CN211601496U - Expandable microsphere drying system - Google Patents
Expandable microsphere drying system Download PDFInfo
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- CN211601496U CN211601496U CN201921972013.XU CN201921972013U CN211601496U CN 211601496 U CN211601496 U CN 211601496U CN 201921972013 U CN201921972013 U CN 201921972013U CN 211601496 U CN211601496 U CN 211601496U
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Images
Abstract
The utility model provides an expandable microsphere drying system. The drying system includes: (1) a solid-liquid separation device; (2) drying device, drying device transversely includes in proper order: a feed section, a mixing section, an optional preheating section, a drying section, an optional cooling section, a discharge section, wherein the feed section, mixing section, optional preheating section, drying section, optional cooling section comprise a coaxial twin screw structure; the device comprises a drying device, a solid-liquid separation device, an auxiliary agent adding device, an auxiliary agent mixing device and a discharge collecting device, wherein the solid-liquid separation device is arranged at a feeding section of the drying device, (3) the auxiliary agent adding device is arranged at a mixing section of the drying device, and (4) the discharge collecting device is arranged at a discharge section of the drying device. The utility model discloses can realize the continuous drying of expandable microsphere, prevent effectively that expandable microsphere from bonding in drying process, improve drying system's use reliability and simplicity, effectively improve operating efficiency.
Description
Technical Field
The utility model relates to a chemical machinery field, concretely relates to expandable microsphere drying system.
Background
The microsphere is a thermal expandable thermoplastic polymer hollow sphere which contains a thermal expandable foaming agent, under the condition of heating, a polymer shell is softened, and the foaming agent is gasified to expand the microsphere. The preparation of various microspheres and the properties and uses of the microspheres are described in detail in many patents (e.g., CN104379647A), and are not described in detail herein. Kuaisui technology (Shanghai) Inc. can provide microspheres with different expansion temperatures, and the form mainly includes dry powder and wet cake. The solids content of the wet cake is typically 15% to 90%.
Expandable microspheres are required in many important applications to remove moisture and to be used in a dry, free-flowing form as an additive or filler. The density of the expandable microspheres before expansion is typically about 1.1g/cm3The density after foaming was reduced to 0.06g/cm3Can be used as light filler to be filled in solvent paint, printing ink, coating and various thermosetting plastics (such as sealing rings, insulating pipelines, putty compounds, paper, fabrics, synthetic foams, artificial marbles, polymer concrete and synthetic cement). Thus, the preparation of dry, free-flowing, unfoamed expandable microspheres is of great market value.
Many prior art methods disclose drying expandable microspheres, but few methods are currently available for directly preparing dried expandable microspheres from a slurry.
CN102633936A discloses a method for preparing dry expandable microspheres by spray drying. However, this method requires a high drying temperature, is disadvantageous for drying expandable microspheres, particularly low-temperature expanded microspheres, and easily causes expansion of the microspheres during drying. In addition, spray drying has the disadvantages of high energy consumption, high cost, product loss, serious environmental dust and the like. Therefore, the above method for drying microspheres is still to be further improved.
EP0348372 discloses a process for drying expandable microspheres, the drying taking place on a conveyor belt, which works well but with high heat transfer losses, long drying times, low efficiency, large equipment footprint and severe product caking.
Therefore, there is a need for a novel expandable microsphere drying system and a method for drying using the same that overcomes the above-mentioned disadvantages.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides an expandable microsphere drying system, which can dry expandable microspheres and can effectively prevent the expandable microspheres from bonding in the drying process.
The present inventors have understood the main cause of agglomeration of the wet cake of microspheres in the drying process through intensive studies and have found that, during the drying operation of expandable microspheres, mixing the wet cake of microspheres with a processing aid (e.g., a dispersant) under high shear uniformly ensures complete separation of microspheres before drying to reduce agglomeration.
To achieve the above object, according to one aspect of the present invention, there is provided an expandable microsphere drying system, comprising:
(1) a solid-liquid separation device;
(2) drying device, drying device transversely includes in proper order: a feeding section, a mixing section, an optional preheating section, a drying section, an optional cooling section and a discharging section,
wherein the feed section, mixing section, optional preheating section, drying section, optional cooling section comprise a coaxial twin screw configuration;
the solid-liquid separation device is arranged in a feeding section of the drying device, and the interior of the solid-liquid separation device is communicated with the interior of the feeding section;
(3) the auxiliary agent adding device is arranged in the mixing section of the drying device, and the interior of the auxiliary agent adding device is communicated with the interior of the mixing section;
(4) the discharging and collecting device is arranged at the discharging section of the drying device, and the interior of the discharging and collecting device is communicated with the interior of the discharging section.
In one embodiment, the solid-liquid separation device comprises:
the outer wall of the conical feeding hopper is provided with one or more one-way water outlets communicated with the interior of the conical feeding hopper;
the dehydration screw is arranged inside the conical charging hopper; and
the motor is driven.
In one embodiment, in the solid-liquid separation device, the conical hopper comprises a conical section and a cylindrical section, and the drain port is disposed on the cylindrical section.
In one embodiment, in the drying apparatus,
the feed section comprises a first twin-screw configuration,
the mixing section includes a second double screw configuration,
each of the optional preheating section, drying section, and optional cooling section comprises a third twin screw structure, wherein the third twin screw structure comprised by each of the optional preheating section, drying section, and optional cooling section is the same or different.
In one embodiment, in the drying apparatus, the first twin-screw structure, the second twin-screw structure and the third twin-screw structure are different from each other.
In one embodiment, the interior of the feed section, mixing section, optional preheating section, drying section, optional cooling section, and discharge section are in communication in the drying apparatus.
In one embodiment, the drying apparatus further comprises a barrel, the coaxial twin screw structure being disposed inside the barrel.
In one embodiment, the drying apparatus further comprises an exhaust port disposed in one or more of the mixing section, the preheating section, the drying section, the cooling section.
In one embodiment, the drying system further comprises a lateral coupling disposed at the feed section of the drying device and fixedly connected to the twin-screw body of the twin-screw structure.
In one embodiment, the drying system further comprises a frame, wherein the drying device is disposed on the frame.
The utility model discloses a drying system uses screw rod solid-liquid separation equipment and twin-screw drying device's series connection mode, has realized making the dry continuous drying of becoming powder of microballon thick liquids betterly. By controlling the temperature during drying, expandable microspheres with different water contents can be obtained, and even the expansion of the expandable microspheres can be realized.
Furthermore, the utility model discloses a specific screw rod solid-liquid separation equipment can realize the solid-liquid separation of thick liquids, blocks up when having solved the raw materials unloading simultaneously and mobility subalternation problem, can be the not good material of bonding dispersion continuous, even, stably feeding drying device.
Furthermore, the utility model discloses a specific twin-screw drying device, wherein the twin-screw structure can make processing aid (like liquid dispersant) and microballon wet cake misce bene, obtains the microballon wet powder that hardly bonds. The circumference of the double-screw preheating section and the circumference of the drying section are provided with a plurality of obliquely arranged spiral rib strips which are mutually meshed by two screws, so that the materials can be efficiently and uniformly heated, the materials can be better dehydrated, and the produced products are not easy to bond.
The utility model provides high drying system's use reliability and simplicity have effectively improved operating efficiency, and be convenient for processing, with low costs, are favorable to realizing mass production.
Compared with the prior art, the utility model discloses a method passes through solid-liquid separation equipment with expandable microsphere thick liquids and dewaters, and the microsphere wet cake that obtains mixes with processing aid (like liquid dispersant), then removes water through continuous mixing drying under the screw rod shearing action to preparation dry expandable microsphere powder.
The method has continuous operation and high production rate, can effectively prevent the agglomeration and surface bonding of the expandable microspheres, realizes the continuous drying of the expandable microspheres, can effectively prevent the bonding of the expandable microspheres in the drying process, improves the production efficiency, and simultaneously achieves the purposes of energy conservation and environmental protection.
Drawings
Fig. 1 is a schematic view of an expandable microsphere drying system according to one embodiment of the present invention.
Fig. 2 is a schematic view of a solid-liquid separation device according to an embodiment of the present invention.
Fig. 3 is a schematic view of a drying apparatus according to an embodiment of the present invention.
FIG. 4 is a microscopic view of the dry powder of microspheres of example 1.
Reference numerals
100: solid-liquid separation device
101: conical charging hopper
102: water outlet
103: dehydration screw
104: driving motor
200: drying device
201: barrel
202: exhaust port
203: double-screw structure
210: a feeding section
220: mixing section
230: preheating section
240: drying section
250: cooling section
260: discharging section
300: auxiliary agent adding device
400: discharged material collecting device
500: transverse coupling
600: rack
700: main motor
800: reduction gearbox
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
1. Expandable microsphere drying system
In one embodiment of the present invention, as shown in fig. 1, an expandable microsphere drying system comprises:
(1) a solid-liquid separation apparatus 100;
(2) a drying device 200 comprising, in order in a transverse direction: a feed section 210, a mixing section 220, an optional pre-heat section 230, a drying section 240, an optional cooling section 250, a discharge section 260,
wherein the feed section 210, mixing section 220, optional preheat section 230, drying section 240, optional cool section 250 comprise a coaxial twin screw configuration 203;
wherein the solid-liquid separation device 100 is arranged in the feeding section 210 of the drying device 200, and the interior of the solid-liquid separation device 100 is communicated with the interior of the feeding section 210;
(3) the auxiliary agent adding device 300 is arranged in the mixing section 220 of the drying device 200, and the inside of the auxiliary agent adding device 300 is communicated with the inside of the mixing section 220;
(4) and the discharged material collecting device 400 is fixedly arranged on the discharged material section 260 of the drying device 200, and the inside of the discharged material collecting device 400 is communicated with the inside of the discharged material section 260.
1.1 solid-liquid separation device
In one embodiment, the solid-liquid separation device 200 comprises:
a conical hopper 101, wherein one or more one-way water outlets 102 communicated with the interior of the conical hopper are formed in the outer wall of the conical hopper 101;
a dewatering screw 103 disposed inside the conical hopper 101; and
and the driving motor 104 is arranged at the top of the conical hopper 101, and the driving motor 104 is arranged at the top of the conical hopper 101.
Specifically, a dewatering screw 103 is provided on the central axis of the conical hopper 101, and the dewatering screw 103 is rotated by the driving of a driving motor 104.
In one embodiment, the conical hopper 102 comprises a conical section and a cylindrical section, and the drain 204 is disposed on the cylindrical section.
The solid-liquid separation device completes quantitative dehydration of the slurry through the solid-liquid separation effect of the dehydration screw 103, and generates a microsphere wet cake.
The drainage port 204 may be a circular opening made of metal and having a filter screen, and is used for discharging the filtrate generated by separating the microsphere slurry.
1.2 drying plant
In one embodiment, in the drying apparatus 200,
the feed section 210 comprises a first twin screw configuration,
the mixing section 220 comprises a second double screw configuration,
each of the optional preheating section 230, drying section 240, and optional cooling section 250 comprises a third twin screw structure, wherein the third twin screw structures comprised by each of the optional preheating section 230, drying section 240, and optional cooling section 250 can be the same or different.
In the third twin-screw structure, the length to diameter ratio of the body of the twin-screw structure 203 can be from 24 to 36.
Further, the first twin-screw structure may be a structure with a metal screw for transporting the wet cake of microspheres fed from the solid-liquid separation device 100;
the second double-screw structure can be a double screw made of metal and is used for mixing with the auxiliary agent added by the auxiliary agent adding device 300 and continuously conveying and mixing wet powder to a third double screw,
the third double-screw structure can be a double screw made of metal, and according to the conventional control principle of the double screws, the temperatures of the double screws are respectively controlled at different parts, so that the preheating, drying and cooling effects are realized, and the third double-screw structure is used for outputting dried microsphere powder. The twin screw body of the third twin screw structure can have a length to diameter ratio of 30 to 36.
In one embodiment, the first, second and third twin-screw structures may be different from each other.
In one embodiment, the interior of the feed section 210, mixing section 220, optional preheating section 230, drying section 240, optional cooling section 250, discharge section 260 are in communication in the drying apparatus 200. The mixing section 220 is used for mixing the microsphere wet cake with a processing aid to form microsphere wet powder; the preheating section 230 is used for starting to heat up so that the processing aid is coated on the surface of the microsphere; the drying section 240 is used for drying the uniformly mixed wet microsphere powder; the cooling section 250 is used for cooling the dried microspheres and further conveying the microspheres to the discharging section 260.
In one embodiment, the discharge section 260 may be a hollow cylinder structure for dry-powdering the microspheres from the cooling section 250. To the outfeed collection device 400.
In one embodiment, the drying apparatus 200 further comprises a barrel 201, the coaxial twin-screw structure 203 being disposed inside the barrel 201. The barrel 201 may be a metallic barrel structure for forming a continuous shell outside the twin screw.
In one embodiment, the circumferential surface of the twin-screw structure 203 is provided with a plurality of obliquely arranged spiral rib strips which are mutually meshed by two screws; the included angle formed by the spiral rib strips and the axial lead of the double-screw body is 19-20 degrees when the spiral rib strips are unfolded. If the included angle is too large, it may result in too fast a speed of transporting the wet cake of expandable microspheres, resulting in insufficient drying of the expandable microspheres. If the included angle is too small, it will result in too slow a speed of conveying the wet cake of expandable microspheres, resulting in too long a residence time of the expandable microspheres in the screw, and too much heating, causing the expandable microspheres to bind.
In one embodiment, the drying apparatus 200 further comprises an exhaust port 202, and the exhaust port 202 may be disposed in one or more of the mixing section 220, the preheating section 230, the drying section 240, and the cooling section 250. The exhaust port 202 may be a circular opening made of metal. By performing the exhaust using the exhaust port 202, the drying efficiency can be improved.
1.3 auxiliary agent adding device
In one embodiment, an additive adding device 300 is arranged in the mixing section, the additive adding device 300 can be an additive hopper, and a coupling for increasing the feeding speed can be arranged in the additive hopper. The additive hopper is used for adding processing additives.
The processing aid may be a dispersant. The addition of the processing aid can prevent the expandable microspheres from agglomerating in a later drying stage. The processing aid can be solid or liquid.
In one embodiment, the processing aid is a solid article. The solid product may use talc, calcium carbonate, barium sulfate, alumina, particularly alumina trihydrate, silica, titanium dioxide, zinc oxide, or the like. Other materials include spherical or hollow beads of ceramic, quartz or glass, fibrous materials. The fiber material includes glass fiber, cotton linter, carbon fiber and graphite fiber. Silica is preferably used as the solid article.
In another embodiment, the processing aid may be a liquid preparation, and castor oil, silicone oil, tween 60, liquid paraffin, silane coupling agents, polyethylene glycol, dioctyl phthalate, AMP-95 of dow chemical, and the like may be used. Preferably, dioctyl phthalate is used as the liquid product.
The utility model discloses in, the preferred liquid processing aid that uses, this is that liquid processing aid normal atmospheric temperature operation just can realize the parcel to the microballon, need control drying temperature to make its adhesion on the microballon surface unlike solid processing aid, easy operation, the quantity is few.
1.4 discharged material collecting device
In one embodiment, the discharge collection device 400 is a freely detachable container, which may be made of plastic or metal, and the discharge collection device 400 is flanged to the discharge section 260.
1.5 transverse coupling
In one embodiment, the drying system further comprises a cross coupling 500, the cross coupling 500 being disposed at the feed section of the drying apparatus 200 and being fixedly coupled to the twin screw body of the twin screw structure 203. The transverse coupler 500 is used for connecting the two twin screws through a reduction gear to drive the twin screws to rotate.
1.6 other devices
In one embodiment, the drying system further comprises a frame 600, wherein the drying device 200 is disposed on the frame 600. The drying system may further include a main motor 700 and a reduction gearbox 800, and the main motor 700 and the reduction gearbox 800 are disposed on the frame 600. The reduction gearbox 800 can control the rotation speed of the main motor 700, and the rotation speed of the transverse coupling 500 can be conveniently adjusted by matching the main motor and the transverse motor.
In one embodiment, the connection between the drying device 200 and the solid-liquid separation device 100, the connection between the drying device 200 and the additive adding device 300, and the connection between the drying device 200 and the discharged material collecting device 400 may be vertical connections, preferably vertical fixed connections. Further, the connection is a sealed connection.
2. Method for drying expandable microspheres
The method for continuously drying expandable microspheres of the present invention will be described in detail below.
According to an embodiment of the present invention, there is provided a method for drying expandable microspheres using the above-mentioned drying system, the method comprising the steps of:
and (3) dehydrating: adding microsphere slurry synthesized by suspension polymerization into the solid-liquid separation device, dehydrating the microsphere slurry to form a microsphere wet cake, and conveying the microsphere wet cake to a feeding section of the drying device;
mixing: conveying the microsphere wet cake from the feeding section to the mixing section, and simultaneously adding a processing aid to the mixing section through the aid adding device, so that the microsphere wet cake and the processing aid are mixed to form microsphere wet powder;
and (3) drying: and conveying the wet microsphere powder from the mixing section to the drying section, and drying the wet microsphere powder in the drying section to obtain dry microsphere powder.
2.1 dehydration step
In one embodiment, in the dewatering step, the microsphere slurry is dewatered to form a microsphere wet cake by adjusting the rotational speed of the dewatering screw 103.
In one embodiment, in the dewatering step, the rotation speed of the paddles in the conical hopper 101 of the solid-liquid separation device is in the range of 30 to 90 rpm. If the rotating speed is too high, the microsphere slurry can splash everywhere, so that the feeding of the microsphere slurry is insufficient, and the dehydration efficiency is reduced; if the rotating speed is too low, the microsphere slurry is not uniform up and down, and the obtained wet powder content of the microspheres is uncertain, so that the addition amount of the processing aid of the aid adding device 300 cannot be calculated.
In one embodiment, in the dewatering step, the rotational speed of the lateral coupling 500 may be 2 to 100rpm, preferably 10 to 80rpm, and more preferably 30 to 60rpm, in order to obtain a determined amount of wet micro-spherical powder for entering the feeding section. This is matched to the speed of the paddles in the conical hopper 101 of the solid-liquid separation device 100. If the rotating speed is too high, the expandable microspheres are subjected to large shearing and extrusion, and then the expandable microspheres wet cake is bonded; if the rotation speed is too low, insufficient dewatering of the slurry of expandable microspheres may result.
In one embodiment, the screw speed of the screw in the conical hopper 101 of the solid-liquid separation device 100 can be 200-. If the rotating speed is too high, the feeding speed of the expandable microspheres is too high, and the drying degree of the expandable microspheres is insufficient; if the rotation speed is too low, it will result in too slow a speed of conveying the expandable microspheres, causing the expandable microspheres to heat too much, which in turn causes the expandable microspheres to foam.
In one embodiment, the feed rate of the microsphere slurry in the dewatering step is 300-. In particular, the feed rate of the solid-liquid separation device can be adjusted to match the transport rate of the feed section.
2.2 mixing step
In one embodiment, in the mixing step, the wet powder of microspheres has a solid content of 60% to 75%.
In one embodiment, in the mixing step, the rotation speed of the lateral coupling 500 may be set according to actual operating conditions. If the rotating speed is too high, the mixing speed of the wet microsphere powder and the processing aid is too high, and further, the mixing of the microspheres and the processing aid is too little, so that the processing aid mixed on the surfaces of the microspheres is insufficient; if the rotation speed is too low, the speed of conveying the wet powder of microspheres is too slow, and further the processing aid mixed in the wet powder of microspheres is not uniform, causing the microspheres to be bonded when dried.
In the mixing step, the processing aid is mixed with the microspheres to prevent the microspheres from being adhered in the drying process, so that the agglomeration is generated. In addition, the processing aid also contributes to uniform heating of wet powder, and the probability of the microspheres expanding when being heated is greatly reduced when the screw rod in the machine barrel is sheared.
In one embodiment, in the mixing step, the processing aid is a liquid processing aid, such as a liquid dispersant. The utility model discloses an add processing aid and prevent that the microballon from caking in the following drying step.
2.3 drying step
In one embodiment, in the drying step, the wet microsphere powder is transported from the mixing section to the pre-heating section, pre-heated, and then transported to the drying section.
In one embodiment, the temperature of the feeding section, the mixing section and the cooling section is room temperature, and the temperature of the preheating section is lower than that of the drying section.
The temperature of the preheating section and the drying section is adapted to the expansion temperature of the raw material microspheres, and the too low temperature can cause insufficient heating of the microspheres and insufficient processing aids for adhesion of the surfaces of the microspheres; too high a temperature may result in the microspheres being heated too much, causing the microspheres to expand as a result of foaming.
The temperature of the preheating section and the drying section is higher than that of the expandable microspheres in order to prevent the expandable microspheres from foaming during the drying processInitial foaming temperature T of thermally expandable microspheresstartLow. In principle, the temperature of the drying section is compared with the T of the microspheresstartThe lower temperature is 4-5 ℃.
For low temperature microspheres, the temperature of the preheating section may be from 30 to 90 ℃, preferably from 50 to 90 ℃, more preferably from 70 to 90 ℃; the temperature in the drying section may be in the range 60 to 100 deg.C, preferably 80 to 100 deg.C, more preferably 90 to 100 deg.C. For high temperature microspheres, the temperature of the preheating section may be from 30 to 100 ℃, preferably from 50 to 100 ℃, more preferably from 80 to 100 ℃; the temperature of the drying section may be 60-145 deg.C, preferably 100-140 deg.C, more preferably 120-140 deg.C.
In one embodiment, in the drying step, the wet powder of microspheres mixed with a processing aid is heated to remove water. There is a vent 202 above the barrel of the drying section, and the water in the wet microsphere powder is heated to become water vapor and is discharged from the vent 202. The vent 202 includes a screen plate and a filter medium, thereby preventing microspheres from exiting the vent 202.
2.4 further steps
In one embodiment, the method further comprises, after the drying step:
conveying the dry powder from the drying section to a cooling section for cooling and conveying to a discharging section; and
and conveying the dry powder to the discharge collecting device from a discharge section.
Particularly, the dry powder enters the sealed discharging and collecting device which can be detached at any time through the discharging hole of the discharging section, so that the dust environmental pollution of the dry powder is reduced.
Examples
Hereinafter, the present invention will be described in detail with reference to examples to specifically describe the present invention. However, the embodiments of the present invention may be modified into various other forms and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more fully describe the invention to those of ordinary skill in the art.
The components in the following examples are commercially available from the general market or can be easily made by the user, unless otherwise specified.
Example 1
The method of this embodiment is implemented using the drying system shown in fig. 1, and comprises the steps of:
(1) firstly, a microsphere slurry (wherein the microspheres are low-temperature microspheres) which is synthesized by suspension polymerization and has a water content of 70 percent is added into a conical feeding hopper 101 of a solid-liquid separation device 100 (self-made, wherein the conical feeding hopper 101 is from Hongyu machinery limited company, and a dewatering screw 103 is from Bohai machinery limited company in Zhoushan), and the feeding speed is 300 kg/h.
In the solid-liquid separation device 100, a driving motor 104 drives a dewatering screw 103 to rotate, so as to realize solid-liquid separation of slurry, wherein liquid is discharged from a water outlet 102, the dewatering screw 103 pushes solid (microsphere wet cake) to a feeding section 210 of the drying device 200 (from Shanghai Baodish plastic equipment Co., Ltd., modified and connected with the solid-liquid separation device 100), and the rotating speed of the dewatering screw 103 is 230 rpm. The temperature of the feed section 210 is room temperature.
(2) Then, the wet microsphere cake is conveyed from the feeding section 210 to the mixing section 220 (at room temperature), and a processing aid (liquid dispersant polyvinyl alcohol (shanghai alading biochemical technology, ltd)) is added to the mixing section 220 through an aid adding device 300, wherein the addition amount is 1Kg/h, so that the wet microsphere cake and the processing aid are uniformly mixed to form wet microsphere powder.
Wherein the rotational speed of the cross coupling 500 (from taixin precision plastic machinery, ltd) connected to the drying apparatus 200 is 70 rpm.
(3) The wet microsphere powder is conveyed from the mixing section 220 to a preheating section 230 (at a temperature of 50 ℃), then conveyed to the drying section 240 (at a temperature of 70 ℃), and heated and dried in the drying section 240 to obtain dry microsphere powder.
The dry microsphere powder is a dry expandable microsphere powder with a density of 18 kg/cubic meter with little agglomeration.
(4) The dry microsphere powder is conveyed from the drying section 240 to the cooling section 250 (at room temperature) for cooling, conveyed to the discharging section 260 (at room temperature), and then enters the sealed discharging and collecting device 400 (plastic packaging barrel) through the discharging port of the discharging section 260.
Thus preferably the dry expandable microspheres are continuously prepared using the system described above.
Example 2
The drying system and process flow of example 2 are essentially the same as example 1, except for the following:
in the step (1), microsphere slurry (wherein the microspheres are low-temperature microspheres) synthesized by suspension polymerization and having a water content of 70% is added into a conical feeding hopper, the feeding speed is 350kg/h, and the rotating speed of the dewatering screw 103 is 300 rpm.
In the step (2), the processing aid from the aid adding device 300 is liquid dispersant polyvinylpyrrolidone (Shanghai Aladdin Biotechnology Co., Ltd.) with an addition of 1 Kg/h;
the rotational speed of the lateral coupling 500 connected to the drying apparatus 200 was 80 rpm.
In the step (3), the temperature of the preheating section is 90 ℃ and the temperature of the drying section is 100 ℃.
The dry microsphere powder obtained in step (3) is a dry expandable microsphere powder with a density of 21 kg/m and almost no binding.
Experimental example 1 Water content test of microspheres
100g of microspheres obtained by drying in examples 1-2 were weighed, and then placed in an oven (Canno, Guangzhou, pharmaceutical machinery, Inc.) at 50 ℃ to continue drying, and the mass was weighed once every hour until the mass of the microspheres in the beaker did not change. And (3) calculating the water content according to the following calculation formula:
M0Before placing in an ovenMass of microspheres
M1Mass of microspheres which no longer changes after being placed in an oven
The calculation results are shown in table 1 below.
From the above experimental results, it can be seen that the microsphere slurry with different water contents is dried in the above manner, and the water content of the dried microspheres is between 0.38% and 0.42%. This shows that the above drying system and method can obtain dried microspheres with extremely low water content.
Experimental example 2 microscopic Observation of microsphere Dry powder
The dry powder of microspheres obtained in example 1 was observed under a microscope.
1g of dry microsphere powder obtained by drying is taken out and put into a test tube, then 10mL of water is added into the test tube, and the dry microsphere powder is uniformly mixed by a rubber head dropper. Then, a drop of the above mixture was dropped onto a glass slide, uniformly coated with a glass rod, and observed under a microscope (Xiamen Mackeren Eleko Co., Ltd., DC130) at 40-fold magnification. The captured image is shown in fig. 4.
As can be seen from fig. 4, the microspheres after drying are uniformly dispersed, which indicates that the microspheres with good dispersibility can be obtained by the above-mentioned drying method.
The above description is only the preferred embodiment of the present invention. It should be noted that, for those skilled in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (10)
1. An expandable microsphere drying system, comprising:
a solid-liquid separation device;
drying device, drying device transversely includes in proper order: a feeding section, a mixing section, an optional preheating section, a drying section, an optional cooling section and a discharging section,
wherein the feed section, mixing section, optional preheating section, drying section, optional cooling section comprise a coaxial twin screw configuration;
the solid-liquid separation device is arranged in a feeding section of the drying device, and the interior of the solid-liquid separation device is communicated with the interior of the feeding section;
the auxiliary agent adding device is arranged in the mixing section of the drying device, and the interior of the auxiliary agent adding device is communicated with the interior of the mixing section;
the discharging and collecting device is arranged at the discharging section of the drying device, and the interior of the discharging and collecting device is communicated with the interior of the discharging section.
2. The expandable microsphere drying system of claim 1,
the solid-liquid separation device comprises:
the outer wall of the conical feeding hopper is provided with one or more one-way water outlets communicated with the interior of the conical feeding hopper;
the dehydration screw is arranged inside the conical charging hopper; and a drive motor.
3. The expandable microsphere drying system of claim 2,
in the solid-liquid separation device, the conical charging hopper comprises a conical section and a cylindrical section, and the water outlet is arranged on the cylindrical section.
4. The expandable microsphere drying system of claim 1,
in the drying apparatus, the drying apparatus is provided with a drying device,
the feed section comprises a first twin-screw configuration,
the mixing section includes a second double screw configuration,
each of the optional preheating section, drying section, and optional cooling section comprises a third twin screw structure, wherein the third twin screw structure comprised by each of the optional preheating section, drying section, and optional cooling section is the same or different.
5. The expandable microsphere drying system of claim 4,
in the drying device, the first twin-screw structure, the second twin-screw structure, and the third twin-screw structure are different from each other.
6. The expandable microsphere drying system of claim 1,
in the drying device, the insides of the feed section, the mixing section, the optional preheating section, the drying section, the optional cooling section and the discharge section are communicated.
7. The expandable microsphere drying system of claim 1,
the drying device further comprises a machine barrel, and the coaxial double-screw structure is arranged inside the machine barrel.
8. The expandable microsphere drying system of claim 1,
the drying device also comprises an air outlet which is arranged in one or more of the mixing section, the preheating section, the drying section and the cooling section.
9. The expandable microsphere drying system of claim 1,
the drying system further comprises a transverse coupler, and the transverse coupler is arranged at the feeding section of the drying device and is fixedly connected with the double-screw body of the double-screw structure.
10. The expandable microsphere drying system of claim 1,
the drying system further comprises a frame, wherein the drying device is arranged on the frame.
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Denomination of utility model: Expandable microsphere drying system Effective date of registration: 20231017 Granted publication date: 20200929 Pledgee: Silicon Valley Bank Co.,Ltd. Pledgor: Fast thinking technology (Shanghai) Co.,Ltd.|NANOSPHERE (SHANGHAI) Co.,Ltd. Registration number: Y2023310000625 |