Reaction kettle for uniformly synthesizing and processing waterborne polyurethane dispersoid

Abstract

The utility model relates to the technical field of synthesis and processing of waterborne polyurethane dispersoid, in particular to a reaction kettle for uniformly synthesizing and processing waterborne polyurethane dispersoid, which comprises a reaction kettle body, a water supply component for supplying water into the reaction kettle body and a transmission component for stirring, and the reaction kettle body comprises a stirring rod and a water tank; the reaction kettle is characterized in that the water supply assembly further comprises a piston type water pump, the water inlet end of the piston type water pump is connected with the water tank, and the water outlet of the piston type water pump is connected to the reaction kettle body; the piston-type water pump comprises a piston rod; the transmission assembly is connected with the stirring rod and the piston rod and used for converting the rotating motion of the stirring rod into linear reciprocating motion in the axis direction. According to the technical scheme, water flow can be automatically added into the kettle body of the reaction kettle when the kettle body of the reaction kettle performs mixing work, so that water and a waterborne polyurethane dispersion are better mixed and diluted, and meanwhile, the situation that the waterborne polyurethane dispersion in the kettle body of the reaction kettle is too sticky to damage a motor is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of synthesis and processing of waterborne polyurethane dispersions, in particular to a reaction kettle for uniform synthesis and processing of waterborne polyurethane dispersions. Background Art

[0002] Waterborne polyurethane is a new type of polyurethane system that uses water instead of organic solvent as a dispersion medium. It is also called water-dispersed polyurethane, water-based polyurethane or water-based polyurethane. Waterborne polyurethane uses water as a solvent and has the advantages of being pollution-free, safe and reliable, having excellent mechanical properties, good compatibility, and easy to modify. Because waterborne polyurethane needs to be continuously added to improve the mixing degree of waterborne polyurethane during mixing, a reactor for uniform synthesis and processing of waterborne polyurethane dispersion is required.

[0003] A Chinese patent (CN211099004U) discloses a waterborne polyurethane dispersion reactor which uses a double-screw stirring system with a frame-type scraper stirring system to disperse the material well in a relatively short time, thus solving the problem of poor production stability of waterborne polyurethane dispersions caused by dispersibility issues.

[0004] However, in actual use, the above structure is not convenient for automatically adding water to the mixture in the reactor, which causes the mixture in the reactor to have a high viscosity and is difficult to mix and stir. On the one hand, it increases the resistance to stirring and mixing, and on the other hand, it reduces the effect of the mixing processing of the aqueous polyurethane dispersion, which may cause the aqueous polyurethane dispersion to coagulate. Utility Model Content

[0005] In view of the above problems, a reaction kettle for uniform synthesis and processing of waterborne polyurethane dispersion is provided. The problem of the need for manual water injection beside the equipment when stirring the waterborne polyurethane dispersion is solved by a piston water pump. On the other hand, the viscosity of the waterborne polyurethane dispersion is prevented from increasing due to the delayed addition of water.

[0006] In order to solve the problems of the prior art, the utility model provides a reactor for uniformly synthesizing and processing an aqueous polyurethane dispersion, comprising a reactor body, a water supply assembly for supplying water to the reactor body, and a transmission assembly for stirring, wherein the reactor body comprises a stirring rod and a water tank; the water supply assembly also comprises a piston water pump, the water inlet end of the piston water pump is connected to the water tank, and the water outlet of the piston water pump is connected to the reactor body; the piston water pump comprises a piston rod; the transmission assembly connects the stirring rod and the piston rod, and the transmission assembly is used to convert the rotational motion of the stirring rod into a linear reciprocating motion in the axial direction.

[0007] Preferably, the transmission assembly includes a Scotch yoke mechanism, a rotating shaft and a bevel gear pair; the Scotch yoke mechanism is arranged on the reactor body, and the output end of the Scotch yoke mechanism is connected to the piston rod; the rotating shaft is rotatably arranged on the reactor body, one end of the rotating shaft is connected to the input end of the Scotch yoke mechanism, and the other end of the rotating shaft is connected to a rotating driver that drives the rotating shaft to rotate; one end of the bevel gear pair is transmission-connected to the Scotch yoke mechanism, and the other end of the bevel gear pair is respectively connected to the rotating shaft and the stirring rod.

[0008] Preferably, a pair of piston water pumps are provided and arranged facing each other, the piston rods of the two piston water pumps are respectively connected to a pair of output ends of the Scotch yoke mechanism, and the axes of the two piston water pumps are parallel.

[0009] Preferably, the piston water pump includes a cylinder body, a piston plate, a water inlet pipe and a water outlet pipe; the cylinder body is arranged on the reactor body; the piston plate is slidably arranged in the cylinder body, one end of the piston plate is connected to the piston rod, and the sliding of the piston plate divides the interior of the cylinder body into a first chamber and a second chamber with the piston plate as the interval; one end of the water inlet pipe is connected to the first chamber, the other end of the water inlet pipe is connected to the water tank, and a one-way valve for controlling the flow of water in the water inlet pipe is provided in the water inlet pipe; one end of the water outlet pipe is arranged in the reactor body, the other end of the water outlet pipe is connected to the cylinder body, and a one-way valve is provided in the water outlet pipe.

[0010] Preferably, the stirring rod includes a stirring connecting rod, a spiral rod and a scraper; the stirring connecting rod is installed in the reactor body, and the stirring connecting rod is fixedly connected to the outside of the stirring rod; the spiral rod is arranged outside the stirring rod, and the spiral rod is colinear with the axis of the stirring rod; the scraper is installed outside the stirring rod.

[0011] Preferably, the reactor body includes a heating device; the heating device is arranged outside the reactor body, and two heating devices are arranged circumferentially.

[0012] Preferably, the reactor body includes a collecting assembly, which includes a limiting plate and a collecting box; the limiting plate is arranged under the reactor body, and one end of the limiting plate is connected to the bottom of the reactor body; the collecting box is movably placed under the reactor body, and one end of the collecting box is tightly pressed against the limiting plate.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model is provided with a piston water pump and a water tank, which can automatically add water flow to the inside of the reactor body when the reactor body is doing mixing work, so as to better mix and dilute the water and the aqueous polyurethane dispersion, and at the same time avoid the aqueous polyurethane dispersion in the reactor body being too viscous, causing excessive load on the motor and causing damage to the motor.

[0015] 2. The utility model provides a Scotch yoke mechanism to make the piston rod perform linear reciprocating motion in the piston water pump, thereby driving the piston water pump to automatically spray water.

[0016] 3. The utility model can heat the waterborne polyurethane dispersion inside the reactor body by arranging a heating device, so that the waterborne polyurethane dispersion is not easy to agglomerate.

[0017] 4. The utility model can prevent the mixture in the reactor from settling and accumulating at the bottom by arranging the spiral blades during rotation, thereby further improving the stirring effect of the mixture.

[0018] 5. The utility model can evenly scrape the inner wall of the reactor body by arranging a scraper, so as to avoid the mixture in the reactor body sticking to the wall and being difficult to clean.

[0019] 6. The utility model provides a frame and a collection box to facilitate the recycling of the mixed waterborne polyurethane dispersion, thereby solving the problem of human operating errors causing the waterborne polyurethane dispersion to be discharged outside the collection box and causing waste of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram from the first perspective of a reactor for uniform synthesis and processing of waterborne polyurethane dispersion.

[0021] Figure 2 It is a stereoscopic structural diagram from the second perspective of a reactor for uniform synthesis and processing of waterborne polyurethane dispersion.

[0022] Figure 3 It is a front view of a three-dimensional structure diagram of a reactor for uniform synthesis and processing of waterborne polyurethane dispersion.

[0023] Figure 4 It is a longitudinally cut three-dimensional structural diagram of a reactor for uniformly synthesizing and processing waterborne polyurethane dispersion.

[0024] Figure 5 It is a three-dimensional cross-sectional structural diagram of the water tank and piston water pump of a reactor for uniform synthesis and processing of waterborne polyurethane dispersion.

[0025] Figure 6 The present invention is a three-dimensional structural diagram of the Scotch yoke mechanism of a reactor for uniform synthesis and processing of waterborne polyurethane dispersion.

[0026] Figure 7 It is a three-dimensional structural diagram of the scraper and spiral blade of a reactor for uniform synthesis and processing of water-based polyurethane dispersion.

[0027] The numbers in the figure are: 1-reactor body; 2-agitation rod; 3-water supply assembly; 31-water tank; 32-piston water pump; 33-piston rod; 34-cylinder body; 35-piston plate; 36-water inlet pipe; 37-water outlet pipe; 4-transmission assembly; 41-Scotch yoke mechanism; 42-rotating shaft; 43-bevel gear pair; 5-agitation connecting rod; 6-screw rod; 7-scraper; 8-heating device; 9-collection assembly; 91-limiting plate; 92-collection box. DETAILED DESCRIPTION

[0028] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] See also Figure 1-Figure 7 As shown, a reactor for uniform synthesis and processing of waterborne polyurethane dispersion comprises a reactor body 1, a water supply assembly 3 for supplying water to the reactor body 1, and a transmission assembly 4 for stirring, wherein the reactor body 1 comprises a stirring rod 2 and a water tank 31; the water supply assembly 3 further comprises a piston water pump 32, the water inlet end of the piston water pump 32 is connected to the water tank 31, and the water outlet of the piston water pump 32 is connected to the reactor body 1; the piston water pump 32 comprises a piston rod 33; the transmission assembly 4 connects the stirring rod 2 and the piston rod 33, and the transmission assembly 4 is used to convert the rotational motion of the stirring rod 2 into a linear reciprocating motion in the axial direction.

[0030] By arranging the piston water pump 32 and the water tank 31, water flow can be automatically added to the inside of the reactor body 1 for mixing when the reactor body 1 is performing mixing work, so that water and the aqueous polyurethane dispersion can be better mixed and diluted, and at the same time, the aqueous polyurethane dispersion in the reactor body 1 can be prevented from being too viscous, resulting in excessive load on the motor and damage to the motor.

[0031] See also Figure 4-Figure 5 As shown, the transmission assembly 4 includes a Scotch yoke mechanism 41, a rotating shaft 42 and a bevel gear pair 43; the Scotch yoke mechanism 41 is arranged on the reactor body 1, and the output end of the Scotch yoke mechanism 41 is connected to the piston rod 33; the rotating shaft 42 is rotatably arranged on the reactor body 1, one end of the rotating shaft 42 is connected to the input end of the Scotch yoke mechanism 41, and the other end of the rotating shaft 42 is connected to a rotating driver that drives the rotating shaft 42 to rotate; one end of the bevel gear pair 43 is transmission-connected to the Scotch yoke mechanism 41, and the other end of the bevel gear pair 43 is respectively connected to the rotating shaft 42 and the stirring rod 2.

[0032] The rotary driver is arranged on the reactor body 1, and its output shaft is connected to the rotary shaft 42 through a coupling, so that when the rotary shaft 42 rotates, the Scotch yoke mechanism 41 and the bevel gear pair 43 are driven to perform synchronous axial rotation.

[0033] See also Figure 4-Figure 5 As shown, a pair of piston water pumps 32 are provided and arranged facing each other, the piston rods 33 of the two piston water pumps 32 are respectively connected to a pair of output ends of the Scotch yoke mechanism 41, and the axes of the two piston water pumps 32 are parallel.

[0034] The piston rod 33 performs linear reciprocating movement in the two piston water pumps 32 .

[0035] See also Figure 4-Figure 6 As shown, the piston water pump 32 includes a cylinder body 34, a piston plate 35, a water inlet pipe 36 and a water outlet pipe 37; the cylinder body 34 is arranged on the reactor body 1; the piston plate 35 is slidably arranged in the cylinder body 34, one end of the piston plate 35 is connected to the piston rod 33, and the sliding of the piston plate 35 divides the inside of the cylinder body 34 into a first chamber and a second chamber with the piston plate 35 as the interval; one end of the water inlet pipe 36 is connected to the first chamber, the other end of the water inlet pipe 36 is connected to the water tank 31, and a one-way valve for controlling the flow of water in the water inlet pipe 36 is arranged in the water inlet pipe 36; one end of the water outlet pipe 37 is arranged in the reactor body 1, the other end of the water outlet pipe 37 is connected to the cylinder body 34, and a one-way valve is arranged in the water outlet pipe 37.

[0036] When the piston rod 33 and the piston plate 35 move in a straight line in the cylinder body 34, a hollow chamber is formed in the cylinder body 34 on the left side of the piston plate 35. At the same time, the one-way valve in the water inlet pipe 36 opens and the one-way valve in the water outlet pipe 37 closes, so that water flows through the water tank 31 and the water inlet pipe 36 to replenish the piston water pump 32. When the piston rod 33 and the piston plate 35 move in the opposite direction in the cylinder body 34, the one-way valve in the water inlet pipe 36 closes and the one-way valve in the water outlet pipe 37 opens, so that the water replenished in the piston water pump 32 is sprayed into the reactor body 1 through the water outlet pipe 37.

[0037] See also Figure 1-Figure 7 As shown, the stirring rod 2 includes a stirring connecting rod 5, a spiral rod 6 and a scraper 7; the stirring connecting rod 5 is installed in the reactor body 1, and the stirring connecting rod 5 is fixedly connected to the outside of the stirring rod 2; the spiral rod 6 is arranged outside the stirring rod 2, and the spiral rod 6 is colinear with the axis of the stirring rod 2; the scraper 7 is installed outside the stirring rod 2.

[0038] When the stirring rod 2 rotates, it drives the two stirring connecting rods 5 installed outside to rotate, so as to facilitate the uniform mixing of the aqueous polyurethane dispersion. At the same time, the spiral rod 6 can prevent the aqueous polyurethane dispersion from accumulating and settling at the bottom of the reactor body 1, and the setting of the scraper 7 can prevent the aqueous polyurethane dispersion from adhering to the inner wall of the reactor body 1 and being difficult to clean.

[0039] See also Figure 7 As shown, the reactor body 1 includes a heating device 8; the heating device 8 is arranged outside the reactor body 1, and two heating devices 8 are arranged circumferentially.

[0040] By providing the heating device 8, the aqueous polyurethane dispersion inside the reactor body 1 can be heated to prevent the aqueous polyurethane dispersion from agglomerating.

[0041] See also Figure 1-Figure 2 As shown, the reactor body 1 includes a collecting assembly 9, which includes a limiting plate 91 and a collecting box 92; the limiting plate 91 is arranged under the reactor body 1, and one end of the limiting plate 91 is connected to the bottom of the reactor body 1; the collecting box 92 is movably placed under the reactor body 1, and one end of the collecting box 92 is tightly pressed against the limiting plate 91.

[0042] The staff can push the collecting box 92 to the limiting plate 91 to limit the position of the collecting box 92, so as to avoid the aqueous polyurethane dispersion in the reactor body 1 flowing out to the outside of the collecting box 92 due to staff operating errors when discharging the aqueous polyurethane dispersion, thereby avoiding the waste of raw materials.

[0043] The above embodiments only express one or several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. 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 present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the attached claims.

Claims

1. A reactor for uniformly synthesizing and processing an aqueous polyurethane dispersion, comprising a reactor body (1), a water supply component (3) for supplying water to the reactor body (1), and a transmission component (4) for stirring, wherein the reactor body (1) comprises a stirring rod (2) and a water tank (31); characterized in that: The water supply assembly (3) further comprises a piston water pump (32), the water inlet end of the piston water pump (32) being connected to the water tank (31), and the water outlet of the piston water pump (32) being connected to the reactor body (1); the piston water pump (32) comprising a piston rod (33); and a transmission assembly (4) connecting the stirring rod (2) and the piston rod (33), the transmission assembly (4) being used to convert the rotational motion of the stirring rod (2) into linear reciprocating motion in the axial direction.

2. The reaction kettle for uniformly synthesizing and processing an aqueous polyurethane dispersion according to claim 1, characterized in that: The transmission assembly (4) comprises a Scotch yoke mechanism (41), a rotating shaft (42) and a bevel gear pair (43); the Scotch yoke mechanism (41) is arranged on the reactor body (1), and the output end of the Scotch yoke mechanism (41) is connected to the piston rod (33); the rotating shaft (42) is rotatably arranged on the reactor body (1), one end of the rotating shaft (42) is connected to the input end of the Scotch yoke mechanism (41), and the other end of the rotating shaft (42) is connected to a rotating driver for driving the rotating shaft (42) to rotate; one end of the bevel gear pair (43) is transmission-connected to the Scotch yoke mechanism (41), and the other end of the bevel gear pair (43) is respectively connected to the rotating shaft (42) and the stirring rod (2).

3. A reaction kettle for uniform synthesis and processing of aqueous polyurethane dispersion according to claim 2, characterized in that: A pair of piston water pumps (32) are arranged facing each other. The piston rods (33) of the two piston water pumps (32) are respectively connected to a pair of output ends of the Scotch yoke mechanism (41). The axes of the two piston water pumps (32) are parallel.

4. The reaction kettle for uniformly synthesizing and processing an aqueous polyurethane dispersion according to claim 1, characterized in that: The piston water pump (32) comprises a cylinder body (34), a piston plate (35), a water inlet pipe (36) and a water outlet pipe (37); the cylinder body (34) is arranged on the reactor body (1); the piston plate (35) is slidably arranged in the cylinder body (34), one end of the piston plate (35) is connected to the piston rod (33), and the sliding of the piston plate (35) divides the inside of the cylinder body (34) into a first chamber and a second chamber with the piston plate (35) as a partition; one end of the water inlet pipe (36) is connected to the first chamber, the other end of the water inlet pipe (36) is connected to the water tank (31), and a one-way valve for controlling the flow of water in the water inlet pipe (36) is arranged in the water inlet pipe (36); one end of the water outlet pipe (37) is arranged in the reactor body (1), the other end of the water outlet pipe (37) is connected to the cylinder body (34), and a one-way valve is arranged in the water outlet pipe (37).

5. The reaction kettle for uniformly synthesizing and processing an aqueous polyurethane dispersion according to claim 1, characterized in that: The stirring rod (2) comprises a stirring connecting rod (5), a spiral rod (6) and a scraper (7); the stirring connecting rod (5) is installed in the reactor body (1), and the stirring connecting rod (5) is fixedly connected to the outside of the stirring rod (2); the spiral rod (6) is arranged outside the stirring rod (2), and the axis of the spiral rod (6) and the stirring rod (2) are colinear; the scraper (7) is installed outside the stirring rod (2).

6. The reaction kettle for uniformly synthesizing and processing an aqueous polyurethane dispersion according to claim 1, characterized in that: The reactor body (1) comprises a heating device (8); the heating device (8) is arranged outside the reactor body (1), and two heating devices (8) are arranged in a circumferential direction.

7. The reaction kettle for uniformly synthesizing and processing an aqueous polyurethane dispersion according to claim 1, characterized in that: The reactor body (1) comprises a collecting assembly (9), and the collecting assembly (9) comprises a limiting plate (91) and a collecting box (92); the limiting plate (91) is arranged under the reactor body (1), and one end of the limiting plate (91) is connected to the bottom of the reactor body (1); the collecting box (92) is movably placed under the reactor body (1), and one end of the collecting box (92) is tightly abutted against the limiting plate (91).

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