Stirring reaction device for acrylic emulsion production

Abstract

The utility model discloses a stirring reaction device for acrylic emulsion production, and relates to the technical field of chemical equipment. The technical key points are as follows: reaction materials in the kettle are stirred and dispersed in an internal and external combination mode of an inner stirring unit and an outer stirring unit which are mounted on a stirring shaft, the outer stirring unit 100 is used for stirring and dispersing in an external area, the inner stirring unit 200 is used for dispersing in a central area, and the reaction materials in the kettle are stirred in a full range; a large-range vortex is generated, liquid flowing and mixing in the whole kettle range are formed, dead zones are avoided, emulsion polymerization reaction is facilitated, and products with consistent molecular weight distribution and particle size can be obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical engineering devices, and particularly relates to a stirring reaction device for acrylic emulsion production. Background Technique

[0002] Acrylic emulsion is an emulsion copolymerized from acrylate monomers. It is an emulsion with small particle size, multiple uses and excellent performance. It is suitable for a variety of coating formulations, has outstanding water resistance and weather resistance, especially has excellent performance in high-gloss and semi-gloss coatings, and generally needs to be prepared through a stirring reaction kettle.

[0003] In the actual production and application of acrylic emulsion, the particle size and its particle size distribution of the emulsion will directly affect the appearance and water resistance of the emulsion. In actual production, in addition to the raw material formula, the particle size of the finished acrylic emulsion is also related to the preparation process, reaction temperature and stirring speed. Especially for the stirring reaction kettle equipment, the flow and dispersion effect of the stirring equipment in the reaction kettle directly determines the product quality of the emulsion.

[0004] Most of the existing stirring devices for emulsion polymerization adopt a single stirring paddle, and its mass transfer and dispersion effect is poor, the molecular weight distribution and particle size consistency of the emulsion are poor, and it is difficult to meet the production requirements of high-quality emulsions. Content of the Utility Model

[0005] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a stirring reaction device for acrylic emulsion production to solve the problems mentioned in the background technique.

[0006] The above object of the utility model is achieved through the following technical solutions:

[0007] A stirring reaction device for acrylic emulsion production includes a stirring reaction kettle, a stirring shaft is inserted in the stirring reaction kettle and the stirring shaft is rotatable, a driving device is connected to the upper end of the stirring shaft, an inner stirring unit and an outer stirring unit are connected to the stirring shaft, the inner stirring unit is arranged inside the outer stirring unit, the inner stirring unit includes a plurality of blade plates, and the blade plates are inserted on the stirring shaft.

[0008] In a preferred example of the utility model, it can be further configured that: the height of the blade plate on one side close to the stirring shaft is lower than that on its opposite side.

[0009] In a preferred example of the utility model, it can be further configured that: the outer stirring unit includes a plurality of upper paddle plates and a plurality of lower paddle plates, the upper paddle plates and the lower paddle plates are both connected to the stirring shaft, and a vertical paddle plate is connected between each group of upper paddle plates and lower paddle plates.

[0010] In a preferred embodiment, the present utility model can be further configured as follows: a transverse paddle is connected to the side of the vertical paddle close to the stirring shaft, and the transverse paddle does not contact the stirring shaft and does not interfere with the rotation of the blade plate.

[0011] In a preferred embodiment, the present utility model can be further configured as follows: the transverse paddle is arranged to be flipped by an angle α with respect to the horizontal plane A perpendicular to the stirring shaft, and the angle is 15 - 60°, preferably a 45° angle.

[0012] In a preferred embodiment, the present utility model can be further configured as follows: the vertical paddle is arranged to be inclined at a certain angle with respect to the central vertical plane of the stirring shaft, and the angle is 15 - 45°, for example, preferably 30°.

[0013] In summary, the present utility model includes at least one of the following beneficial technical effects:

[0014] Through the internal and external combination of the internal stirring unit and the external stirring unit installed on the stirring shaft, the reaction materials in the kettle are stirred and dispersed, so that large - range vortices are generated in the reaction materials in the reaction kettle, forming liquid flow mixing and dispersion in the whole kettle range, achieving a better mass transfer and dispersion effect, being beneficial to the polymerization reaction of acrylic emulsion, and products with consistent molecular weight distribution and particle size can be prepared. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0016] Figure 2 is a schematic top - view structure diagram of the stirrer of the present utility model;

[0017] Figure 3 is a schematic diagram of the angle of the transverse paddle flipped with respect to the horizontal plane.

[0018] Reference numerals: 1, stirring reaction kettle; 100, external stirring unit; 1001, upper paddle; 1002, lower paddle; 1003, vertical paddle; 1004, transverse paddle; 2, stirring shaft; 200, internal stirring unit; 2001, blade plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0020] As Figures 1-3As shown in the figure, a stirring reaction device for acrylic emulsion production disclosed in the present technical solution includes a stirring reaction kettle 1. The stirring reaction kettle 1 has a cylindrical structure. A stirring shaft 2 is inserted into the stirring reaction kettle 1 and the stirring shaft 2 is rotatable. The upper end of the stirring shaft 2 is connected to a driving device. The transmission equipment is transmitted with the stirring shaft 2 through a connecting shaft and drives the stirring equipment to rotate, so as to stir and disperse the reaction materials in the kettle. A manhole and at least one feed port are arranged at the top of the reaction kettle, and at least one discharge port is arranged at the lower end. These are all conventional accessories of the reactor and will not be elaborated here.

[0021] An inner stirring unit 200 and an outer stirring unit 100 are connected to the stirring shaft 2. The inner stirring unit 200 is placed inside the outer stirring unit 100.

[0022] The outer stirring unit 100 is composed of an upper paddle 1001, a lower paddle 1002, a vertical paddle 1003, and a horizontal paddle 1004. The vertical paddle 1003 is arranged vertically. The upper paddle 1001 and the lower paddle 1002 are both connected to the stirring shaft 2, and a vertical paddle 1003 is connected between each group of the upper paddle 1001 and the lower paddle 1002. A horizontal paddle 1004 is connected to the side of the vertical paddle 1003 close to the stirring shaft 2. At least one group of horizontal paddles 1004 is provided, preferably 2-3 groups. The horizontal paddles 1004 are installed on the vertical paddles 1003 and are arranged substantially horizontally. There is a certain distance between the inner side of the horizontal paddle 1004 and the stirring shaft 2. The horizontal paddle 1004 does not contact the stirring shaft 2 and does not interfere with the rotation of the blade plate 2001.

[0023] The horizontal paddle 1004 is set to be flipped by a certain α angle with respect to the horizontal plane A perpendicular to the stirring shaft 2, and the angle is 15-60°, preferably a 45° angle. The flip design of the horizontal paddle 1004 with respect to the horizontal plane causes the liquid to flow up and down, promoting the reaction and improving the reaction efficiency. Two vertical paddles 1003 are symmetrically arranged with the stirring shaft 2 as the axis of symmetry. The vertical paddle 1003 is a rectangular strip-shaped plate member. The vertical paddle 1003 is inclined at a certain angle with respect to the central vertical plane of the stirring shaft 2, and the angle is 15-45°, for example, preferably 30°. The inclined setting method increases the stirring area and the contact area between the liquid and the paddle. During the stirring process, stronger liquid driving force and shear force are generated, which helps to break up the lumps in the liquid and promote the uniform dispersion of substances. The horizontal paddle 1004 is installed on the vertical paddle 1003 and forms a hollow frame structure with the stirring shaft 2, and has a small flow resistance during rotation. The bottom of the lower paddle is set at a certain angle or arc, which helps to lift the materials at the bottom of the reaction kettle and avoid sedimentation.

[0024] The internal stirring unit 200 includes a number of blade plates, and the blade plates 2001 are inserted on the stirring shaft 2. Arranged along the axial direction of the stirring shaft 2, a plate-type stirrer is provided in the central region close to the stirring shaft 2. The blade plates arranged along the axial direction of the stirring shaft can cause a large-range vortex in the slurry in the reactor, form a flow mixing and dispersion in the whole reactor range, and achieve a better heat transfer, mass transfer, stirring and dispersion effect.

[0025] The height of the blade plate 2001 on the side close to the stirring shaft 2 is lower than that on its opposite side. This setting takes into account the installation convenience of the blade plate 2001 and the stirring shaft 2. In addition, the problem of rotational resistance is also considered, which helps to reduce the resistance.

[0026] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A stirring reaction device for producing acrylic emulsion, comprising a stirring reaction kettle (1), characterized in that: The stirring reaction kettle (1) is provided with a stirring shaft (2) inserted therein and the stirring shaft (2) is rotatable, the upper end of the stirring shaft (2) is connected to a driving device, the stirring shaft (2) is connected to an inner stirring unit (200) and an outer stirring unit (100), the inner stirring unit (200) is arranged inside the outer stirring unit (100), the inner stirring unit (200) comprises a plurality of blade plates (2001), and the blade plates (2001) are inserted on the stirring shaft (2).

2. A stirring reaction device for producing acrylic emulsion according to claim 1, characterized in that: The height of the blade plate on one side close to the stirring shaft (2) is lower than that on the opposite side.

3. A stirring reaction device for producing acrylic emulsion according to claim 1, characterized in that: The external stirring unit (100) comprises a plurality of upper paddle plates (1001) and a plurality of lower paddle plates (1002), wherein the upper paddle plates (1001) and the lower paddle plates (1002) are both connected to the stirring shaft (2), and a vertical paddle plate (1003) is connected between each group of upper paddle plates (1001) and lower paddle plates (1002).

4. A stirring reaction device for producing acrylic emulsion according to claim 3, characterized in that: The vertical paddle plate (1003) is connected to a transverse paddle plate (1004) on one side close to the stirring shaft (2); the transverse paddle plate (1004) does not contact the stirring shaft (2) and does not interfere with the blade plate (2001) when rotating.

5. A stirring reaction device for producing acrylic emulsion according to claim 4, characterized in that: The transverse paddle (1004) is tilted at an angle α relative to a horizontal plane A perpendicular to the stirring shaft (2), the angle being 15-60°, preferably 45°.

6. A stirring reaction device for producing acrylic emulsion according to claim 3, characterized in that: The vertical paddle (1003) is inclined at a certain angle to the central vertical plane of the stirring shaft (2), and the angle is 15-45°, for example, preferably 30°.

Images