyl chloride and toluene are added to the pipeline reactor from material inlet I through their respective mass flow meters. Triethylamine enters the first pipeline reactor from material inlet II through its mass flow meter, and then reacts. After sufficient reaction in at least two pipeline reactors, AKD crude product is continuously discharged from the discharge port of the last pipeline reactor, and AKD finished product is obtained after purification.

[0005] The above patent uses a pipeline reactor to mix the raw materials during the flow process. Although continuous production can be achieved, the overall size of the device is large, the space occupied is large, and the cost is high, so it is necessary to make improvements. Utility Model Content

[0006] Based on this, it is necessary to provide a continuous production device for the surface sizing agent of papermaking auxiliary agent AKD in order to solve the above technical problems.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a continuous production device for a papermaking auxiliary agent AKD surface sizing agent, comprising an outer cylinder, an inner cylinder and a rotary drive mechanism, wherein the inner cylinder passes through the outer cylinder and is coaxially arranged with the outer cylinder, the inner cylinder is rotatably sealed and connected with the outer cylinder, and the rotary drive mechanism drives the inner cylinder to rotate; a plurality of partitions are fixed in the outer cylinder along its length direction, the partitions divide the inner cavity of the outer cylinder into a plurality of stirring chambers, flow holes are opened on the partitions, and the stirring chambers are connected through the flow holes, and a stirring assembly is arranged in each stirring chamber, the stirring assembly comprises a spiral blade, and the spiral blade is fixedly mounted on the inner cylinder; a feed port is arranged at the upper part of one end of the outer cylinder, and a discharge port is arranged at the upper part of the other end of the outer cylinder.

[0008] Preferably, the rotary drive mechanism comprises a driving motor, a driving pulley, a driven pulley and a transmission belt, the driving pulley is installed at the output end of the driving motor, the driven pulley is installed on the inner cylinder, and the driving pulley and the driven pulley are connected by a transmission belt.

[0009] Preferably, rotating joints are installed at both ends of the inner cylinder.

[0010] Preferably, the feed port and the discharge port are both arranged at the top end of the outer cylinder.

[0011] Preferably, the stirring assembly further comprises a movable shear plate and a fixed shear plate, a plurality of evenly distributed movable shear plates are fixed on the circumference of the inner cylinder, and a fixed shear plate cooperating with the movable shear plate is fixed on the inner wall of the outer cylinder.

[0012] Preferably, the flow holes are provided in plurality.

[0013] Preferably, the stirring assembly further comprises a baffle plate, which is fixedly mounted on the inner cylinder, and is slidably and sealingly connected to the partition plate, and the baffle plate is provided with conducting holes corresponding to the flow holes one by one.

[0014] Preferably, a discharge pipe is installed at the discharge port, and a flow meter and a solenoid valve are installed on the discharge pipe.

[0015] Compared with the prior art, this technical solution has at least one of the following beneficial effects:

[0016] The raw materials are added into the outer cylinder through the feed port, and the raw materials flow by themselves and pass through each stirring chamber in turn under the thrust of the spiral blades, and are finally discharged from the discharge port. While the discharge port is discharging the materials, the feed port is continuously charged, so that continuous production can be achieved;

[0017] By setting up partitions and flow holes, the flow rate of raw materials can be reduced. Without increasing the length of the device, the stirring time of the raw materials in the stirring chamber can be increased, thereby improving the stirring and mixing effect; the overall volume of the device is small, the space occupied is small, the cost is low, and it is suitable for use in smaller sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0019] Figure 2 for Figure 1 Sectional view along line AA;

[0020] Figure 3 for Figure 1 Sectional view along line BB;

[0021] In the figure, 1. outer cylinder; 11. feed inlet; 12. discharge outlet; 13. discharge pipe; 14. flow meter; 15. solenoid valve; 2. inner cylinder; 3. partition; 31. flow hole; 4. stirring chamber; 5. stirring assembly; 51. spiral blade; 52. movable shear plate; 53. fixed shear plate; 54. baffle plate; 55. conduction hole; 6. rotary drive mechanism; 61. drive motor; 62. driving pulley; 63. driven pulley; 64. transmission belt; 7. rotary joint. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0023] See also Figures 1 to 3The embodiment of the present application provides a continuous production device of a papermaking auxiliary agent AKD surface sizing agent, including an outer cylinder 1, an inner cylinder 2 and a rotary drive mechanism 6. A leg is fixed to the lower part of the outer cylinder 1. The inner cylinder 2 passes through the outer cylinder 1 and is coaxially arranged with the outer cylinder 1. The inner cylinder 2 is rotatably sealed and connected to the outer cylinder 1 through a bearing or an oil seal. The rotary drive mechanism 6 drives the inner cylinder 2 to rotate; a plurality of partitions 3 are fixed in the outer cylinder 1 along its length direction. The partitions 3 divide the inner cavity of the outer cylinder 1 into a plurality of stirring chambers 4. The inner cylinder 2 passes through the partitions 3. The inner cylinder 2 and the partitions 3 are rotatably sealed. The inner cylinder 2 is connected, or the inner cylinder 2 and the partition 3 are gap-matched, and a small amount of material can flow through the gap between the inner cylinder 2 and the partition 3; the partition 3 is provided with a flow hole 31, and each stirring chamber 4 is connected through the flow hole 31, and each stirring chamber 4 is provided with a stirring assembly 5, and the stirring assembly 5 includes a spiral blade 51, and the spiral blade 51 is fixedly installed on the inner cylinder 2; the upper part of one end of the outer cylinder 1 is provided with a feed port 11, and the upper part of the other end of the outer cylinder 1 is provided with a discharge port 12, and the discharge port 12 is set to three, which can be used for three kinds of raw materials to enter, and can also be set to one, two, or four in other embodiments. A refrigerant is introduced into the inner cylinder 2, and the refrigerant can be cooling water. The refrigerant exchanges heat with the raw materials through the inner cylinder 2, absorbs the heat generated by the reaction of the raw materials, and keeps the temperature of the material in the outer cylinder 1 suitable.

[0024] In this embodiment, the inner cylinder 2 is driven to rotate by the rotary drive mechanism 6, and the raw material is added into the outer cylinder 1 through the feed port 11. The raw material first enters the first stirring chamber 4, and the inner cylinder 2 drives the spiral blade 51 to rotate. The spiral blade 51 stirs the raw material and squeezes and pushes the raw material to move toward the discharge port 12. The raw material enters the next stirring chamber 4 through the flow hole 31 until it moves to the last stirring chamber 4 connected to the discharge port 12 and is discharged from the discharge port 12. While the discharge port 12 is discharging the material, the feed port 11 continues to add material to achieve continuous production.

[0025] By providing the partition 3 and the flow hole 31, the flow rate of the raw material can be reduced, and the stirring time of the raw material in the stirring chamber 4 can be increased, thereby improving the stirring and mixing effect. The overall volume of the device is small, the space occupied is small, and the cost is low.

[0026] In a preferred embodiment, to drive the inner cylinder 2 to rotate, refer to Figure 1 The rotary drive mechanism 6 includes a driving motor 61, a driving pulley 62, a driven pulley 63 and a transmission belt 64. The driving pulley 62 is installed at the output end of the driving motor 61, and the driven pulley 63 is installed on the inner cylinder 2. The driving pulley 62 and the driven pulley 63 are connected by a transmission belt 64. The driving motor 61 drives the driving pulley 62 to rotate, and the driving pulley 62 drives the driven pulley 63 and the inner cylinder 2 to rotate through the transmission belt 64.

[0027] In a preferred embodiment, in order to facilitate the inner cylinder 2 to always communicate with the refrigerant during the rotation process, please refer to Figure 1 , both ends of the inner cylinder 2 are provided with rotary joints 7. The rotary joints 7 are connected with the refrigerant pipeline to facilitate the circulation of refrigerant into the inner cylinder 2.

[0028] In a preferred embodiment, in order to facilitate the mixing chamber 4 to be filled with raw materials, the mixing chamber 4 below the discharge port 12 can be discharged only after the material is fully stored. Figures 1 to 3 The feed port 11 and the discharge port 12 are both arranged at the top of the outer cylinder 1. The feed port 11 is arranged at the top of the outer cylinder 1 to prevent leakage of materials in the stirring chamber 4 below the feed port 11 when the materials are not full. The discharge port 12 is arranged at the top of the outer cylinder 1 so that the materials can be discharged only after the stirring chamber 4 below the discharge port 12 is full of materials, thereby preventing the materials from flowing out in advance and improving the material mixing effect.

[0029] In a preferred embodiment, the material mixing effect can be further improved. Figure 1 and Figure 2 The stirring assembly 5 further includes a movable shear plate 52 and a fixed shear plate 53. A plurality of evenly distributed movable shear plates 52 are fixed on the circumference of the inner cylinder 2, and a fixed shear plate 53 cooperating with the movable shear plate 52 is fixed on the inner wall of the outer cylinder 1. When the inner cylinder 2 rotates, the movable shear plate 52 is driven to rotate, and the movable shear plate 52 stirs the material when it rotates. When the movable shear plate 52 rotates, the fixed shear plate 53 is matched with the gap of the fixed shear plate 53, and the material is sheared, so that the material is fully mixed.

[0030] To avoid the situation that a flow hole 31 is provided and the flow hole 31 is blocked so that the material cannot flow, please refer to Figure 3 , a plurality of flow holes 31 are provided. At the same time, in order to avoid the situation where too many flow holes 31 are provided, resulting in an increase in the flow volume and the material being discharged before the stirring time is insufficient, please refer to 1 and Figure 3 The stirring assembly 5 further includes a baffle plate 54, which is fixedly mounted on the inner cylinder 2, and is slidably sealed with the baffle plate 3. The baffle plate 54 is provided with conducting holes 55 corresponding to the flow holes 31. The flow holes 31 are unevenly distributed on the baffle plate 54. When the baffle plate 54 rotates, most of the flow holes 31 are closed. At the same time, only a small number of flow holes 31 connected with the conducting holes 55 can flow. As the baffle plate 54 rotates, the conducting holes 55 at different positions are connected with the corresponding flow holes 31 for flow, so that materials at different positions in a cross section of the stirring chamber 4 can flow, thereby avoiding blockage and not increasing the flow rate.

[0031] The fixed shear plate 53 is fitted with the spoiler disk 54 in a clearance, and can also scrape off part of the material attached to the spoiler disk 54, thereby reducing the adhesion of the material and allowing the material to be fully mixed.

[0032] In a preferred embodiment, in order to facilitate the control of the discharge and the detection of the discharge flow rate, please refer to Figures 1 to 3 , a discharge pipe 13 is installed at the discharge port 12, and a flow meter 14 and a solenoid valve 15 are installed on the discharge pipe 13. The discharge pipe 13 is L-shaped, and the flow meter 14 is installed on the vertical section of the discharge pipe 13, which is convenient for accurately detecting the discharge flow rate. When the material is fed for the first time for production, the material may not be stirred enough and flow to the discharge port 12. At this time, the solenoid valve 15 can be closed first to block the discharge pipe 13 to prevent the material from being discharged when it is not fully stirred. After a period of time, the solenoid valve 15 is opened again to discharge the material, and then the material can be discharged while replenishing the raw materials to achieve continuous production.

[0033] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] 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 at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A continuous production device for papermaking auxiliary agent AKD surface sizing agent, characterized in that: The invention comprises an outer cylinder (1), an inner cylinder (2) and a rotary drive mechanism (6), wherein the inner cylinder (2) passes through the outer cylinder (1) and is coaxially arranged with the outer cylinder (1), the inner cylinder (2) and the outer cylinder (1) are rotatably sealed and connected, and the rotary drive mechanism (6) drives the inner cylinder (2) to rotate; a plurality of partitions (3) are fixed inside the outer cylinder (1) along its length direction, the partitions (3) divide the inner cavity of the outer cylinder (1) into a plurality of stirring cavities (4), the partitions (3) are provided with flow holes (31), the stirring cavities (4) are connected through the flow holes (31), and a stirring assembly (5) is provided inside each stirring cavity (4), the stirring assembly (5) comprises a spiral blade (51), and the spiral blade (51) is fixedly mounted on the inner cylinder (2); a feed port (11) is provided at the upper portion of one end of the outer cylinder (1), and a discharge port (12) is provided at the upper portion of the other end of the outer cylinder (1).

2. The continuous production device of the papermaking auxiliary agent AKD surface sizing agent according to claim 1, characterized in that: The rotary drive mechanism (6) comprises a driving motor (61), a driving pulley (62), a driven pulley (63) and a transmission belt (64); the driving pulley (62) is mounted on the output end of the driving motor (61); the driven pulley (63) is mounted on the inner cylinder (2); the driving pulley (62) and the driven pulley (63) are connected to each other via a transmission belt (64).

3. The continuous production device of the papermaking auxiliary agent AKD surface sizing agent according to claim 1, characterized in that: Rotating joints (7) are installed at both ends of the inner cylinder (2).

4. The continuous production device of the papermaking auxiliary agent AKD surface sizing agent according to claim 1, characterized in that: The feed port (11) and the discharge port (12) are both arranged at the top end of the outer cylinder (1).

5. The continuous production device of the papermaking auxiliary agent AKD surface sizing agent according to claim 1, characterized in that: The stirring assembly (5) further comprises a movable shear plate (52) and a fixed shear plate (53); a plurality of evenly distributed movable shear plates (52) are fixed to the circumference of the inner cylinder (2); and a fixed shear plate (53) cooperating with the movable shear plate (52) is fixed to the inner wall of the outer cylinder (1).

6. The continuous production device of the papermaking auxiliary agent AKD surface sizing agent according to claim 5, characterized in that: A plurality of flow holes (31) are provided.

7. The continuous production device of the papermaking auxiliary agent AKD surface sizing agent according to claim 6, characterized in that: The stirring assembly (5) further comprises a baffle plate (54), wherein the baffle plate (54) is fixedly mounted on the inner cylinder (2), the baffle plate (54) is slidably and sealingly connected to the partition plate (3), and the baffle plate (54) is provided with conducting holes (55) corresponding one-to-one to the flow holes (31).

8. The continuous production device of the papermaking auxiliary agent AKD surface sizing agent according to claim 1, characterized in that: A discharge pipe (13) is installed at the discharge port (12), and a flow meter (14) and a solenoid valve (15) are installed on the discharge pipe (13).

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