CN215842958U

CN215842958U - Waterborne polyurethane dispersion prepolymerization device

Info

Publication number: CN215842958U
Application number: CN202121644947.8U
Authority: CN
Inventors: 韩波
Original assignee: Zhenjiang Desheng New Material Technology Co ltd
Current assignee: Zhenjiang Desheng New Material Technology Co ltd
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2022-02-18
Anticipated expiration: 2031-07-20

Abstract

The utility model relates to a pre-polymerization device for aqueous polyurethane dispersion, which comprises a tank body, wherein the top of the tank body is provided with a feed inlet and a motor component, the motor component is connected with a stirring shaft, the bottom of the tank body is provided with a discharge pipe, the stirring shaft is provided with a plurality of first hoops and second hoops, a plurality of support rods of the first hoops are sequentially deflected and arranged, the bottoms of the support rods are provided with V-shaped scrapers, one side of the tail ends of the support rods is provided with spiral scrapers which are spirally wound around the stirring shaft and are close to the inner wall of the tank body, a support plate of the second hoop is provided with a plurality of screw rods connected with the inner wall of the corresponding spiral scrapers, the screw rods are sequentially deflected and arranged at intervals, the V-shaped scrapers and the spiral scrapers which are sequentially deflected and arranged on the first hoops and the second hoops play a role in scraping the wall surfaces of the bottom and the side walls, and control the valve energy of the first three-way valve, the second three-way valve, the stirring range and turbulence are increased, the prepolymerization efficiency and the uniformity of the aqueous polyurethane dispersion are improved, and wall surface deposition is avoided.

Description

Waterborne polyurethane dispersion prepolymerization device

Technical Field

The utility model relates to a pre-polymerization device for an aqueous polyurethane dispersion, and belongs to the technical field of aqueous polyurethane production equipment.

Background

The leather finishing agent is a general name of leather auxiliary agents for leather surface finishing protection and leather beautification, and is prepared by a film forming substance, a coloring material, a solvent and auxiliary agents according to a certain proportion, wherein the film forming substance is the basis of the leather finishing agent, polyurethane is a high molecular compound formed by the action of polyisocyanate and a multi-element compound, and because ammonia-hydrogen bonds exist among macromolecules, the polymer of the polyurethane has good properties of strength, wear resistance, solvent resistance and the like, so that the polyurethane is particularly applied to high-grade leather as the finishing agent. The waterborne polyurethane is a polyurethane system which takes water to replace an organic solvent as a dispersion medium, the polyurethane is prepolymerized into a prepolymer with larger molecular weight during production, and then the prepolymer is dispersed in the water and is subjected to emulsion formed by water or diamine chain extension, the viscosity is increased due to the increase of the molecular weight during prepolymerization, a wall-sticking phenomenon often exists in a prepolymerization device by adopting a common single stirring device, and low molecular weight components in the polymer are more concentrated on the wall of a tank to influence the prepolymerization heat transfer, mass transfer efficiency and uniformity of a polyurethane dispersion.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pre-polymerization device for aqueous polyurethane dispersion, aiming at the defects of the prior art, wherein a V-shaped scraper and a spiral scraper which are sequentially arranged on a first hoop and a second hoop in a deflection way have the functions of scraping the wall surfaces of the bottom and the side wall, can circularly stir, increase the stirring range and turbulence, improve the pre-polymerization efficiency and the uniformity of the aqueous polyurethane dispersion and avoid the wall surface deposition.

The utility model is realized by the following technical scheme:

a pre-polymerization device for an aqueous polyurethane dispersion comprises a tank body, wherein a feed inlet and a motor assembly are arranged at the top of the tank body, the motor assembly is connected with a stirring shaft positioned in the tank body, a discharge pipe is arranged at the bottom of the tank body, a plurality of first hoops and second hoops which are arranged at intervals are arranged on the stirring shaft, a support rod is arranged on one side of each first hoop, the support rods of the first hoops are sequentially arranged in a deflection manner, a V-shaped scraper which protrudes downwards is arranged at the bottom of each support rod, and a spiral scraper which winds around the stirring shaft and is close to the inner wall of the tank body is arranged on one side of the tail end of each support rod;

the second hoop is connected with the first hoop in an opposite mode, a supporting plate is arranged at the bottom of the second hoop, a plurality of screw rods connected with the inner wall of the corresponding spiral scraper are arranged on the supporting plate, and the plurality of screw rods corresponding to the spiral scraper are sequentially deflected from the top to the bottom in the direction at intervals;

the stirring shaft is provided with a first boss positioned at the bottom of the first hoop, the bottom of the support plate and the top of the second hoop, the first boss is provided with a second boss in limit fit with the side wall of the support plate, and the cross section of the support plate is of a fan-shaped structure;

a jacket is arranged outside the tank body, a side top part is arranged at the side bottom of the jacket and is provided with a heating medium inlet and outlet, and a condensation port, a thermometer port, an air pressure port and a standby port are arranged at the top of the tank body;

be equipped with first three-way valve on the discharging pipe, first three-way valve is connected with first pipeline, first tube coupling has the circulating pump, the circulating pump is equipped with the second pipeline with jar body top, be equipped with the second three-way valve on the second pipeline, the second three-way valve is connected with the sampling tube, be equipped with the third three-way valve on the second pipeline, the third three-way valve is connected with the material supplementing pipe.

The utility model has the beneficial effects that:

(1) a feeding hole or a valve energy of a third three-way valve is controlled, a second pipeline communicated with a tank body is communicated with a material supplementing pipe, a water-based polyurethane dispersion prepolymerization reaction raw material is fed into the tank body through the material supplementing pipe, the third three-way valve and the second pipeline, a condensation port, a thermometer interface and an air pressure interface are respectively connected with a condenser, a thermometer and an air circuit and are respectively used for reducing loss of volatile components for condensation, detecting temperature and ensuring air pressure and reaction atmosphere, a plurality of V-shaped scrapers and spiral scrapers which deflect in sequence are arranged below a first boss and a second boss in a limiting mode by a first hoop and a second hoop, the valve energy of the first three-way valve, the second three-way valve and the third three-way valve is controlled, and a sampling pipe is used for detecting or circulating prepolymer or discharging to increase exchange mass transfer efficiency;

(2) the V-arrangement scraper plays the increase stirring volume and horizontal gyration flow along with the (mixing) shaft rotation, do benefit to and increase mass transfer heat transfer efficiency, the V-arrangement scraper of bottommost is close to jar body bottom and is the arc structure and plays to strike off antiseized effect to jar body bottom material system, the spiral scraper is close to jar internal portion when the (mixing) shaft is rotatory and strikes off antiseized effect, increase stirring scope and axial flow, and increase turbulence through the shearing action of screw rod and V-arrangement scraper circulation, improve waterborne polyurethane dispersion prepolymerization efficiency and homogeneity, avoid the wall deposit.

Drawings

FIG. 1 is a block diagram of the present invention.

FIG. 2 is a top view of the present invention.

Fig. 3 is a top perspective view of the mixing shaft of the present invention.

Fig. 4 is a bottom perspective view of the agitator shaft of the present invention.

The labels in the figure are: the utility model provides a jar body 1, feed inlet 2 and motor element 3, (mixing) shaft 4, discharging pipe 5, first staple bolt 6 and second staple bolt 7, bracing piece 8, V-arrangement scraper 9, spiral scraper 10, reinforcing plate 11, support frame 12, backup pad 13, screw rod 14, first boss 15, second boss 16, press from both sides cover 17, heat medium import and export 18, first three-way valve 19, first pipeline 20, circulating pump 21, second pipeline 22, second three-way valve 23, sampling tube 24, third three-way valve 25, feed supplement pipe 26, condensate port 27, thermometer interface 28, atmospheric pressure interface 29 and reserve mouth 30.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

A pre-polymerization device for an aqueous polyurethane dispersion comprises a tank body 1, wherein a feed inlet 2 and a motor assembly 3 are arranged at the top of the tank body 1, the motor assembly 3 is connected with a stirring shaft 4 positioned in the tank body 1, a discharge pipe 5 is arranged at the bottom of the tank body 1, a plurality of first hoops 6 and second hoops 7 which are arranged at intervals are arranged on the stirring shaft 4, a support rod 8 is arranged on one side of each first hoop 6, the support rods 8 of the first hoops 6 are sequentially arranged in a deflection manner, a V-shaped scraper 9 which protrudes downwards is arranged at the bottom of each support rod 8, and a spiral scraper 10 which spirals around the stirring shaft 4 and is close to the inner wall of the tank body 1 is arranged on one side of the tail end of each support rod 8;

a reinforcing plate 11 which is obliquely arranged with the supporting rod 8 is arranged in the V-shaped scraper 9, the V-shaped scraper 9 at the bottommost is close to the bottom of the tank body 1 and is of an arc structure, and a supporting frame 12 which is positioned at the bottom of a supporting plate 13 is arranged between the bottom of the stirring shaft 4 and the bottom of the tank body 1;

the second hoop 7 is connected with the first hoop 6 in an opposite direction, a supporting plate 13 is arranged at the bottom of the second hoop 7, a plurality of screw rods 14 connected with the inner wall of the corresponding spiral scraper 10 are arranged on the supporting plate 13, and the plurality of screw rods 14 corresponding to the spiral scraper 10 are sequentially arranged at intervals in a deflection manner from the top to the bottom;

a first boss 15 positioned at the bottom of the first hoop 6, the bottom of the support plate 13 and the top of the second hoop 7 is arranged on the stirring shaft 4, a second boss 16 in limit fit with the side wall of the support plate 13 is arranged on the first boss 15, and the section of the support plate 13 is of a fan-shaped structure;

a jacket 17 is arranged outside the tank body 1, a heating medium inlet and outlet 18 is arranged at the side top part of the bottom part of the jacket 17, and a condensation port 27, a thermometer port 28, an air pressure port 29 and a standby port 30 are arranged at the top part of the tank body 1;

be equipped with first three-way valve 19 on discharging pipe 5, first three-way valve 19 is connected with first pipeline 20, first pipeline 20 is connected with circulating pump 21, circulating pump 21 is equipped with second pipeline 22 with jar body 1 top, be equipped with second three-way valve 23 on the second pipeline 22, second three-way valve 23 is connected with sampling tube 24, be equipped with third three-way valve 25 on the second pipeline 22, third three-way valve 25 is connected with material supplementing pipe 26.

The working principle of the utility model is as follows:

referring to the attached drawings, a feed inlet 2 or controlling the valve energy of a third three-way valve 25 enables a second pipeline 22 communicated with a tank body 1 to be communicated with a material supplementing pipe 26, water-based polyurethane dispersion prepolymerization reaction raw materials are fed into the tank body 1 through the material supplementing pipe 26, the third three-way valve 25 and the second pipeline 22, a heat medium with a certain temperature is fed into a jacket 17 through a heat medium inlet and outlet 18 to carry out reaction and heat preservation in the tank body 1, a condensation port 27, a thermometer interface 28 and an air pressure interface 29 are respectively connected with a condenser, a thermometer and an air passage and are respectively used for reducing the loss of volatile components for condensation, detecting the temperature and ensuring the air pressure and the reaction atmosphere, and a spare port 30 is used for spare feeding or cleaning;

the stirring shaft 4 is coaxially connected and driven to rotate in the tank body 1 by a motor shaft of the motor component 3, the first hoops 6 and the second hoops 7 are limited and guaranteed to be positioned and installed through the top or the bottom and a first boss 15 of the stirring shaft 4, the side wall of the supporting plate 13 is limited and matched with a second boss 16 to guarantee an installation angle, the first hoops 6 and the second hoops 7 are connected and matched with bolts to be embraced outside the stirring shaft 4, the supporting rods 8 of the first hoops 6 are sequentially installed in a deflection mode, the V-shaped scrapers 9 and the spiral scrapers 10 on the supporting rods 8 are sequentially installed in a deflection mode, the bottom of the stirring shaft 4 is rotatably supported with the bottom of the tank body 1 through the supporting frame 12, and the rotation stability is guaranteed;

the V-shaped scrapers 9 protrude towards the bottom of the support rod 8, the structural strength is improved by the reinforcing plates 11, the stirring amount and the horizontal revolving flow are increased along with the rotation of the stirring shaft 4, the mass and heat transfer efficiency is increased, and the bottommost V-shaped scrapers 9 are close to the bottom of the tank body 1 and are in an arc structure to play a role in scraping and preventing adhesion to a material system at the bottom of the tank body 1;

the end part of the spiral scraper 10 is fixedly connected with the support rod 8 and is supported by a plurality of screw rods 14 which are sequentially deflected and arranged at intervals on the support plate 13, so that the spiral scraper 10 is close to the inner part of the tank body 1 to play a role of scraping and preventing adhesion when rotating along with the stirring shaft 4, the stirring range and axial flow are increased, and turbulence is increased through the shearing action of the screw rods 14 and the circulation of the V-shaped scraper 9, so that the prepolymerization of the aqueous polyurethane dispersion is promoted;

controlling the valve of the first three-way valve 19 to enable the discharging pipe 5 connected with the tank body 1 to be communicated with the first pipeline 20, controlling the valve of the second three-way valve 23 to enable the pre-polymerization system in the tank body 1 to flow into the second pipeline 22 through the discharging pipe 5 and the first three-way valve 19 under the pumping of the circulating pump 21, controlling the valve of the second three-way valve 23 to enable the second pipeline 22 to be communicated with the sampling pipe 24, enabling the pre-polymerization in the second pipeline 22 to flow into the sampling pipe 24 through the second three-way valve 23 so as to be convenient for sampling detection, controlling the valve of the second three-way valve 23 to enable the end of the sampling pipe 24 to be cut off, controlling the valve of the third three-way valve 25 to enable the end of the feed pipe 26 to be cut off, enabling the pre-polymerization in the second pipeline 22 to circularly flow into the top of the tank body 1, increasing the material flow exchange and mass transfer efficiency of the pre-polymerization of the upper and lower layers in the tank body 1, improving the pre-polymerization efficiency and uniformity of the aqueous polyurethane dispersion, avoiding wall surface deposition, controlling the valve of the first three-way valve 19 to enable the first pipeline 20 to be cut off, the final feed liquid is discharged via a discharge pipe 5.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The pre-polymerization device for the waterborne polyurethane dispersion comprises a tank body (1), wherein a feed inlet (2) and a motor assembly (3) are arranged at the top of the tank body (1), the motor assembly (3) is connected with a stirring shaft (4) positioned inside the tank body (1), a discharge pipe (5) is arranged at the bottom of the tank body (1), and the pre-polymerization device is characterized in that a plurality of first hoops (6) and second hoops (7) which are arranged at intervals are arranged on the stirring shaft (4), a support rod (8) is arranged on one side of each first hoop (6), the support rods (8) of the first hoops (6) are sequentially deflected, a downward convex V-shaped scraper (9) is arranged at the bottom of each support rod (8), and a spiral scraper (10) which is spirally wound around the stirring shaft (4) and is close to the inner wall of the tank body (1) is arranged on one side of the tail end of each support rod (8);

second staple bolt (7) and first staple bolt (6) opposite direction connection, second staple bolt (7) bottom are equipped with backup pad (13), be equipped with a plurality of and correspond screw rod (14) that spiral scraper (10) inner wall links to each other on backup pad (13), by top to bottom direction, a plurality of screw rod (14) that spiral scraper (10) correspond deflect the interval setting in proper order.

2. The pre-polymerization device for the aqueous polyurethane dispersion according to claim 1, wherein the stirring shaft (4) is provided with a first boss (15) located at the bottom of the first hoop (6), the bottom of the support plate (13) and the top of the second hoop (7), the first boss (15) is provided with a second boss (16) in limit fit with the side wall of the support plate (13), and the cross section of the support plate (13) is of a fan-shaped structure.

3. The pre-polymerization device for the aqueous polyurethane dispersion according to claim 1, wherein the V-shaped scraper (9) is internally provided with a reinforcing plate (11) which is obliquely arranged with the support rod (8), and the bottommost V-shaped scraper (9) is close to the bottom of the tank body (1) and has an arc structure.

4. The pre-polymerization device for the aqueous polyurethane dispersion according to claim 1, wherein a support frame (12) is arranged between the bottom of the stirring shaft (4) and the bottom of the tank body (1) and is positioned at the bottom of the support plate (13).

5. The pre-polymerization device for aqueous polyurethane dispersion according to claim 1, wherein a jacket (17) is provided outside the tank (1), and a side bottom of the jacket (17) is provided with a side top thereof provided with a heat medium inlet/outlet (18).

6. The pre-polymerization device for aqueous polyurethane dispersion according to claim 1, wherein the top of the tank (1) is provided with a condensation port (27), a thermometer port (28), a pneumatic port (29) and a spare port (30).

7. The pre-polymerization device for the aqueous polyurethane dispersion according to any one of claims 1 to 6, wherein a first three-way valve (19) is disposed on the discharging pipe (5), the first three-way valve (19) is connected with a first pipeline (20), the first pipeline (20) is connected with a circulating pump (21), and a second pipeline (22) is disposed between the circulating pump (21) and the top of the tank body (1).

8. The pre-polymerization device for aqueous polyurethane dispersion according to claim 7, wherein a second three-way valve (23) is provided on the second pipe (22), and a sampling pipe (24) is connected to the second three-way valve (23).

9. The pre-polymerization device for aqueous polyurethane dispersion according to claim 7, wherein a third three-way valve (25) is disposed on the second pipeline (22), and the third three-way valve (25) is connected to a feeding pipe (26).