CN210595884U

CN210595884U - Continuous production line of polyurethane coating

Info

Publication number: CN210595884U
Application number: CN201921393141.9U
Authority: CN
Inventors: 余淡贤; 黎明; 崔俊文
Original assignee: Foshan Golden Milky Way Intelligent Equipment Co Ltd
Current assignee: Foshan Golden Milky Way Intelligent Equipment Co Ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-05-22
Anticipated expiration: 2029-08-26

Abstract

The application relates to the technical field of polyurethane coatings, in particular to a continuous production line of a polyurethane coating. The application includes: the device comprises a powder drying and dehydrating device, a powder-liquid mixing and drying and dehydrating device, a liquid material dehydrating device, a polymerization device, a liquid material conveying device and a continuous spiral mixing device; the outlet of the material drying and dehydrating device is connected with the front inlet of the continuous spiral mixing device, and the outlet of the liquid mixing, drying and dehydrating device is connected with the front inlet of the continuous spiral mixing device; the outlet of the liquid material dehydration device is respectively connected with the feed inlet of the polymerization device, and the discharge outlet of the polymerization device is respectively connected with the inlet at the middle end and the inlet at the rear end of the continuous spiral mixing device; the outlet of the liquid material conveying device is respectively connected with the inlet at the middle end and the inlet at the rear end of the continuous spiral mixing device. The continuous production line of polyurethane coating of this application can produce polyurethane coating in succession, can carry out abundant dispersion with each raw materials simultaneously, improves polyurethane coating's quality and production efficiency greatly.

Description

Continuous production line of polyurethane coating

Technical Field

The application relates to the technical field of polyurethane coatings, in particular to a continuous production line of a polyurethane coating.

Background

Polyurethane coatings are the common coatings at present and can be divided into two-component polyurethane coatings and one-component polyurethane coatings. Two-component polyurethane coatings are generally composed of two parts, usually referred to as a hardener component and a base component, of an isocyanate prepolymer (also called a low molecular urethane polymer) and a hydroxyl group-containing resin. The paint has a plurality of varieties and wide application range, and can be divided into acrylic polyurethane, alkyd polyurethane, polyester polyurethane, polyether polyurethane, epoxy polyurethane and the like according to the difference of hydroxyl-containing components. Generally has good mechanical properties, higher solid content and better properties in all aspects. Is a paint variety with development prospect at present. The main application directions are wood coatings, automobile repairing coatings, anticorrosive coatings, floor coatings, electronic coatings, special coatings, polyurethane waterproof coatings and the like.

The preparation process of the polyurethane coating comprises two main steps, 1, low polymer polyol participates in the preparation process to form a high molecular weight polyurethane prepolymer; 2. dispersing in solvent under the action of shearing force. The preparation process of double-component polyurethane paint includes preparing various hydroxyl-containing polyol dispersoid or emulsion, adding various assistants (such as catalyst, defoaming agent, leveling agent, plasticizer, solvent, dispersant and other additives) while stirring, stirring to form hydroxyl polyol component, and adding isocyanate component into the hydroxyl polyol component in certain proportion.

In the industrial production, the traditional gap type reaction kettle is mostly adopted for production, all materials such as plasticizer, polyether, heavy ultrafine calcium carbonate, silicon dioxide, nano calcium carbonate and the like are directly added into the reaction kettle in the production process, the material dispersion is poor, the mixing is not uniform, and the materials in the kettle are easy to crust. Due to the physical characteristics of the polyurethane coating, the fluidity of the polyurethane coating becomes very poor under the condition of temperature reduction, an intermittent reaction kettle is adopted for production under the condition of conventional production, 10% of materials are remained in the reaction kettle for the first time, 30% of residual materials are increased for the second time, and only the reaction kettle can be cleaned for the third production; a large amount of waste and high labor cost are caused, and meanwhile, the existing intermittent reaction kettle production mode is difficult to completely disperse nanoscale powder, so that the quality and consistency of the produced polyurethane coating are poor. The production efficiency is low because the current production process is intermittent production.

SUMMERY OF THE UTILITY MODEL

The application provides a continuous production line of polyurethane coating can carry out the continuity production with the raw materials of polyurethane coating, can carry out abundant dispersion with each raw materials simultaneously, improves polyurethane coating's quality and production efficiency greatly.

In view of the above, the present application provides a continuous production line of polyurethane paint, comprising:

the device comprises a plurality of powder drying and dehydrating devices, a plurality of powder-liquid mixing and drying and dehydrating devices, a plurality of liquid material dehydrating devices, a polymerization device, a plurality of liquid material conveying devices and a continuous spiral mixing device;

the outlet of each powder drying and dehydrating device is connected with the front inlet of the continuous spiral mixing device, and the outlet of each powder-liquid mixing, drying and dehydrating device is connected with the front inlet of the continuous spiral mixing device;

the outlet of each liquid material dehydration device is respectively connected with the feed inlet of the polymerization device, and the discharge outlet of the polymerization device is respectively connected with the inlet at the middle end and the inlet at the rear end of the continuous spiral mixing device;

the outlet of each liquid material conveying device is respectively connected with the inlet at the middle end and the inlet at the rear end of the continuous spiral mixing device;

the powder-liquid mixing, drying and dehydrating device comprises a stirring device, a filter, a cooler, a vacuum pump and a drying gas tank; the stirring device is provided with a powder inlet, a liquid inlet, an air inlet and a vacuumizing port; the filter is arranged on the vacuumizing port; the gas inlet of the cooler is connected with the vacuumizing port pipeline through the filter; a gas suction inlet of the vacuum pump is connected with a gas outlet pipeline of the cooler; and a gas outlet of the dry gas tank is connected with a gas inlet pipeline of the stirring device.

Preferably, the powder drying and dehydrating device comprises a stirring device, a filter, a cooler, a vacuum pump and a drying gas tank; the stirring device is provided with a powder inlet, an air inlet and a vacuumizing port; the filter is arranged on the vacuumizing port; the gas inlet of the cooler is connected with the vacuumizing port pipeline through the filter; a gas suction inlet of the vacuum pump is connected with a gas outlet pipeline of the cooler; and a gas outlet of the dry gas tank is connected with a gas inlet pipeline of the stirring device.

Preferably, the liquid material dehydration device comprises a stirring device, a cooler, a vacuum pump and a drying gas tank; the stirring device is provided with a liquid material inlet, an air inlet and a vacuumizing port; the gas inlet of the cooler is connected with the vacuumizing port through a pipeline; a gas suction inlet of the vacuum pump is connected with a gas outlet pipeline of the cooler; and a gas outlet of the dry gas tank is connected with a gas inlet pipeline of the stirring device.

Preferably, the continuous screw mixer is a single screw mixer, a double screw mixer or a multi-screw mixer.

Preferably, the water content of the powder output by each powder drying and dehydrating device is less than or equal to 0.05 percent, the water content of the powder output by each powder-liquid mixing, drying and dehydrating device is less than or equal to 0.05 percent, and the water content of the liquid output by each liquid dehydrating device is less than or equal to 0.05 percent.

Preferably, the stirring device of the powder drying and dehydrating device further comprises a temperature adjusting jacket, and the temperature adjusting jacket is sleeved on the outer wall of the stirring device of the powder drying and dehydrating device; the stirring device of the powder-liquid mixing, drying and dehydrating device further comprises a temperature adjusting jacket, and the temperature adjusting jacket is sleeved on the outer wall of the stirring device of the powder-liquid mixing, drying and dehydrating device; the stirring device of the liquid material dehydration device further comprises a temperature adjusting jacket, and the temperature adjusting jacket is sleeved on the outer wall of the stirring device of the liquid material dehydration device.

Preferably, the continuous production line of the polyurethane coating further comprises a powder metering and conveying device, the powder metering and conveying device comprises a powder weightlessness scale and a powder metering and conveying machine, a discharge port of a stirring device of the powder drying and dewatering device is connected with a feed port of the powder weightlessness scale, a discharge port of the powder weightlessness scale is connected with a feed port of the powder metering and conveying machine, and a discharge port of the powder metering and conveying machine is connected with a front end inlet of the continuous spiral mixing device.

Preferably, the continuous production line of the polyurethane coating further comprises a quantitative powder-liquid pressing device, wherein a discharge port of a stirring device of the powder-liquid mixing, drying and dehydrating device is connected with a feed port of the quantitative powder-liquid pressing device, and a discharge port of the quantitative powder-liquid pressing device is connected with a front-end inlet of the continuous spiral mixing device.

Preferably, the continuous production line of the polyurethane coating further comprises a liquid material metering and conveying device, the liquid material metering and conveying device comprises a liquid material weight loss metering tank and a liquid material metering and conveying pump, a discharge port of the polymerization device is connected with a feed port of the liquid material weight loss metering tank, and the liquid material weight loss metering tank is connected with a middle end inlet and a rear end inlet of the continuous spiral mixing device through the liquid material metering and conveying pump.

Preferably, the continuous production line of the polyurethane coating further comprises a material pressing device and a color mixing device; the discharge port of the continuous spiral mixing device is connected with the feed inlet of the material pressing device, and the discharge port of the material pressing device is connected with the feed inlet of the color mixing and mixing device.

The application designs a continuous production line of polyurethane coating, the application carries out dehydration treatment on powder and liquid of the polyurethane coating independently, the powder and the liquid are easy-to-dehydrate powder and liquid, such as fumed silica, polyether diol or polyether triol and the like, the continuous production line of the polyurethane coating creatively adopts powder and liquid mixing and drying together for dehydration, a powder-liquid mixing, drying and dehydrating device can carry out powder-liquid dehydration on modified nano powder of polyurethane coating difficult to dehydrate, such as modified nano calcium carbonate and heavy ultrafine calcium carbonate and the like, the powder (such as modified nano calcium carbonate) and the liquid (such as plasticizer) which reach preset temperature and are difficult to dehydrate according to preset proportion relation can be respectively put into a stirring device from a powder inlet and a liquid inlet, the stirring device fully mixes the powder and the liquid, the modified nano calcium carbonate is fully and uniformly wetted by the plasticizer, the mixture of the powder and the liquid is heated to be not less than 110 ℃, the water of the mixture is evaporated, the powder and the liquid are fully mixed and reach a preset temperature, a vacuum pump can be started, the vacuum pump carries out vacuumizing treatment on the stirring device, the vacuum degree is less than-0.08 Mpa, the filter can prevent the incompletely mixed powder from being vacuumized away, meanwhile, trace drying gas is supplemented in the vacuumizing process, the drying gas and the stirring device can form an airflow channel, the moisture in the stirring device is favorably brought away, the water vapor attached to the inner wall of the stirring device is vacuumized away, and the dry gas is filled for protection, so that the mixture of the powder and the liquid is prevented from being in contact with air and getting damp again. In the process of vacuumizing, evaporated moisture is pumped to a cooler by virtue of vacuum negative pressure and condensed into condensed water to be discharged; agitating unit passes through the stirring effect, makes the surface of the mixture of powder and liquid material incessantly update, constantly takes away the moisture of the mixture of powder and liquid material, utilizes the mixed stoving dewatering device of powder liquid of this application, through detecting, can be less than 0.5 thousandths with the mixture dehydration of powder and liquid material to the water content. The powder-liquid mixing, drying and dehydrating device can quickly and efficiently realize dehydration of the powder and the liquid of the modified nano powder which is difficult to dehydrate, improves the production efficiency and the product quality, and enables the powder and the liquid to reach lower water content, thereby improving the quality and the quality guarantee period of products. Then the dehydrated powder, powder liquid and liquid are conveyed to a continuous spiral mixing device through a pipeline, liquid materials (such as auxiliary agents, catalysts, accelerators, latent curing agents, solvent oil and the like) which do not need to be dehydrated are conveyed into the continuous spiral mixing device through the liquid material conveying device, and the powder liquid are conveyed to the front end of the continuous spiral mixing device, the dehydrated liquid material and the liquid material which does not need to be dehydrated are conveyed to the middle part and the rear end of the continuous spiral mixing device, this kind of mixed mode makes staying that the powder can be more for a long time in continuous spiral mixing arrangement, mixes more evenly, and the material of polyurethane coating passes through inside conveying unit, mixing unit, dispersion unit, the shearing unit of continuous spiral mixing arrangement with the material misce bene, reaches the product quality requirement, is provided with the vacuum mouth among the continuous spiral mixing arrangement, discharges the material after mixing through the vacuum.

According to the technical scheme, the method has the following advantages:

1. the utility model discloses a continuous spiral mixing arrangement realizes having improved production efficiency greatly to polyurethane coating's continuous automated production, has reduced artifical intensity of labour, has reduced polyurethane coating and has hung a class material and remain extravagant.

2. The utility model discloses a powder liquid mixes stoving dewatering device realizes directly toasting the dehydration that is difficult to the modified nanometer powder of dehydration to the water content is less than 0.5 thousandth, improves product quality.

3. The utility model discloses can be convenient through adjustment process parameter, satisfy the viscosity requirement that the customer changed for thick liquids uniformity and homogeneity are better, have improved polyurethane coating's product uniformity, make product quality more stable.

4. Because the continuous spiral mixing device is adopted to carry out the procedures of dispersing, mixing, shearing, kneading and vacuumizing on the materials, the working efficiency is high, the produced product has better dispersing effect, and the product quality is improved.

5. The utility model discloses a polyurethane coating's continuous production line adopts the totally enclosed design, stops air and material contact, and the material skinning is stopped to the waste of effectual reduction material, improves the quality of product.

6. The utility model can avoid the phenomenon of hanging flow in the reaction kettle and the like due to the poor fluidity of the polyurethane coating, thereby causing material waste through the continuous spiral mixing device (such as a double spiral mixing device) with the self-cleaning function; the addition amount of the filler can be adjusted according to the process, the physical properties of finished products are improved, and meanwhile, the operation cost of enterprises can be greatly reduced.

Drawings

FIG. 1 is a block diagram of a continuous production line for polyurethane coating provided in the examples of the present application;

FIG. 2 is a structural diagram of the powder-liquid mixing, drying and dehydrating device shown in FIG. 1;

FIG. 3 is a structural diagram of a powder material metering and conveying device provided in this embodiment;

fig. 4 is a structural diagram of a liquid material dewatering device and a polymerization device provided in this embodiment;

FIG. 5 is a structural view of a continuous screw mixing apparatus provided in this embodiment;

fig. 6 is a structural diagram of a powder-liquid quantitative pressing device and a booster pump provided in this embodiment;

fig. 7 is a structural diagram of the material pressing device and the color mixing device provided in this embodiment.

Detailed Description

The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless explicitly stated or limited otherwise; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

It should be understood that, in the application of the present application to a production system of polyurethane paint, please refer to fig. 1-2, fig. 1 is a structural diagram of a continuous production line of polyurethane paint provided in an embodiment of the present application, and fig. 2 is a structural diagram of a powder-liquid mixing, drying and dewatering device of fig. 1, as shown in fig. 1-2, an embodiment of the present application includes: the device comprises a plurality of powder drying and dehydrating devices 1, a plurality of powder-liquid mixing and drying and dehydrating devices 2, a plurality of liquid material dehydrating devices 3, a polymerization device 4, a plurality of liquid material conveying devices 5 and a continuous spiral mixing device 6; the outlet of each powder drying and dehydrating device 1 is connected with the front inlet 6-1 of the continuous spiral mixing device, and the outlet of each powder-liquid mixing, drying and dehydrating device 2 is connected with the front inlet 6-1 of the continuous spiral mixing device; the outlet of each liquid material dehydration device 3 is respectively connected with the feed inlet of a polymerization device 4, and the discharge outlet of the polymerization device 4 is respectively connected with the inlet 6-2 at the middle end and the inlet 6-3 at the rear end of the continuous spiral mixing device; the outlet of each liquid material conveying device 5 is respectively connected with the inlet 6-2 at the middle end and the inlet 6-3 at the rear end of the continuous spiral mixing device; the powder-liquid mixing, drying and dehydrating device 2 comprises a stirring device 2-1, a filter 2-2, a cooler 2-3, a vacuum pump 2-4 and a dry gas tank 2-5; the stirring device 2-1 is provided with a powder inlet 2-6, a liquid inlet 2-7, an air inlet 2-8 and a vacuum pumping port 2-9; the filter 2-2 is arranged on the vacuumizing port 2-9; a gas inlet of the cooler 2-3 is connected with the vacuumizing port 2-9 through a filter 2-2; a gas suction inlet of the vacuum pump 2-4 is connected with a gas outlet pipeline of the cooler 2-3; the gas outlet of the drying gas tank 2-5 is connected with the gas inlet 2-8 of the stirring device through a pipeline. The stirring device 2-1 is a stirrer with a heating function.

The application designs a continuous production line of polyurethane coating, which carries out dehydration treatment on powder and liquid of the polyurethane coating separately, wherein the powder and liquid are easy-to-dehydrate powder and liquid, such as fumed silica, polyether diol or polyether triol and the like, the continuous production line of the polyurethane coating creatively adopts powder and liquid mixing and drying together for dehydration, and a powder-liquid mixing, drying and dehydrating device can carry out powder-liquid dehydration on modified nano powder of polyurethane coating which is difficult to dehydrate, such as modified nano calcium carbonate and heavy ultrafine calcium carbonate and the like, so that the powder (such as modified nano calcium carbonate) and liquid (such as plasticizer) which reach a preset temperature and are difficult to dehydrate according to a preset proportion relation are respectively fed into a stirring device 2-1 from a powder inlet 2-6 and a liquid inlet 2-7, the stirring device 2-1 fully mixes the powder material and the liquid material to ensure that the modified nano calcium carbonate is fully and uniformly wetted by the plasticizer, the mixture of the powder material and the liquid material is heated to be not less than 110 ℃, the moisture of the mixture is evaporated, the vacuum pump 2-4 can be started when the powder material and the liquid material are fully mixed and reach a preset temperature, the vacuum pump 2-4 carries out vacuum-pumping treatment on the stirring device 2-1 to ensure that the vacuum degree is less than-0.08 Mpa, the filter 2-2 can prevent the incompletely mixed powder material from being vacuumized away, meanwhile, trace dry gas is supplemented in the vacuum-pumping process, the dry gas and the stirring device 2-1 can form an airflow channel to be beneficial to the moisture in the stirring device 2-1 to be taken away, the water vapor attached to the inner wall of the stirring device 2-1 is vacuumed away, and the dry gas is filled for protection, the mixture of powder and liquid is prevented from moisture regain after contacting with air. In the process of vacuumizing, evaporated moisture is pumped to a cooler 2-3 by virtue of vacuum negative pressure and condensed into condensed water to be discharged; agitating unit 2-1 is through the stirring effect, makes the surface of the mixture of powder and liquid material incessantly update, constantly takes away the moisture of the mixture of powder and liquid material, utilizes the mixed stoving dewatering device of powder liquid of this application, through detecting, can dehydrate the mixture of powder and liquid material to the water content is less than 0.5 thousandth. The powder-liquid mixing, drying and dehydrating device can quickly and efficiently realize dehydration of the powder and the liquid of the modified nano powder which is difficult to dehydrate, improves the production efficiency and the product quality, and enables the powder and the liquid to reach lower water content, thereby improving the quality and the quality guarantee period of products. Then the dehydrated powder, powder liquid and liquid are conveyed into a continuous spiral mixing device 6 through pipelines, liquid materials (such as auxiliary agents, catalysts, accelerators, latent curing agents, solvent oil and the like) which do not need to be dehydrated are conveyed into a continuous spiral mixing device 6 through a liquid material conveying device 5, and the powder liquid are conveyed to the front end of the continuous spiral mixing device 6, the dehydrated liquid material and the liquid material which does not need to be dehydrated are conveyed to the middle part and the rear end of the continuous spiral mixing device 6, this kind of mixed mode makes the powder can be more for a long time stop in continuous spiral mixing arrangement 6, mixes more evenly, and the material of polyurethane coating passes through 6 inside conveying unit, mixing unit, dispersion unit, the shearing unit of continuous spiral mixing arrangement and with material misce bene, reaches product quality requirement, is provided with the vacuum mouth in the continuous spiral mixing arrangement 6, and the material after will mixing through the vacuum is discharged.

Specifically, the filter 2-2 may be a pulse back-flushing filter, or may be another conventional filter capable of isolating powder from being pumped out of the vacuum-pumping ports 1-4, and the specific type of the filter 4 is not described in detail in this application.

For convenience of understanding, the stirring device 2-1 in the embodiment of the present application may be a double-shaft stirring device, and the double-shaft stirring device includes a first stirring shaft, a second stirring shaft, a first stirring blade, a second stirring blade, and a driving device; the driving device is respectively connected with the first stirring shaft and the second stirring shaft; the first stirring blade is arranged on the first stirring shaft, and the second stirring blade is arranged on the second stirring shaft. The double-shaft stirring device can ensure that the powder and the liquid are mixed more uniformly. Wherein, can be according to the actual need of powder or liquid material, agitating unit 2-1 in the embodiment of this application also can be the agitating unit that triaxial, four-axis or (mixing) shaft are more, and agitating unit 2-1's stirring leaf in the embodiment of this application can be the individual layer design, and the agitating unit of triaxial (mixing) shaft and the agitating unit of four-axis (mixing) shaft are similar with the structure of biax agitating unit, are the design of three (mixing) shafts respectively, and four (mixing) shafts. In addition, the stirring device can also be designed to be double-layer, three-layer or more layers of stirring blades. Specifically, the stirring blade single layer design is that a stirring blade sets up on the (mixing) shaft, and the stirring blade double-layer design is two stirring blades, sets up on the (mixing) shaft apart from presetting the distance between two stirring blades, and stirring blade three-layer design is similar with the double-layer design of stirring blade.

Specifically, biax agitating unit's drive arrangement can be for bi-motor or other can drive first (mixing) shaft and second (mixing) shaft take place synchronous or conventional drive arrangement of asynchronous mixing motion now, and this application is not repeated for drive arrangement's specific type is done one by one.

Furthermore, in the embodiment of the application, the device further comprises a buffer tank, wherein a gas outlet of the buffer tank is connected with a gas suction inlet pipeline of the vacuum pump 2-4, and a gas inlet of the buffer tank is connected with a gas outlet pipeline of the cooler 2-3. When the buffer tank makes the mixed dewatering device evacuation of this application, make vacuum environment more stable, owing to at material dehydration in-process, need high temperature heating dehydration, the vapor of production cools off through the cooler, forms the comdenstion water, and the comdenstion water can also be collected to the buffer tank, avoids the comdenstion water to get into the vacuum pump in, makes whole device more stable and safe.

Specifically, the powder drying and dehydrating device 1 can be a common powder drying and dehydrating device, the embodiment of the application also provides a specific powder drying and dehydrating device 1, the powder drying and dehydrating device 1 and the powder-liquid mixing, drying and dehydrating device 2 have the same structure, and the powder drying and dehydrating device 1 comprises a stirring device, a filter, a cooler, a vacuum pump and a drying gas tank; the stirring device is provided with a powder inlet, an air inlet and a vacuumizing port; the filter is arranged on the vacuumizing port; the gas inlet of the cooler is connected with the vacuumizing port pipeline through a filter; a gas suction inlet of the vacuum pump is connected with a gas outlet pipeline of the cooler; and a gas outlet of the dry gas tank is connected with a gas inlet pipeline of the stirring device.

Specifically, the liquid material dehydration device 3 may be a common liquid material dehydration device, the embodiment of the present application further provides a specific structure of the liquid material dehydration device 3, the liquid material dehydration device 3 is similar to the powder-liquid mixing, drying and dehydration device 2 in structure, and the liquid material dehydration device 3 includes a stirring device, a cooler, a vacuum pump and a dry gas tank; the stirring device is provided with a liquid material inlet, an air inlet and a vacuumizing port; the gas inlet of the cooler is connected with a vacuum-pumping port pipeline; a gas suction inlet of the vacuum pump is connected with a gas outlet pipeline of the cooler; and a gas outlet of the dry gas tank is connected with a gas inlet pipeline of the stirring device. One or more polyurethane coating liquid materials are proportionally added into a stirring device of the liquid material dehydration device 3, the stirring device of the liquid material dehydration device 3 can adopt a kneader, a mixing stirrer or a reaction kettle, etc., the polyurethane coating liquid materials are uniformly mixed by a stirring paddle of the stirring device of the liquid material dehydration device 3, and the stirring device of the liquid material dehydration device 3 can adopt a heat conduction oil heating or infrared electric heating mode to heat the polyurethane coating liquid materials to be not less than 110 ℃ so as to evaporate the water in the materials; the mixer is provided with a vacuum pumping port, the vacuum degree is less than-0.080 Mpa, and the evaporated moisture is pumped out and discharged by vacuum negative pressure. One or more air inlets can be arranged in the stirring device of the liquid material dehydration device 3, the air inlets are connected with a dry gas tank, dry gas such as dry nitrogen is supplemented during vacuumizing, an airflow channel can be formed, and moisture in the liquid material dehydration device 3 can be taken out. The liquid material is protected by filling dry nitrogen to prevent the liquid material from contacting with air and getting damp again. Through liquid material dewatering device 3 of this application, can effectively be less than 0.5% (like polyether diol, polyether triol etc.) with the moisture content of multiple liquid material independent dehydration.

For convenience of understanding, please refer to fig. 5, fig. 5 is a structural diagram of the continuous spiral mixing device provided in this embodiment, specifically, the continuous spiral mixing device 6 is a conventional spiral mixer, the continuous spiral mixing device 6 may be a single-head spiral mixer, a double-head spiral mixer, or a multi-head spiral mixer, the multi-head spiral mixer may be a three-head, four-head, or five-head spiral mixer, and a connection manner of each spiral mixer of the double-head spiral mixer and the multi-head spiral mixer is a conventional connection manner, which is not described in detail in this embodiment of the present application.

Specifically, the water content of the powder output by each powder drying and dehydrating device 1 is less than or equal to 0.05%, the water content of the powder output by each powder-liquid mixing, drying and dehydrating device 2 is less than or equal to 0.05%, and the water content of the liquid output by each liquid dehydrating device 3 is less than or equal to 0.05%.

Specifically, the stirring devices of each powder drying and dehydrating device 1, each powder-liquid mixing and drying and dehydrating device 2 and each liquid material dehydrating device 3 are temperature-adjustable stirring machines, the temperature-adjustable stirring machines can be internally provided with heat conduction heating or infrared electric heating equipment, and the stirring devices of the powder drying and dehydrating devices 1 can be heated in a jacket manner and also comprise temperature adjusting jackets, and the temperature adjusting jackets are sleeved on the outer walls of the stirring devices of the powder drying and dehydrating devices 1; the stirring device of the powder-liquid mixing, drying and dehydrating device 2 further comprises a temperature adjusting jacket, and the temperature adjusting jacket is sleeved on the outer wall of the stirring device of the powder-liquid mixing, drying and dehydrating device 2; the stirring device of the liquid material dehydration device 3 also comprises a temperature adjusting jacket which is sleeved on the outer wall of the stirring device of the liquid material dehydration device 3; and introducing a high-temperature or low-temperature medium I into the jacket to adjust the temperature of the materials in the stirrer.

For convenience of understanding, please refer to fig. 3, where fig. 3 is a structural diagram of a powder metering and conveying device provided in this embodiment, the continuous production line of a polyurethane coating in this embodiment further includes a powder metering and conveying device, the powder metering and conveying device includes a powder weightlessness scale 7 and a powder metering conveyor 8, a discharge port of a stirring device of the powder drying and dewatering device 1 is connected to a feed port of the powder weightlessness scale 7, a discharge port of the powder weightlessness scale 7 is connected to a feed port of the powder metering conveyor 8, and a discharge port of the powder metering conveyor 8 is connected to a front end inlet 6-1 of the continuous spiral mixing device. The powder material metering conveyor can adopt a single-screw or double-screw conveying device, and continuously conveys the powder material to the continuous spiral mixing device 6 in a continuous weightless metering mode.

Specifically, the dehydrated powder in the powder drying and dehydrating device 1 can be conveyed to the continuous spiral mixing device 6 through a gravity action pipeline, and the dehydrated powder can also be conveyed to the continuous spiral mixing device 6 through a pressing device.

For easy understanding, please refer to fig. 6, fig. 6 is a structural diagram of the quantitative powder-liquid pressing device and the booster pump provided in this embodiment, the continuous production line of the polyurethane coating in this embodiment further includes a quantitative powder-liquid pressing device 12, a discharge port of the stirring device of the powder-liquid mixing, drying and dehydrating device is connected to a feed port of the quantitative powder-liquid pressing device, and a discharge port of the quantitative powder-liquid pressing device is connected to a front end inlet 6-1 of the continuous spiral mixing device. The powder and liquid quantitative pressing device can be a double-station or multi-station volume quantitative metering supercharging device with servo control, and the powder and liquid is conveyed to the continuous spiral mixing device 6. The metering of the mixture of polyurethane coating powder and plasticizer with very poor flowability is achieved by this method.

Specifically, the dehydrated powder and liquid in the powder and liquid mixing, drying and dehydrating device 2 can be conveyed to the continuous spiral mixing device 6 through a gravity action pipeline, and the dehydrated powder and liquid can also be conveyed to the continuous spiral mixing device 6 through a material pressing device.

Further, the powder-liquid quantitative pressing device is further provided with a booster pump 11, the booster pump is used for conveying powder-liquid materials with very poor flowability output from the powder-liquid quantitative pressing device to the continuous spiral mixing device 6 more quickly, after the powder-liquid mixing, drying and dehydrating device 2 mixes and dehydrates the powder and the liquid to meet the process requirements, the powder-liquid materials are transferred to the powder-liquid quantitative pressing device (such as a double-station or multi-station pressing machine which can be a double-station or multi-station volume quantitative measurement pressurizing device with servo control) through a pump or a screw conveying device to be stored, and then the powder-liquid quantitative pressing device is utilized, and the powder-liquid materials are conveyed to the continuous spiral mixing device 6 through the powder-liquid quantitative pressing device. The metering of the mixture of polyurethane coating powder and plasticizer with very poor flowability is achieved by this method.

Specifically, the dehydrated liquid in the liquid material dehydration device 3 can be conveyed to the polymerization device 4 through a gravity action pipeline, or the dehydrated liquid can be conveyed to the polymerization device 4 through a pressing device. The polymerization apparatus 4 may employ a kneader, a mixer, or a reaction vessel.

For convenience of understanding, please refer to fig. 4, fig. 4 is a structural diagram of a liquid material dehydration device and a polymerization device provided in this embodiment, the continuous production line of the polyurethane coating in this embodiment further includes a liquid material metering and conveying device, the liquid material metering and conveying device includes a liquid material weightlessness metering tank and a liquid material metering and conveying pump 10, a discharge port of the polymerization device 4 is connected with a feed port of the liquid material weightlessness metering tank, and the liquid material weightlessness metering tank is connected with a middle end inlet 6-2 and a rear end inlet 6-3 of the continuous spiral mixing device through the liquid material metering and conveying pump 10. The polymerization apparatus may also be connected to a storage tank 9, the storage tank 9 being used to store the polymeric material and to convey the material according to the figure to the continuous screw mixing apparatus 6.

The liquid material conveying device 5 can be conventional liquid conveying equipment, and the liquid material conveying device 5 is used for conveying non-dehydrated liquid such as an auxiliary agent, a catalyst, an accelerant, a latent curing agent, a solvent oil and the like to the middle end inlet 6-2 and the rear end inlet 6-3 of the continuous spiral mixing device; the liquid material conveying device 5 can comprise a metering tank, a weightlessness scale, a liquid material metering pump and a liquid material conveying pump are arranged in the metering tank, the liquid material conveying pump can adopt a single-screw pump or a metering diaphragm pump, and liquid which is not dehydrated is continuously conveyed to the inlet 6-2 at the middle end and the inlet 6-3 at the rear end of the continuous spiral mixing device in a continuous weightlessness metering mode.

For convenience of understanding, please refer to fig. 7, fig. 7 is a structural diagram of a material pressing device and a color mixing device provided in this embodiment, specifically, the embodiment of the present application provides a material pressing device 13 and a color mixing device 14, the material pressing device 13 is an existing conventional device, the material pressing device 13 may be a double-station or multi-station pressing machine, and a pressure plate of the pressing machine is sealed by an O-ring or a V-ring to ensure that the material does not contact with air and form skin. The materials are pressed into the color mixing device through a pressing machine, the color mixing device 14 can be a 2K or 3K static mixer, the materials and the color paste are quantitatively conveyed into the static mixer in proportion through a quantitative system of the pressing machine, so that the materials are uniformly mixed in a color mixing way, and the process requirements are met; because polyurethane coating is thick liquid, need press the material to mix the colours with mixing of colors material in mixing of colors mixing arrangement through material press device, continuous spiral mixing arrangement 6's discharge gate and material press device's feed inlet are connected, and material press device's discharge gate and mixing of colors mixing arrangement's feed inlet are connected.

It should be noted that the continuous production line of the polyurethane coating in the embodiment of the present application may be manually controlled, or may be automatically controlled on line by setting up an existing conventional control device (for example, a DCS central control system or a PLC central control system), where the control device is connected to valves of a plurality of powder drying and dehydrating devices 1, a plurality of powder-liquid mixing and drying and dehydrating devices 2, a plurality of liquid-material dehydrating devices 3, a polymerization device 4, a plurality of liquid-material conveying devices 5, and a continuous spiral mixing device 6, so as to implement automatic continuous control of the polyurethane coating production system, setting of formulation parameters, monitoring of operation parameters, alarm of abnormal conditions, recording of operation data, and other functions.

The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A continuous production line for polyurethane paint, comprising: the device comprises a plurality of powder drying and dehydrating devices, a plurality of powder-liquid mixing and drying and dehydrating devices, a plurality of liquid material dehydrating devices, a polymerization device, a plurality of liquid material conveying devices and a continuous spiral mixing device;

2. The continuous production line of polyurethane paint as claimed in claim 1, wherein the powder drying and dewatering device comprises a stirring device, a filter, a cooler, a vacuum pump and a drying gas tank; the stirring device is provided with a powder inlet, an air inlet and a vacuumizing port; the filter is arranged on the vacuumizing port; the gas inlet of the cooler is connected with the vacuumizing port pipeline through the filter; a gas suction inlet of the vacuum pump is connected with a gas outlet pipeline of the cooler; and a gas outlet of the dry gas tank is connected with a gas inlet pipeline of the stirring device.

3. The continuous production line of polyurethane paint according to claim 2, characterized in that the liquid material dehydration device comprises a stirring device, a cooler, a vacuum pump and a drying gas tank; the stirring device is provided with a liquid material inlet, an air inlet and a vacuumizing port; the gas inlet of the cooler is connected with the vacuumizing port through a pipeline; a gas suction inlet of the vacuum pump is connected with a gas outlet pipeline of the cooler; and a gas outlet of the dry gas tank is connected with a gas inlet pipeline of the stirring device.

4. The continuous production line of polyurethane coating according to claim 3, characterized in that the continuous screw mixing device is a single screw mixer, a double screw mixer or a multi screw mixer.

5. The continuous production line of polyurethane paint as claimed in claim 4, wherein the water content of the powder material output by each powder material drying and dehydrating device is less than or equal to 0.05%, the water content of the powder liquid output by each powder liquid mixing, drying and dehydrating device is less than or equal to 0.05%, and the water content of the liquid material output by each liquid material dehydrating device is less than or equal to 0.05%.

6. The continuous production line of polyurethane paint as claimed in claim 5, wherein the stirring device of the powder drying and dehydrating device further comprises a temperature adjusting jacket, and the temperature adjusting jacket is sleeved on the outer wall of the stirring device of the powder drying and dehydrating device; the stirring device of the powder-liquid mixing, drying and dehydrating device further comprises a temperature adjusting jacket, and the temperature adjusting jacket is sleeved on the outer wall of the stirring device of the powder-liquid mixing, drying and dehydrating device; the stirring device of the liquid material dehydration device further comprises a temperature adjusting jacket, and the temperature adjusting jacket is sleeved on the outer wall of the stirring device of the liquid material dehydration device.

7. The continuous production line of polyurethane coating according to claim 1, further comprising a powder metering and conveying device, wherein the powder metering and conveying device comprises a powder weightlessness scale and a powder metering conveyor, a discharge port of a stirring device of the powder drying and dewatering device is connected with a feed port of the powder weightlessness scale, a discharge port of the powder weightlessness scale is connected with a feed port of the powder metering conveyor, and a discharge port of the powder metering conveyor is connected with a front end inlet of the continuous spiral mixing device.

8. The continuous production line of polyurethane coating of claim 1, further comprising a quantitative powder-liquid pressing device, wherein a discharge port of the stirring device of the powder-liquid mixing, drying and dehydrating device is connected with a feed port of the quantitative powder-liquid pressing device, and a discharge port of the quantitative powder-liquid pressing device is connected with a front inlet of the continuous spiral mixing device.

9. The continuous production line of polyurethane coating according to claim 1, further comprising a liquid material metering and conveying device, wherein the liquid material metering and conveying device comprises a liquid material weight loss metering tank and a liquid material metering and conveying pump, a discharge port of the polymerization device is connected with a feed port of the liquid material weight loss metering tank, and the liquid material weight loss metering tank is connected with a middle end inlet and a rear end inlet of the continuous spiral mixing device through the liquid material metering and conveying pump.

10. The continuous production line of polyurethane paint as claimed in claim 1, further comprising a material pressing device and a color mixing device; the discharge port of the continuous spiral mixing device is connected with the feed inlet of the material pressing device, and the discharge port of the material pressing device is connected with the feed inlet of the color mixing and mixing device.