Production device of waterborne polyurethane finish paint

Abstract

The utility model discloses a production device of waterborne polyurethane finish paint, which belongs to the technical field of coating processing and production, adopts full-closed continuous production and comprises a waterborne polyurethane preparation unit, an inlet of the waterborne polyurethane preparation unit is connected with a waterborne acrylic resin production unit, and an outlet of the waterborne polyurethane preparation unit is connected with a water-based acrylic resin production unit. An outlet of the waterborne polyurethane preparation unit is connected with a packaging unit; the waterborne polyurethane preparation unit comprises a first dispersion cylinder, and the waterborne acrylic resin production unit comprises a resin storage tank; in the production direction of the production device, the resin storage tank is located at the rearmost part of the water-based acrylic resin production unit, the first dispersion cylinder is located at the forefront part of the water-based polyurethane preparation unit, and the resin storage tank is directly connected with the first dispersion cylinder through a pipeline. According to the utility model, the water-based acrylic resin can be used immediately after being produced, so that the phenomenon of non-uniform particle size distribution caused by continuous reaction of residual monomers in the storage and transportation processes is avoided, the external influence is avoided in a full-closed manner, and the quality stability of the water-based polyurethane finish paint is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of paint processing and production, and particularly relates to a production device for water-based polyurethane finish. BACKGROUND

[0002] As an environmentally-friendly coating, water-based polyurethane finish has attracted much attention due to its unique properties and wide application fields. Water-based polyurethane finish is located at the outermost layer of the coating structure, and is required to not only play a protective role in protecting the substrate and intermediate coating from erosion, but also have good appearance effect and gloss. Therefore, as a key film-forming material, the water-based acrylic resin in the water-based polyurethane finish not only has strict requirements on its hydroxyl content and neutralization degree, but also has important factors affecting the performance of the water-based polyurethane finish, such as particle size and particle size distribution.

[0003] Most of the existing technologies use batch process to produce water-based acrylic resin, and the water-based acrylic resin is used for the production of water-based polyurethane finish after being stored and transported for different periods of time, which may have the following problems:

[0004] 1. In the batch production process, the reaction conditions are not easy to control, and the quality of different batches of products may differ. During storage and transportation, the residual monomers in the water-based acrylic resin continue to react, leading to the growth of latex particles and the generation of new latex particles, making the particle size distribution uneven.

[0005] 2. During storage and transportation, the water-based acrylic resin may be contaminated and affected by the external environment such as humidity and temperature, leading to mold growth and bacterial reproduction, which may reduce the quality of the water-based acrylic resin, thereby reducing the hardness, water resistance, and gloss of the water-based polyurethane finish, and causing a series of paint film problems, which may further reduce the service life of the finish.

[0006] In view of the above problems of the existing technology, the utility model combines years of design and use experience in the relevant field to design and manufacture a production device for water-based polyurethane finish to overcome the above defects. UTILITY MODEL CONTENTS

[0007] To solve the above problems, the utility model provides a production device for water-based polyurethane finish, which can produce water-based acrylic resin for immediate use, effectively improve production efficiency, improve the quality of water-based polyurethane finish, reduce manual intervention, and reduce production cost.

[0008] To achieve the above purpose, the utility model adopts the following technical solutions:

[0009] The application discloses a production device for water-based polyurethane finish, which comprises a water-based polyurethane preparation unit, wherein a water-based acrylic resin production unit is connected to an inlet of the water-based polyurethane preparation unit, and a packaging unit is connected to an outlet of the water-based polyurethane preparation unit.

[0010] The water-based polyurethane preparation unit comprises a first dispersion cylinder, and the water-based acrylic resin production unit comprises a resin storage tank.

[0011] In a production direction of the production device, the resin storage tank is a final unit in the water-based acrylic resin production unit, the first dispersion cylinder is an initial unit in the water-based polyurethane preparation unit, and the resin storage tank is directly connected to the first dispersion cylinder through a pipeline.

[0012] Preferably, the water-based acrylic resin production unit comprises a monomer batching tank and a preheater, the monomer batching tank is connected to the preheater through a metering pump, a discharge port of the preheater is connected to a continuous polymerization reactor, and a discharge port of the continuous polymerization reactor is connected to a cooler.

[0013] An initiator inlet is arranged on the continuous polymerization reactor, and the continuous polymerization reactor is one of a tubular reactor, a micro-channel reactor and an overflow kettle.

[0014] Preferably, the cooler is at least one stage of tubular heat exchanger.

[0015] Preferably, the water-based acrylic resin production unit further comprises a dispersion kettle, a feed inlet of the dispersion kettle is connected to a discharge outlet of the cooler, and the dispersion kettle is used for neutralizing and dispersing the water-based acrylic resin after cooling.

[0016] A discharge outlet of the dispersion kettle is connected to a first filter, and a discharge outlet of the first filter is connected to a feed inlet of the resin storage tank.

[0017] The first filter is used for filtering out colloidal particles and micelles with different particle sizes in the water-based acrylic resin.

[0018] Preferably, the first filter is an Amag filter and a first closed bag filter which are connected in sequence.

[0019] Preferably, the dispersion kettle is respectively provided with a reflux liquid inlet, a neutralizing agent inlet and a deionized water inlet, at least one stage of condenser is arranged on a top portion of the dispersion kettle, and a reflux liquid outlet of the condenser is connected to the reflux liquid inlet of the dispersion kettle.

[0020] Preferably, the dispersion kettle comprises a first dispersion kettle and a second dispersion kettle which are connected in parallel, and the water-based acrylic resin after cooling is alternately fed into the first dispersion kettle and the second dispersion kettle.

[0021] Preferably, the water-based polyurethane preparation unit further comprises a grinder, the feed inlet of the grinder is connected with the discharge outlet of the first dispersion cylinder, the discharge outlet of the grinder is connected with a second dispersion cylinder, and the discharge outlet of the second dispersion cylinder is connected with a second filter;

[0022] The first dispersion cylinder and the second dispersion cylinder are each provided with a closed cylinder cover, and the closed cylinder cover is provided with a closed hopper;

[0023] The first dispersion cylinder is used for dispersing materials including the filtered water-based acrylic resin, the leveling agent, the defoaming agent, the solid auxiliary agent and the pigment filler into a first dispersion liquid;

[0024] The second dispersion cylinder is used for receiving the ground first dispersion liquid and adjusting the color and the viscosity of the first dispersion liquid to obtain a water-based polyurethane finish;

[0025] The second filter is used for filtering out the colloidal particles and mechanical impurities of the water-based polyurethane finish;

[0026] The packaging unit comprises a packaging machine.

[0027] Preferably, the grinder is a horizontal closed grinder.

[0028] The second filter is a second closed bag filter.

[0029] The water-based polyurethane finish production device has the advantages that:

[0030] 1. The resin storage tank of the water-based acrylic resin production unit is directly connected with the first dispersion cylinder of the water-based polyurethane preparation unit through a pipeline, the water-based acrylic resin prepared from monomers directly enters the water-based polyurethane preparation unit to prepare a finish, the water-based acrylic resin is used immediately after production, the phenomenon of uneven particle size distribution caused by the residual monomers continuing to react during storage and transportation of the water-based acrylic resin is avoided, the uniformity of the particle size of the water-based acrylic resin is improved, the whole production device is continuously produced in a closed mode, the pollution of impurities such as air, moisture and dust to the product is effectively prevented, the volatilization and dispersion of harmful substances such as monomers, initiators, solvents and dust are avoided, and the quality stability of the water-based polyurethane finish is improved, and the pollution to the environment is reduced.

[0031] 2. The first dispersion kettle and the second dispersion kettle are connected in parallel to form a dispersion kettle, the water-based acrylic resin prepared by the water-based acrylic resin production unit can alternately enter the first dispersion kettle and the second dispersion kettle, continuous neutralization and dispersion of the water-based acrylic resin are realized, and the production cycle of the water-based polyurethane finish is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structural schematic view of a water-based polyurethane finish production device.

[0033] Figure 2 This is a schematic diagram of the structure of the device used in the disclosed embodiment of the present utility model.

[0034] In the figure: 1-monomer feed tank, 2-first metering pump, 3-preheater, 4-continuous polymerization reactor, 5-cooler, 6-dispersion kettle, 7-first filter, 8-resin storage tank, 9-second metering pump, 10-first dispersion tank, 11-grinder, 12-second dispersion tank, 13-second filter, 14-packaging machine, 15-waterborne acrylic resin production unit, 16-waterborne polyurethane preparation unit, 17-packaging unit, 61-first dispersion kettle, 62-second dispersion kettle. DETAILED DESCRIPTION

[0035] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0036] like Figure 1 、 Figure 2 As shown, a production device for waterborne polyurethane topcoat includes a waterborne polyurethane preparation unit 16. The inlet of the waterborne polyurethane preparation unit 16 is connected to a waterborne acrylic resin production unit 15, and the outlet of the waterborne polyurethane preparation unit 16 is connected to a packaging unit 17. The waterborne polyurethane preparation unit 16 includes a first dispersion tank 10, and the waterborne acrylic resin production unit 15 includes a resin storage tank 8. Along the production direction of the production device, that is, Figure 1 As indicated by the arrow, resin tank 8 is the final unit in waterborne acrylic resin production unit 15, and first dispersion tank 10 is the initial unit in waterborne polyurethane production unit 16. Resin tank 8 is directly connected to first dispersion tank 10 via a pipeline. Specifically, a metering pump 9 is provided on the pipeline between resin tank 8 and first dispersion tank 10, and waterborne acrylic resin is pumped into first dispersion tank 10 via metering pump 9.

[0037] The production device of the present utility model is a fully enclosed continuous production device. The water-based acrylic resin produced by the water-based acrylic resin production unit 15 enters the first dispersion tank 10 of the water-based polyurethane preparation unit 16 through a pipeline, so that the water-based acrylic resin, a film-forming substance, can be produced and used immediately. The uneven particle size distribution caused by the continued reaction of residual monomers in the water-based acrylic resin during storage and transportation is avoided, and the contamination of the product by the external environment is effectively prevented. The volatilization and escape of harmful substances such as monomers, initiators, solvents, and dust are avoided, thereby improving the quality stability of the water-based polyurethane topcoat and reducing pollution to the environment.

[0038] Specifically, the water-based acrylic resin production unit 15 comprises a monomer batching tank 1 and a preheater 3, and the discharge port of the monomer batching tank 1 is connected with the feed port of the preheater 3 through a first metering pump 2. Specifically, the monomer batching tank 1 is used for uniformly mixing monomers and solvents in a certain proportion, and the preheater 3 is used for receiving the materials in the monomer batching tank 1 and preheating.

[0039] In the utility model, the discharge port of the preheater 3 is connected with a continuous polymerization reactor 4, and the discharge port of the continuous polymerization reactor 4 is connected with a cooler 5. Specifically, the feed port of the continuous polymerization reactor 4 is connected with the discharge port of the preheater 3, and the discharge port of the continuous polymerization reactor 4 is connected with the feed port of the cooler 5.

[0040] In the production device, the continuous polymerization reactor 4 is provided with an initiator inlet, and the initiator is added into the continuous polymerization reactor 4 through the initiator inlet to initiate the polymerization reaction of monomers to obtain a polymerization reaction liquid containing water-based acrylic resin. In order to improve the polymerization effect, the continuous polymerization reactor 4 can be a single reactor or a reactor connected in multiple stages. As a preferred scheme, the continuous polymerization reactor 4 is a single reactor or a reactor connected in three stages in series. When the continuous polymerization reactor 4 is a single reactor, the feed port of the continuous polymerization reactor 4 is the feed port of the reactor, and the discharge port of the continuous polymerization reactor 4 is the discharge port of the reactor. When the continuous polymerization reactor 4 is a reactor connected in three stages in series, the feed port of the continuous polymerization reactor 4 is the feed port of the first-stage reactor, and the discharge port of the continuous polymerization reactor 4 is the discharge port of the third-stage reactor.

[0041] The continuous polymerization reactor 4 is preferably one of a tubular reactor, a micro-channel reactor or an overflow kettle.

[0042] Specifically, the tubular reactor is provided with a reaction chamber and a heat exchange chamber, and a stirring shaft is arranged in the reaction chamber, and a stirring paddle or a stirring fin is arranged on the stirring shaft. The material is stirred and mixed to ensure that the polymerization reaction can be stably carried out. The effective liquid holding capacity in the reaction chamber is 1-200 L. The heat exchange chamber exchanges heat with the reaction chamber through a flow-through heat exchange medium to ensure the polymerization reaction temperature. The heat exchange medium is not specifically limited, and the purpose is to reach the required temperature of the polymerization reaction.

[0043] In the utility model, the micro-channel reactor is a reinforced mixing channel structure, and the channel equivalent diameter is preferably 0.5-10 mm, which has a strong heat exchange function and can improve the polymerization effect.

[0044] In the utility model, the overflow kettle is composed of a stirrer, a kettle body, a jacket, a manhole, a shaft seal, a transmission device and a support, etc. The stirrer is preferably a propeller type, a turbine type or a paddle type. The overflow kettle exchanges heat through the jacket. The material flows in and out continuously. The material is immediately diluted after entering the overflow kettle, so that the concentration of the reactants is reduced, the rapid polymerization of monomers is avoided, and the uniformity of resin particle size is improved.

[0045] The polymerization reaction liquid obtained after the continuous polymerization reactor 4 polymerization is cooled by the cooler 5 to avoid a series of adverse chemical reactions such as degradation, branching or crosslinking degree increase of the water-based acrylic resin caused by neutralization of the polymerization reaction liquid at high temperature, reduce the influence of side reactions on the performance of the water-based acrylic resin, and ensure that the subsequent reaction is carried out within a safe temperature range to avoid safety accidents. In order to improve the cooling effect, the cooler 5 in the utility model is preferably at least one stage of a tubular heat exchanger, and is further preferably two stages of tubular heat exchangers connected in series.

[0046] Specifically, the tubular heat exchanger is provided with a tube pass and a shell pass, the polymerization reaction liquid flows in the tube pass, and the heat exchange medium flows in the shell pass to exchange heat with the polymerization reaction liquid in the tube pass.

[0047] The water-based acrylic resin production unit 15 further comprises a dispersion kettle 6 and a first filter 7 connected in sequence, the feed inlet of the dispersion kettle 6 is connected with the discharge outlet of the above-mentioned cooler 5, the discharge outlet of the dispersion kettle 6 is connected with the feed inlet of the first filter 7, and the discharge outlet of the first filter 7 is connected with the feed inlet of the above-mentioned resin storage tank 8.

[0048] Specifically, the dispersion kettle 6 is used for neutralizing and dispersing the water-based acrylic resin received from the cooler 5, and the dispersion kettle 6 is provided with a neutralizing agent inlet and a deionized water inlet. In order to avoid excessive volatilization of the neutralizing agent, solvent and deionized water and the like to affect the neutralization and dispersion of the water-based acrylic resin, and further affect the quality of the water-based acrylic resin, the top end of the dispersion kettle 6 in the utility model is preferably provided with at least one stage of a condenser, the dispersion kettle 6 is provided with a reflux liquid inlet, and the reflux liquid outlet of the condenser is connected with the reflux liquid inlet of the dispersion kettle 6. Further preferably, the top end of the dispersion kettle 6 is provided with two stages of condensers connected in series, the volatilized neutralizing agent, solvent and water in the neutralization and dispersion process are recovered through the two stages of condensers on the dispersion kettle 6, and then returned to the dispersion kettle 6 through the reflux liquid inlet of the dispersion kettle 6 to continue to participate in the neutralization reaction, thereby ensuring the quality of the water-based acrylic resin. The condenser in the utility model is not limited, and only liquid condensation recovery is required.

[0049] In order to improve the production efficiency, realize continuous production, and shorten the production cycle, as one preferred technical solution of the utility model, the dispersion kettle 6 comprises a first dispersion kettle 61 and a second dispersion kettle 62 connected in parallel, and the material in the cooler 5 is alternately fed into the first dispersion kettle 61 and the second dispersion kettle 62 through a feed pump.

[0050] The large size of the glue particles or the glue group produced in the polymerization reaction stage and the process of neutralizing dispersion is used for the production of the water-based acrylic resin, which can affect the performance and gloss of the finish. In order to ensure the quality of the water-based acrylic resin to be stable and reliable, and improve the quality of the water-based polyurethane coating, the first filter 7 is used to filter out the glue particles and the glue group with different particle sizes in the water-based acrylic resin. Further preferably, the first filter 7 is an Amag filter and a first closed bag filter connected in sequence. More preferably, the filter screen aperture of the Amag filter is preferably 200-300 mesh, and the filter bag aperture of the closed bag filter is preferably 0.1-0.5 μm.

[0051] In the utility model, the polymerization reaction liquid after neutralization and dispersion is put into the Amag filter and the closed bag filter connected in sequence, and the glue particles and the glue group with different particle sizes in the water-based acrylic resin are filtered out in sequence through two-stage filtration, which can not only improve the filtration efficiency, but also improve the filtration precision, ensure the purity and stability of the water-based acrylic resin, avoid the influence of the particle size difference of the water-based acrylic resin on the performance of the water-based polyurethane finish, and also avoid the equipment blockage, failure or shutdown caused by the glue group. The first filter 7 is a fully-closed operation, which can not only effectively prevent air, moisture, dust and other impurities from entering the water-based acrylic resin, ensure the stable quality of the water-based acrylic resin, but also prevent the water-based acrylic resin from volatilizing and oxidizing, further reduce the influence on the water-based polyurethane finish, and improve the application performance.

[0052] Specifically, the Amag filter is composed of a mixing kettle, a conveying pump and a closed filter, the closed filter is provided with a filter screen, and the filter screen is composed of a plurality of layers of stainless steel wire screens with different specifications and an annular semicircular pipe clamping the stainless steel wire screens. The polymerization reaction liquid after neutralization is fully mixed with the filter aid in the mixing kettle to obtain a mixed liquid, the mixed liquid is conveyed to the closed filter by the conveying pump, the filter aid with a large volume in the mixed liquid cannot penetrate the filter screen due to the small filter screen aperture, and a uniform filter aid filter layer is formed on the filter screen plate, and the water-based acrylic resin penetrates the filter screen and the filter aid filter layer to obtain a water-based acrylic resin crude product.

[0053] Specifically, the first closed bag filter is a pressure type filter device, and the water-based acrylic resin crude product from the Amag filter penetrates the filter bag with the required fineness grade after entering the filter bag of the first closed bag filter to obtain high-quality water-based acrylic resin, and the impurity particles are captured by the filter bag.

[0054] Specifically, the resin storage tank 8 is used as a temporary storage container for storing the water-based acrylic resin filtered by the first filter 7.

[0055] In the utility model, the monomer is one or more of styrene, methyl methacrylate, butyl acrylate, butyl methacrylate, hydroxyethyl acrylate, acrylic acid and isooctyl acrylate; the solvent is one or more of propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol butyl ether, ethylene glycol ethyl ether, ethylene glycol ethyl ether acetate, dimethylbenzene and butyl acetate; preferably, the initiator is one or more of di-tert-butyl peroxide, tert-butyl peroxyacetate, tert-butyl hydroperoxide and di-tert-butyl peroxydiisopropylbenzene; preferably, the neutralizing agent is one or more of N, N-dimethylethanolamine, triethylamine and ammonia.

[0056] Specifically, the water-based polyurethane preparation unit 16 further comprises a grinder 11, a second dispersion cylinder 12 and a second filter 13 connected in sequence. The discharge port of the first dispersion cylinder 10 is connected to the feed port of the grinder 11, the discharge port of the grinder 11 is connected to the feed port of the second dispersion cylinder 12, the discharge port of the second dispersion cylinder 12 is connected to the feed port of the second filter 13, and the discharge port of the second filter 13 is connected to the feed port of the packaging machine 14. The first dispersion cylinder 10 and the second dispersion cylinder 12 are both provided with a sealed cylinder cover, and the sealed cylinder cover is provided with a sealed hopper. The sealed cylinder cover and the sealed hopper can effectively prevent external pollutants from entering the first dispersion cylinder 10 and the second dispersion cylinder 12, thereby ensuring the purity of the material, improving the dispersion efficiency, preventing environmental pollution and ensuring the safety of operation. Specifically, the structure of the sealed cylinder cover and the sealed hopper is not limited, as long as the first dispersion cylinder 10 and the second dispersion cylinder 12 can be sealed.

[0057] In the utility model, the solid additives and the pigments and fillers are added into the first dispersion cylinder 10 through the sealed hopper on the first dispersion cylinder 10. The first dispersion cylinder 10 pre-disperses the material including the water-based acrylic resin, the leveling agent, the defoaming agent, the solid additives and the pigments and fillers into a first dispersion liquid, and then the first dispersion liquid is moved into the grinder 11 for grinding.

[0058] In the utility model, the grinder 11 is preferably a horizontal closed grinder. The horizontal closed grinder is a kind of high-efficiency, uniform and closed continuous production grinding equipment. The horizontal closed grinder is composed of a motor, a disperser grinding wheel, grinding media and a dynamic separator. The first dispersion liquid and the grinding media in the grinder 11 are stirred by the disperser grinding wheel. The solid particles in the first dispersion liquid and the grinding media produce more intense collision, friction and shearing action with each other, thereby accelerating the grinding of the fine particles and the dispersion of the aggregates. After the ground and dispersed material is separated from the grinding media by the dynamic separator, the material enters the second dispersion cylinder 12. Specifically, the second dispersion cylinder 12 adjusts the properties such as viscosity and color of the material, and obtains the water-based polyurethane finish.

[0059] In order to ensure the uniform quality of the waterborne polyurethane finish and ensure the coating performance, the second filter 13 is preferably a second closed bag filter. Further preferably, the pore size of the filter bag of the closed bag filter is 5-10 μm. The coating with adjusted viscosity, color and other properties by the second dispersion cylinder 12 enters the second filter 13 to filter colloidal particles, mechanical impurities and the like, so that the generation of defective products can be reduced, thereby reducing the production cost, and the amount of harmful substances generated in the preparation process of the coating can be reduced, the pollution to the environment is reduced, and the health and safety of the operators are ensured.

[0060] The packaging unit 17 comprises a packaging machine 14 which packages the waterborne polyurethane coating from the discharge port of the second filter 13 to finally obtain the packaged finished product of the waterborne polyurethane finish. The packaging machine 14 is a device well known to those skilled in the art, and will not be described here.

[0061] The utility model discloses a production process of monomer polymerization preparation waterborne acrylic resin is linked with application process, realizes waterborne acrylic resin's immediate use, avoided the influence that unstable factor caused to waterborne acrylic resin in storage and transportation process, improved waterborne polyurethane finish's quality stability. From the initial raw material monomer to the production process of waterborne polyurethane finish are all closed type continuous production, can effectively prevent air, moisture, dust and other impurities to the pollution of product, avoided the volatilization and dispersion of monomer, initiator, solvent, dust and other harmful substances, reduced the pollution to the environment.

[0062] In the utility model, unless another definite provision or limitation, the communication mode between each unit or device should do the broad sense understanding. For example, can be direct pipeline communication, also can be through the pipeline communication of communicating pump equipment, metering equipment, valve pipe fitting, intermediate tank and other conventional conveying, metering, control, temporary storage equipment, can be fixed communication, also can be detachable communication. For the person skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific situation.

[0063] In the utility model, each component of the production device, for example, tubular reactor, microchannel reactor, overflow kettle, tubular heat exchanger, Amag filter, closed bag filter, horizontal closed grinder, metering pump, storage tank, batching tank, preheater, dispersion kettle, dispersion cylinder, grinder, packaging machine and pipe fitting, valve, controller, feed pump and the like can be commercially available from the market, but the whole reaction device cannot be commercially available from the market, nor is it known to those skilled in the art.

[0064] Example 1

[0065] The embodiment provides a production device of waterborne polyurethane finish, and a structure schematic diagram is as shown in Figure 2The continuous polymerization reactor 4 is a first-stage tubular reactor, and an initiator inlet is arranged on the continuous polymerization reactor 4; the cooler 5 is a two-stage tubular heat exchanger connected in series; the dispersion kettle 6 is composed of a first dispersion kettle 61 and a second dispersion kettle 62 connected in parallel, and the first dispersion kettle 61 and the second dispersion kettle 62 are respectively provided with a reflux liquid inlet, a neutralizing agent inlet and a deionized water inlet, and the top ends of the first dispersion kettle 61 and the second dispersion kettle 62 are respectively provided with two-stage condensers; the first filter 7 is an Amagat filter and a first closed bag filter connected in series, the filter screen aperture of the Amagat filter is 300 meshes, and the filter bag aperture of the first closed bag filter is 0.5 μm; the first dispersion cylinder 10 and the second dispersion cylinder 12 are respectively provided with a closed cylinder cover and a closed hopper; the grinder 11 is a horizontal closed grinder; the second filter 13 is a second closed bag filter, and the filter bag aperture of the second closed bag filter is 10 μm.

[0066] The specific operation process is as follows:

[0067] The water-based acrylic resin production unit 15: the monomers and the solvent are mixed in the monomer batching tank 1 according to a certain proportion, and the uniformly mixed monomer solution is pumped into the preheater 2 by the first metering pump 2 for preheating;

[0068] The preheated monomer solution enters the continuous polymerization reactor 4 composed of a first-stage tubular reactor, and an initiator is added into the continuous polymerization reactor 4 through the initiator inlet. Under the action of the initiator, the monomers are polymerized to obtain a polymerization reaction liquid containing water-based acrylic resin, and the polymerization reaction liquid containing water-based acrylic resin enters the cooler 5, which is cooled by the two-stage tubular heat exchanger connected in series.

[0069] The cooled polymerization reaction liquid is pumped into the first dispersion kettle 61 by the feed pump, and the neutralizing agent and the deionized water are added into the first dispersion kettle 61 through the neutralizing agent inlet and the deionized water inlet, and the polymerization reaction liquid is neutralized and dispersed in the first dispersion kettle 61. During the neutralization and dispersion process, the two-stage condensers of the first dispersion kettle 61 condense and recover the neutralizing agent, the solvent and the water, and the recovered neutralizing agent, the solvent and the water are returned to the first dispersion kettle 61 through the reflux liquid inlet of the first dispersion kettle 61 to continue participating in the neutralization reaction. After the feeding of the first dispersion kettle 61 is completed, the feeding pipeline is switched to be communicated with the cooler 5 and the second dispersion kettle 62 through the valve, and the operation of the first dispersion kettle 61 is repeated. After the feeding of the second dispersion kettle 62 is completed, the feeding pipeline is switched to be communicated with the cooler 5 and the first dispersion kettle 61, and the first dispersion kettle 61 and the second dispersion kettle 62 are alternately fed. The polymerization reaction liquid after neutralization and dispersion is pumped into the first filter 7 composed of an Amagat filter and a first closed bag filter connected in series, and the polymerization reaction liquid is filtered in the two-stage filter to remove the larger colloidal particles and improve the quality of the water-based acrylic resin, and the filtered water-based acrylic resin is collected in the resin storage tank 8.

[0070] The water-based polyurethane preparation unit 16: the water-based acrylic resin in the resin storage tank 8 is directly pumped into the first dispersion cylinder 10 by the second metering pump 9, and deionized water, leveling agent, defoaming agent are added into the first dispersion cylinder 10, and then solid additives and pigments and fillers are added into the closed hopper of the first dispersion cylinder 10, and the first dispersion liquid is formed by pre-dispersing in the first dispersion cylinder 10, and the first dispersion liquid is transferred into the grinding machine 11 composed of a horizontal closed grinding mechanism for grinding, and after the fineness of the ground first dispersion liquid meets the index requirements, it is transferred to the second dispersion cylinder 12 for adjusting the viscosity, color and the like, and after the adjustment, the colloidal particles and mechanical impurities are filtered by the second filter machine 13 composed of a second closed bag type filter mechanism;

[0071] The packaging unit 17: the packaging machine 14 packages the material filtered by the second filter machine 13, and the packaged product of the water-based polyurethane finish is obtained.

[0072] It should be understood that the use of these embodiments is only for the purpose of illustrating the present application and is not intended to limit the protection scope of the present application. In addition, it should also be understood that after reading the technical content of the present application, those skilled in the art can make various modifications, modifications and / or variations to the present application, and all these equivalent forms also fall within the protection scope defined by the claims attached to the present application.

Claims

1. An apparatus for producing a waterborne polyurethane finish, characterized by comprising: The production device comprises a water-based polyurethane preparation unit, a water-based acrylic resin production unit connected to the inlet of the water-based polyurethane preparation unit, and a packaging unit connected to the outlet of the water-based polyurethane preparation unit. The water-based polyurethane preparation unit comprises a first dispersion cylinder, and the water-based acrylic resin production unit comprises a resin storage tank. In the production direction of the production device, the resin storage tank is the last unit in the water-based acrylic resin production unit, the first dispersion cylinder is the initial unit in the water-based polyurethane preparation unit, and the resin storage tank is directly connected to the first dispersion cylinder through a pipeline.

2. The apparatus for producing a waterborne polyurethane finish according to claim 1, characterized by The water-based acrylic resin production unit comprises a monomer batching tank and a preheater, the outlet of the monomer batching tank is connected to the inlet of the preheater through a metering pump, the outlet of the preheater is connected to a continuous polymerization reactor, and the outlet of the continuous polymerization reactor is connected to a cooler. The continuous polymerization reactor is provided with an initiator inlet, and is one of a tubular reactor, a micro-channel reactor, and an overflow kettle.

3. The apparatus for producing a waterborne polyurethane finish according to claim 2, characterized by The cooler is at least one stage of a tubular heat exchanger.

4. An apparatus for producing a waterborne polyurethane finish according to claim 2 or 3, characterized in that, The water-based acrylic resin production unit further comprises a dispersion kettle, the inlet of the dispersion kettle is connected to the outlet of the cooler, and the dispersion kettle is used for neutralizing and dispersing the water-based acrylic resin after cooling. The outlet of the dispersion kettle is connected to a first filter, and the outlet of the first filter is connected to the inlet of the resin storage tank. The first filter is used for filtering out colloidal particles and micelles of different particle sizes in the water-based acrylic resin.

5. The apparatus for producing a waterborne polyurethane topcoat according to claim 4, characterized by The first filter is an Amag filter and a first closed bag filter connected in sequence.

6. The apparatus for producing a waterborne polyurethane topcoat according to claim 4, wherein The dispersion kettle is respectively provided with a reflux liquid inlet, a neutralizing agent inlet, and a deionized water inlet, and at least one condenser is arranged on the top of the dispersion kettle, and the reflux liquid outlet of the condenser is connected to the reflux liquid inlet of the dispersion kettle.

7. The apparatus for producing a waterborne polyurethane topcoat according to claim 6, characterized by The dispersion kettle comprises a first dispersion kettle and a second dispersion kettle connected in parallel, and the water-based acrylic resin after cooling is alternately fed into the first dispersion kettle and the second dispersion kettle.

8. The apparatus for producing a waterborne polyurethane finish according to claim 1, wherein The water-based polyurethane preparation unit further comprises a grinder, the inlet of the grinder is connected to the outlet of the first dispersion cylinder, the outlet of the grinder is connected to a second dispersion cylinder, and the outlet of the second dispersion cylinder is connected to a second filter. The first dispersion cylinder and the second dispersion cylinder are respectively provided with a closed cylinder cover, and the closed cylinder cover is provided with a closed hopper. The first dispersion cylinder is used for dispersing materials including the filtered water-based acrylic resin, a leveling agent, a defoaming agent, a solid additive, and a pigment filler into a first dispersion liquid. The second dispersion cylinder is used for receiving the first dispersion liquid after grinding and adjusting the color and viscosity of the first dispersion liquid to obtain a water-based polyurethane topcoat. The second filter is used for filtering out colloidal particles and mechanical impurities in the water-based polyurethane topcoat. The packaging unit comprises a packaging machine.

9. The apparatus for producing a waterborne polyurethane topcoat according to claim 8, characterized by The grinder is a horizontal closed grinder. The second filter is a second closed bag filter.

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