Adjustable stirring device for producing acrylic emulsion

Abstract

The utility model discloses an adjustable stirring device for producing acrylic emulsion, and relates to the technical field of chemical engineering devices. The technical key points are as follows: reaction materials in the reaction kettle are stirred and dispersed through the internal and external combination of the internal stirring unit and the external stirring unit which are arranged on the transmission shaft, so that the reaction materials in the reaction kettle generate large-range vortexes, and liquid flow mixing and dispersing in the range of the whole kettle are formed. The inner stirring unit and the outer stirring unit can carry out independent stirring control, the rotating speed of the inner stirring unit and the rotating speed of the outer stirring unit can be flexibly adjusted according to reaction systems with different viscosities, and the device can adapt to various polymerization scenes and is beneficial for obtaining products with consistent molecular weight distribution and particle size.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical engineering devices, and particularly relates to an adjustable stirring device for producing acrylic emulsion. 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 reactor.

[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 reactor equipment, the flow and dispersion effect of the stirring equipment in the reactor directly determines the product quality of the emulsion. Most of the existing stirring devices for emulsion polymerization adopt a single stirring paddle, with poor mass transfer and dispersion effects, poor molecular weight distribution and particle size consistency of the emulsion, and it is difficult to meet the production requirements of high-quality emulsions. In addition, for different acrylic viscosity systems or product systems, it is difficult for the existing production equipment to make adaptability adjustments and cannot meet the switching of products with different viscosities. Content of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide an adjustable stirring device for producing acrylic emulsion to solve the problems mentioned in the background technique.

[0005] The above object of the utility model is achieved through the following technical solutions:

[0006] An adjustable stirring device for producing acrylic emulsion, including a stirring reactor, a first transmission shaft is arranged in the stirring reactor, the upper end of the first transmission shaft is connected with a first driving device, the first transmission shaft is rotationally connected with the stirring reactor, a connecting fastener is sleeved and fixedly connected on the first transmission shaft, an outer stirring unit and an inner stirring unit are connected to the first transmission shaft, the outer stirring unit is connected to the connecting fastener, the outer stirring unit includes a plurality of upper paddle plates, and a plurality of vertical paddle plates are connected to the upper paddle plates, a lower paddle plate is connected to one end of the vertical paddle plate far away from the upper paddle plate, and a plurality of transverse paddle plates are arranged on the inner side of the vertical paddle plate.

[0007] The utility model can be further configured in a preferred example as follows: there is an included angle α between the transverse paddle plate and the horizontal plane, and the angle α is 15-60°, preferably 45°.

[0008] In a preferred embodiment, the present utility model can be further configured as follows: the inner stirring unit includes a second transmission shaft, the second transmission shaft is connected to the first transmission shaft through a second bearing, the other end of the second transmission shaft penetrates the bottom of the stirring reactor and is connected with a second driving device, a plurality of mounting sleeves are installed on the second transmission shaft, and each mounting sleeve is fixedly connected with an inclined blade inner paddle.

[0009] In a preferred embodiment, the present utility model can be further configured as follows: there is an included angle α between the inclined blade inner paddle and the horizontal plane, and the angle of the included angle α is 15 - 60°, preferably 45°.

[0010] In a preferred embodiment, the present utility model can be further configured as follows: the edge of the inclined blade inner paddle is provided with a folded tail fin.

[0011] In a preferred embodiment, the present utility model can be further configured as follows: a first bearing is sleeved on the second transmission shaft, and a plurality of the lower paddles are all connected to the outer shaft of the first bearing.

[0012] In a preferred embodiment, the present utility model can be further configured as follows: there is an included angle between the vertical paddle and the axis of the first transmission shaft, and the included angle is 15 - 45°, preferably 30°.

[0013] In a preferred embodiment, the present utility model can be further configured as follows: the lower paddle is arc-shaped.

[0014] In summary, the present utility model includes at least one of the following beneficial technical effects:

[0015] Through the installed outer stirring unit and inner stirring unit, the internal and external combination can stir and disperse the reaction materials in the kettle, causing large-scale vortices in the reaction materials in the reaction kettle and forming liquid flow mixing and dispersion in the whole kettle range;

[0016] The outer stirring unit can perform independent stirring control, and can flexibly adjust the rotation speeds of the inner and outer stirring units according to reaction systems with different viscosities, can adapt to a variety of polymerization scenarios, and helps to obtain products with consistent molecular weight distribution and particle size. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 is a schematic top view structure diagram of the stirrer of the present utility model;

[0019] Figure 3 is a schematic diagram of the angle of the horizontal paddle or the inclined blade inner paddle flipping relative to the horizontal plane;

[0020] Figure 4 is an axonometric view of the inclined blade paddle stirrer.

[0021] Reference numerals: 1, stirring reaction kettle; 100, outer stirring unit; 1001, upper paddle; 1002, lower paddle; 1003, vertical paddle; 1004, horizontal paddle; 1005, connecting fastener; 1006, first transmission shaft; 1007, first bearing; 200, inner stirring unit; 2001, inclined inner paddle; 2002, second transmission shaft; 2003, second bearing. Specific embodiments

[0022] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0023] As Figures 1-4 shown, a disclosed adjustable stirring device for producing acrylic emulsion according to the present technical solution includes a stirring reaction kettle 1. The stirring reaction kettle 1 has a cylindrical structure. A first transmission shaft 1006 is provided in the stirring reaction kettle 1. The upper end of the first transmission shaft 1006 is connected to a first driving device (not shown in the figure). The first transmission shaft 1006 is rotatably connected to the stirring reaction kettle 1. A connecting fastener 1005 is sleeved and fixedly connected on the first transmission shaft 1006. An outer stirring unit 100 and an inner stirring unit 200 are connected to the first transmission shaft 1006. The outer stirring unit 100 is connected to the connecting fastener 1005. The inner stirring unit 200 is located inside the outer stirring unit 100. The two are arranged in an interleaved manner, do not interfere with each other, and form a certain hollow area. The two stirring units can move relative to each other to achieve a better stirring effect on the material.

[0024] The outer stirring unit 100 includes a plurality of upper paddles 1001. The upper paddles 1001 are connected to the connecting fastener 1005. A plurality of upper paddles 1001 are connected with vertical paddles 1003. The vertical paddles 1003 are vertically arranged. Two vertical paddles 1003 are symmetrically arranged with the first transmission shaft 1006 as the axis of symmetry. The vertical paddle 1003 is a rectangular strip-shaped plate member. The vertical paddle 1003 forms an angle with the axis of the first transmission shaft 1006, and the angle is 15 - 45°, preferably 30°. The inclined arrangement increases the stirring area, increases the contact area between the liquid and the paddle, generates stronger liquid driving force and shear force during the stirring process, helps to break up the lumps in the liquid, and promotes the uniform dispersion of substances.

[0025] One end of the vertical paddle 1003 away from the upper paddle 1001 is connected to the lower paddle 1002. The inner side of the lower paddle 1002 is connected to the outer side of the first bearing 1007. The main function of setting the lower paddle 1002 is to support and stabilize the overall external stirring unit 100. Several transverse paddles 1004 are arranged on the inner side of the vertical paddle 1003. The transverse paddle 1004 is installed on the vertical paddle 1003 and forms a hollow frame structure with the transmission shaft, with low flow resistance during rotation. The bottom of the lower paddle 1002 is set at a certain angle or arc, which helps to lift the materials at the bottom of the reactor and avoid sedimentation.

[0026] At least one group of transverse paddles 1004 is provided, preferably 2 - 3 groups. The transverse paddles 1004 are installed on the vertical paddle 1003 and are arranged roughly horizontally. There is a certain distance between the inner side of the transverse paddle 1004 and the transmission shaft. There is an included angle α between the transverse paddle 1004 and the horizontal plane, and the angle of the included angle α is 15 - 60°, preferably 45°. The flip design of the transverse paddle 1004 relative to the horizontal plane causes the liquid to flow up and down, promoting the reaction and improving the reaction efficiency.

[0027] The inner stirring unit 200 includes a second transmission shaft 2002. The second transmission shaft 2002 is connected to the first transmission shaft 1006 through a second bearing. The other end of the second transmission shaft 2002 penetrates the bottom of the stirring reactor 1 and is connected to a second driving device (not shown in the figure). The upper end of the second transmission shaft 2002 can be set as a hollow structure. The lower end of the first transmission shaft 1006 is inserted into the hollow structure at the upper end of the second transmission shaft 2002 and is connected and installed through the second bearing 2003. Through the set second bearing 2003, the relative independent rotation of the inner stirring unit 200 and the outer stirring unit 100 can be realized. A number of mounting sleeves are installed on the second transmission shaft 2002, and an inclined - blade inner paddle 2001 is fixedly connected to each mounting sleeve. The inclined - blade inner paddles 2001 are symmetrically installed on both sides of the transmission shaft. There is an included angle α between the inclined - blade inner paddle 2001 and the horizontal plane, and the angle of the included angle α is 15 - 60°, preferably 45°. The flip design of the inclined - blade inner paddle 2001 relative to the horizontal plane causes the liquid to flow up and down. The directions of the flips of the inclined - blade inner paddles 2001 on both sides relative to the horizontal plane are opposite. Such a structure can generate axial flow fields with multiple different flow directions near the inclined - blade inner paddle 2001, and the liquid stirring and dispersion effect is better. The edge of the inclined - blade inner paddle 2001 is provided with a folded tail wing. The tail wing is beneficial to the stirring effect. The inclined - blade inner paddle 2001 generates a large - range vortex in the central area of the reactor, avoiding the existence of dead zones in the central area.

[0028] An access hole and a feed port are arranged at the top of the reactor, and a discharge port is arranged at the lower end. Such designs can all adopt existing technologies, so they will not be elaborated here.

[0029] The embodiments of the specific implementation manners are all preferred embodiments of the present utility model, and do not limit the protection scope of the present utility model. Therefore, all equivalent changes made according to the structure, shape, and principle of the present utility model shall be covered within the protection scope of the present utility model.

Claims

1. An adjustable stirring device for producing acrylic emulsion, comprising a stirred reactor (1), wherein a first transmission shaft (1006) is provided in the stirred reactor (1), a first driving device is connected to the upper end of the first transmission shaft (1006), and the first transmission shaft (1006) is rotatably connected to the stirred reactor (1), characterized in that: A connecting fastener (1005) is sleeved on and fixedly connected to the first transmission shaft (1006); an external stirring unit (100) and an internal stirring unit (200) are connected to the first transmission shaft (1006); the external stirring unit (100) is connected to the connecting fastener (1005); the external stirring unit (100) comprises a plurality of upper paddle boards (1001); and the plurality of upper paddle boards (1001) are connected to vertical paddle boards (1003); an end of the vertical paddle board (1003) away from the upper paddle board (1001) is connected to a lower paddle board (1002); and a plurality of transverse paddle boards (1004) are provided on the inner side of the vertical paddle board (1003).

2. The adjustable stirring device for producing acrylic emulsion according to claim 1, characterized in that: There is an angle α between the transverse paddle (1004) and the horizontal plane, and the angle α is 15-60°, preferably 45°.

3. The adjustable stirring device for producing acrylic emulsion according to claim 2, characterized in that: The internal stirring unit (200) comprises a second transmission shaft (2002), the second transmission shaft (2002) being connected to the first transmission shaft (1006) via a second bearing, the other end of the second transmission shaft (2002) passing through the bottom of the stirring reactor (1) and being connected to a second driving device, a plurality of mounting sleeves being mounted on the second transmission shaft (2002), and each mounting sleeve being fixedly connected to an inclined blade inner paddle (2001).

4. The adjustable stirring device for producing acrylic emulsion according to claim 3, characterized in that: There is an angle α between the inclined blade inner paddle board (2001) and the horizontal plane, and the angle α is 15-60°, preferably 45°.

5. The adjustable stirring device for producing acrylic emulsion according to claim 3, characterized in that: The edge of the inclined blade inner paddle board (2001) is provided with a folded tail wing.

6. The adjustable stirring device for producing acrylic emulsion according to claim 3, characterized in that: The second transmission shaft (2002) is sleeved with a first bearing (1007), and the plurality of lower paddle plates (1002) are all connected to the outer shaft of the first bearing (1007).

7. The adjustable stirring device for producing acrylic emulsion according to claim 1, characterized in that: An included angle is formed between the vertical paddle (1003) and the axis of the first transmission shaft (1006), and the included angle is 15-45°, preferably 30°.

8. The adjustable stirring device for producing acrylic emulsion according to claim 1, characterized in that: The lower paddle plate (1002) is arranged in an arc shape.

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