CN110715538A - Expandable microsphere drying system and method - Google Patents
Expandable microsphere drying system and method Download PDFInfo
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- CN110715538A CN110715538A CN201911117019.3A CN201911117019A CN110715538A CN 110715538 A CN110715538 A CN 110715538A CN 201911117019 A CN201911117019 A CN 201911117019A CN 110715538 A CN110715538 A CN 110715538A
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
- F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
- F26B3/20—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source being a heated surface, e.g. a moving belt or conveyor
- F26B3/205—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source being a heated surface, e.g. a moving belt or conveyor the materials to be dried covering or being mixed with heated inert particles which may be recycled
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Manufacturing Of Micro-Capsules (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The present invention provides expandable microsphere drying systems and methods, the systems comprising: (1) a feeding device, (2) a drying device, wherein the drying device sequentially comprises the following components in the transverse direction: a feeding section; a dewatering section; drying the part; the drying part sequentially comprises a mixing section, an optional preheating section, a drying section and an optional cooling section in the transverse direction; the device comprises a feeding section, a dewatering section and a drying part, wherein the feeding section, the dewatering section and the drying part comprise coaxial double-screw structures; wherein the feeding device is arranged in the feeding section, and the interior of the feeding device is communicated with the interior of the feeding section; and (3) an auxiliary agent adding device, wherein the auxiliary agent adding device is arranged in the mixing section; (4) a discharge collection device disposed in the discharge section. The invention can realize continuous drying of the expandable microspheres, effectively prevent the microspheres from bonding in the drying process, improve the use reliability and simplicity of the drying system and effectively improve the operation efficiency.
Description
Technical Field
The invention belongs to the field of chemical machinery, and particularly relates to an expandable microsphere drying system and method.
Background
The expandable microsphere is a plastic particle synthesized by suspension polymerization and consists of an airtight shell and a foaming agent sealed in the airtight shell. When the microspheres are heated, they expand irreversibly, thereby producing expanded microspheres. Expandable microspheres are widely used as foaming materials in industrial fields, pharmaceuticals, lightweight fillers, and the like. When used to print inks, 3D textures can be created on wallpaper and textiles. In cardboard, the microspheres can be used as lightweight fillers, increasing the volume while improving the insulation properties. The automotive industry uses microspheres in underbody coatings, tires, composites, and adhesive degumming.
The microsphere synthesis and foaming technology is reported in patents such as CN 105396524A. Due to the difference of the synthesis process, the microspheres can be classified into low-temperature microspheres, high-temperature microspheres and ultra-high-temperature microspheres according to the expandable temperature range of the microspheres. Kuaisui technology (Shanghai) Inc. can provide microspheres in the form of dry powders and wet slurries with various expansion temperatures, increasing the diameter from 20 μm to 50-80 μm and density from 1100 kg. m when the microspheres expand with heat–3Down to about 20-30 kg-m–3。
Both unexpanded and expanded forms of expandable microspheres are commercially available, but because expanded microspheres are very light powders with low density, which are inconvenient to produce, transport and sell, users generally purchase more unexpanded microspheres, expand them on site or add them directly to the production process for continuous preparation of the final product.
The expandable microspheres polymerize and the particles are collected from the aqueous phase to give a wet cake in the wet cake state and further dried to form a free flowing dispersible powder. Since the temperature sensitivity of the spheres depends on the softening point of the polymer shell wall, high temperature evaporative drying cannot generally be used to remove water in a timely manner. Furthermore, since the aqueous slurry contains many contaminants and additives from the suspension polymerization process, it tends to aggregate and cake when dewatered to form a wet cake, resulting in failure to obtain unexpanded microspheres with good dispersibility upon final drying.
Many patents mention methods and apparatus for drying expanded microspheres. CN105150494A proposes an apparatus and a method for continuously preparing ultra-light filler, which well solves the problems of bridging, blocking and poor fluidity of raw materials during charging, wherein a double screw is used to realize the continuous preparation of dry powder ultra-light filler by wet cake. However, the above-mentioned patents refer to methods and apparatus for further drying of wet cake having a low water content, and obtaining wet cake from slurry generally requires a solid-liquid separation apparatus.
CN1093830663A mentions an apparatus for solid-liquid separation using twin screws, which can simplify the post-drying and at the same time make the drying more economical, since in most cases the screw filter press is able to remove as much liquid as possible. Because the screw rod is to the continuous stirring of material, the condition including to a great extent material is with moisture parcel for the dehydration is more thorough, but because the easy reunion problem that produces of powder filter-pressing, the reunion problem of this equipment when dry expandable microsphere thick liquids dewaters can not be solved.
CN106693416A mentions that a device composed of a spray drying tower, a vacuum dryer and an air flow drying system can be used to directly dry the slurry, but there are problems of high energy consumption of the spray drying equipment, easy generation of dust pollution, etc., and there is still a need for improvement.
Accordingly, there is a significant need for an expandable microsphere drying system and method that overcomes the above-mentioned disadvantages.
Disclosure of Invention
In order to overcome the above-mentioned disadvantages of the prior art, the present invention provides an expandable microsphere drying system and method, which can achieve continuous drying of expandable microspheres and effectively prevent the expandable microspheres from sticking to each other during the drying process.
To achieve the above object, according to one aspect of the present invention, there is provided an expandable microsphere drying system comprising:
(1) a feeding device, a feeding device and a feeding device,
(2) drying device, drying device transversely includes in proper order:
a feeding section, a discharging section and a feeding section,
in the dewatering section, the water is removed,
a drying section which comprises a mixing section, an optional preheating section, a drying section and an optional cooling section in sequence in the transverse direction,
a discharging section is arranged at the bottom of the feeding device,
wherein the feeding section, the dewatering section and the drying part comprise coaxial double-screw structures;
wherein the feeding device is arranged in the feeding section, and the interior of the feeding device is communicated with the interior of the feeding section; and
(3) the auxiliary agent adding device is arranged in the mixing section, and the interior of the auxiliary agent adding device is communicated with the interior of the mixing section;
(4) a discharge collection device disposed in the discharge section, just the interior of the discharge collection device is communicated with the interior of the discharge section.
According to another aspect of the present invention, there is provided a method for drying expandable microspheres using the expandable microsphere drying system described above, the method comprising the steps of:
feeding: adding microsphere slurry synthesized by suspension polymerization into the feeding device, and conveying the microsphere slurry to a feeding section of the drying device;
and (3) dehydrating: transporting the microsphere slurry from the feed section to the dewatering section, dewatering the microsphere slurry in the dewatering section, thereby obtaining a wet cake;
mixing: outputting the wet cake from the dewatering section to a mixing section of the drying part, and adding a processing aid to the mixing section of the drying part through the aid adding device to mix the wet cake and the processing aid to form wet powder;
and (3) drying: and conveying the wet powder from the mixing section of the drying part to the drying section of the drying part, and heating and drying the wet powder in the drying section to obtain dry powder.
The drying system realizes continuous low-temperature drying of the microspheres by a combined form of screw dehydration and screw drying and by adding the processing aid, can effectively prevent the microspheres from being bonded in the drying process, improves the production efficiency, and simultaneously achieves the purposes of energy conservation and environmental protection.
In addition, the invention can dry the expandable microspheres in different foaming temperature intervals and states by adopting a quantitative feeding device with spiral stirring and a continuous double-screw structure. 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.
In addition, the invention provides a method for directly and continuously drying slurry by using the device to obtain expandable microspheres by using the stirring and pushing actions of the screw in the series device of the dehydration section and the drying part for the first time, thereby greatly improving the drying efficiency of the microspheres.
The invention improves the use reliability and the simplicity of the drying system, effectively improves the operation efficiency, is convenient to process, has low cost and is beneficial to realizing batch production.
Compared with the prior art, the method disclosed by the invention well solves the problems that continuous operation cannot be realized during the drying of the microspheres, aggregation and agglomeration are generated during the drying, and the like. According to the invention, the microsphere slurry can be directly dried, and the continuous low-temperature drying of the microsphere slurry can be directly carried out, and the microsphere slurry directly becomes free-flowing microsphere dry powder through screw dehydration, mixing and drying without a separate dehydration to form a wet cake stage.
Drawings
FIG. 1 is a schematic illustration of an expandable microsphere drying system according to one embodiment of the present invention.
Fig. 2 is a schematic view of a drying apparatus according to an embodiment of the present invention.
Figure 3 is a schematic diagram of a dewatering section according to one embodiment of the present invention.
Fig. 4 is a schematic view of a dry station according to one embodiment of the present invention.
FIG. 5 is a microscopic view of the dry powder of microspheres of example 1.
Reference numerals
100: feeding device
200: drying device
201: barrel
202: exhaust port
210: a feeding section
211: first double screw
220: dewatering section
221: second double screw
222: water outlet
223: filter screen
230: dry part
231: third twin screw
232: fourth twin screw
230-1: mixing section
230-2: preheating section
230-3: drying section
230-4: cooling section
240: discharging section
300: auxiliary agent adding device
400: discharged material collecting device
500: transverse coupling
600: rack
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
1. Expandable microsphere drying system
In one embodiment of the present invention, as shown in fig. 1, there is provided an expandable microsphere drying system comprising:
(1) the feeding device (100) is provided with a feeding device,
(2) a drying device 200 comprising, in order in a transverse direction:
the feed section 210 is a section of the feed,
the dewatering section 220 is arranged such that,
a drying section 230 comprising in sequence in the transverse direction a mixing section 230-1, an optional preheating section 230-2, a drying section 230-3, an optional cooling section 230-4,
a discharge section 240 is provided at the discharge end,
wherein the feeding section 210, the dewatering section 220, and the drying section 230 comprise a coaxial twin-screw structure;
wherein the feeding device 100 is disposed in the feeding section 210, and the interior of the feeding device 100 is communicated with the interior of the feeding section 210; and
(3) the auxiliary agent adding device 300 is arranged in the mixing section 230-1, and the inside of the auxiliary agent adding device 300 is communicated with the inside of the mixing section 230-1;
(4) the discharged material collecting device 400 is arranged on the discharging section 230-4, and the interior of the discharged material collecting device 400 is communicated with the interior of the discharging section 230-4.
1.1 feeding device
In one embodiment, the feeding device 100 comprises a conical hopper, a motor is arranged on the top of the conical hopper, a conical propeller is arranged on the central shaft, and the circular radius of the conical propeller from top to bottom is reduced in sequence. Through the feeding device adopting spiral stirring, the problems of blockage, bridging and the like during raw material blanking are well solved, and materials which are not well dispersed can continuously, uniformly and stably enter the drying device.
In one embodiment, the connection of the feeding section 210 to the feeding device 100 may be a vertical connection, preferably a vertical fixed connection. The feeding section 210 may be a structure with a metal screw for conveying the slurry fed from the feeding device 100.
1.2 drying plant
In one embodiment, in the drying apparatus 200, the dewatering section 220 is a screw solid-liquid separation apparatus.
In one embodiment, in the drying apparatus 200, a screen 223 is present within the dewatering section 220. The mesh of the filter screen is set to be 50-100 meshes. If the filter screen is too large, the wet cake after the dehydration of the expandable microspheres can flow away with water, so that the expandable microspheres are lost; if the screen is too small, this can result in the wet cake from dewatering clogging the screen, which can result in the expandable microsphere slurry not being dewatered as quickly, causing the slurry to overflow from the feed port.
In one embodiment, in the drying apparatus 200, the dewatering section 220 includes a drain 222. The drain port 222 may be disposed below the dewatering section 220. The drain port 222 may be a circular opening made of metal and having a screen for discharging the filtrate generated from the slurry passing through the dewatering section 220.
In one embodiment, in the drying apparatus 200,
the feed section 210 comprises a first twin screw configuration,
the dewatering section 220 includes a second twin screw configuration,
in the drying section 230, the mixing section 230-1 includes a third twin-screw structure, and the preheating section 230-2, the drying section 230-3, and the cooling section 230-4 each include a fourth twin-screw structure, wherein the fourth twin-screw structures included in the preheating section 230-2, the drying section 230-3, and the cooling section 230-4 are the same or different.
The first twin-screw structure 211 may be a twin screw made of metal, and is used to continuously convey the microsphere slurry containing a large amount of water to the second twin-screw 221.
The second twin-screw structure 221 can be twin-screw made of metal, and is used for solid-liquid separation to obtain wet cake with less water, and continuously conveying the wet cake to the third twin-screw 231, the length-diameter ratio of the twin-screw body of the second twin-screw structure 221 is 50-70,
the third twin-screw structure 231 may be a twin screw of a metal material, and is configured to mix with the additive added by the additive adding device 300, and continuously feed the mixed wet powder to the fourth twin-screw 232,
the fourth twin-screw structure 232 may be a metal twin-screw, and according to the conventional control principle of the twin-screw, the temperatures of the twin-screw are controlled at different parts, so as to realize the preheating, drying and cooling functions, and output the dried microsphere powder. The twin screw body of the fourth twin screw structure 232 can have a length to diameter ratio of 30-36.
In one embodiment, in the drying apparatus 200, the first and second twin-screw structures are the same, and the third and fourth twin-screw structures are different.
In one embodiment, the second double-screw structure 221 is provided with two screws which are meshed with a plurality of obliquely arranged paddles; the included angle formed by the paddles and the axial lead of the screw body is 45-60 degrees, and the distance between adjacent paddles along the axial lead is 3-5 cm. If the included angle is too small, the speed of the conveyed microsphere slurry is too slow, so that the microsphere dehydration efficiency is insufficient; if the included angle is too large, the speed of conveying the wet microsphere cake is too fast, and the water content of the wet microsphere cake is high.
In one embodiment, in the drying apparatus 200, the interior of the infeed section 210, the interior of the dewatering section 220, the interior of the drying section 230, and the interior of the outfeed section 240 are in communication.
In the dry-out region 230, the dry-out region,
the mixing section 230-1 is used for mixing the wet cake with a processing aid to form a wet microsphere powder;
the preheating section 230-2 is used for starting to heat up so that the processing aid is coated on the surface of the microsphere;
the drying section 230-3 is used for drying the uniformly mixed wet microsphere powder;
the cooling section 230-4 is used for cooling the dried microspheres and further conveying the microspheres to the discharging section.
In one embodiment, the discharge section 240 may be a hollow cylinder structure for outputting the dry powder of microspheres conveyed by the cooling section 230-4.
In one embodiment, the drying apparatus 200 further comprises a barrel 201, the barrel 201 surrounding the coaxial twin-screw structure. The barrel 201 may be a metallic barrel structure for forming a continuous shell outside the twin screw.
In one embodiment, the drying apparatus 200 further comprises a vent 202, the vent 202 being disposed in one or more of the dewatering section 220, the mixing section 230-1, the pre-heating section 230-2, and the drying section 230-3. 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.
In one embodiment, an auxiliary agent adding device 300 is disposed on the mixing section 230-1 of the drying section. The connection between the drying part 200 and the auxiliary agent adding device 300 may be a vertical connection, preferably a vertical fixed connection.
1.3 auxiliary agent adding device
The additive adding device 300 may be an additive hopper. A coupling for increasing the feed rate may be present in the additive hopper. The additive hopper is used for adding processing additives.
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. The solid processing aid can improve the filling rate of materials in a screw groove of a screw mixing section, increase the heat conduction effect between the screw and the microsphere wet cake and promote the discharge of water vapor from the exhaust port 202 during the drying of the microsphere.
In one embodiment, the processing aid is preferably 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.
The processing aid can also be a liquid product, and castor oil, silicone oil, tween 60, liquid paraffin, a silane coupling agent, polyethylene glycol, dioctyl phthalate, AMP-95 of dow chemical, and the like can be used. Preferably, dioctyl phthalate is used as the liquid product.
In one embodiment, the connections of the barrel 201 to the feed device 100, the additive addition device 300, the effluent collection device 400, and the vent 202 and drain 222 are all sealed connections.
1.4 discharged material collecting device
In one embodiment, the discharge collection unit 400 is a freely removable container, which may be plastic or metal, that is flanged to the discharge section 240.
1.5 other devices
In one embodiment, the drying system of the present invention further comprises a lateral coupling 500, wherein the lateral coupling 500 is disposed at the feeding section and is fixedly connected with the twin-screw body of the second twin-screw structure 221. The transverse coupler 500 is used for connecting the two twin screws through a reduction gear to drive the twin screws to rotate.
In one embodiment, the drying system of the present invention further comprises a frame 600, and a main motor and a reduction gearbox can be disposed in the frame 600, wherein the reduction gearbox can control the rotation speed of the main motor, and the reduction gearbox and the main motor are matched to facilitate the adjustment of the rotation speed of the transverse coupling. Further, the drying device 200 may be provided on the frame 600.
2. Method for drying expandable microspheres
The method of drying expandable microspheres of the present invention is described in detail below.
According to one embodiment of the present invention, the method of drying expandable microspheres of the present invention comprises the steps of:
feeding: adding microsphere slurry synthesized by suspension polymerization into the feeding device 100 and conveying the microsphere slurry to a feeding section of the drying device;
and (3) dehydrating: transporting the microsphere slurry from the feed section 210 to the dewatering section 220, dewatering the microsphere slurry in the dewatering section 220, thereby obtaining a wet cake;
mixing: outputting the wet cake from the dewatering section 220 to the mixing section 230-1 of the drying part 230, and simultaneously adding a processing aid to the mixing section 230-1 of the drying part 230 by the aid adding device 300, so that the wet cake and the processing aid are mixed to form wet powder;
and (3) drying: the wet powder is transported from the mixing section 230-1 of the drying part 230 to the drying section 230-3 of the drying part 230, and the wet powder is heated and dried in the drying section 230-3 to obtain dry powder, i.e. expandable microspheres.
2.1 feeding step
In one embodiment, the rotation speed of the paddles in the conical hopper of the feeding device 100 may be 30 to 90rpm, preferably 40 to 50rpm, in the feeding step. If the rotating speed is too high, the microsphere slurry can splash everywhere, further 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 wet powder content of the microspheres obtained in the dewatering section 220 is further uncertain, so that the addition amount of the auxiliary agent adding device 300 cannot be calculated. The feed rate in the conical hopper may be 300-. The temperature of the feed section may be room temperature.
2.2 dehydration step
In one embodiment, in the dewatering step, the rotational speed of the Oldham coupling 500 is 50-100rpm, preferably 60-80rpm, which is matched to the rotational speed of the paddles in the conical hopper of the feeding device 100, in order to obtain a determined amount of wet micro-spherical powder for entering the dewatering section. The temperature of the dewatering section may be room temperature.
In one embodiment, in the dewatering step, the dewatering of the microsphere slurry is completed while the dewatering section 220 is transporting the material by adjusting the speed of the material transported in the tapered hopper of the feeding device 100 and the rotational speed of the cross coupling 500. One or more drain ports 222 may be provided below the barrel 201 at the dewatering section 220.
2.3 mixing step
In one embodiment, in the mixing step, the resulting wet powder may have a solid content of 60% or more, preferably 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 one embodiment, the processing aid is mixed with the microspheres in the mixing step to prevent the microspheres from blocking during drying, thereby causing agglomeration. 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.
2.4 drying step
In one embodiment, in the drying step, the wet powder (microsphere wet powder) mixed with the 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 powder is heated to become steam and is discharged through the vent 202. The vent 202 includes a screen plate and a filter medium, thereby preventing microspheres from exiting the vent 202.
The invention prevents the microspheres from agglomerating during the drying step by adding a processing aid. The processing aid includes solid products and liquid products. From the viewpoint of the effect of easily removing moisture, a solid product is preferable. Specific examples of the solid product and the liquid product are as described above.
In one embodiment, in the drying step, the wet powder is transported from the mixing section of the drying section to the preheating section of the drying section, preheated, and then transported to the drying section of the drying section.
In one embodiment, in the drying step, the temperatures of the feeding section, the dehydrating section, the mixing section and the cooling section are all 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.
Specifically, the temperature of the drying section can be determined according to the T of the microsphere foamingstartAnd (4) selecting. 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.
2.5 further steps
Optionally, in one embodiment, the method further comprises, after the drying step: conveying the powder from the drying section to a cooling section for cooling and conveying to a discharging section; and conveying the powder from a discharge section to the discharge collection device. Particularly, the powder enters the sealed discharging and collecting device which can be detached at any time through the discharging opening of the discharging section, so that the dust environmental pollution of the 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 embodiment 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 present 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, microsphere slurry (wherein the microspheres are low-temperature microspheres) which is synthesized by suspension polymerization and has the water content of 90 percent is added into a conical feeding hopper of a feeding device 100 (Honggao machinery Co., Ltd., PSA), the feeding speed is 300kg/h, and the rotating speed of a vertical feeding screw device in the feeding device 100 is 40 rpm.
The microsphere slurry WU150 was then fed to the feed section 210 (at room temperature) of the drying apparatus 200 (where the first twin-screw configuration 221 of the feed section 210 was from precision plastics machinery, llc, eastern guan). The cross coupling 500 (from taixin precision plastic machinery, ltd) fixedly attached to the twin screw body of the twin screw configuration of the drying apparatus 200 was rotated at 60 rpm.
(2) The microsphere slurry was then transported from the feed section 210 to the dewatering section 220 (at room temperature) where quantitative dewatering of the slurry was accomplished by a second twin screw configuration 221 (from taixin precision plastic machinery, inc.) to produce a wet cake.
(3) Under the driving of the second double-screw structure, the wet cake enters the mixing section 230-1 of the drying part 230 (the temperature is room temperature, the third double-screw structure is from Shanghai Baobao dish plastic equipment Co., Ltd.), and meanwhile, the calcium carbonate processing aid (Shanghai Aladdin Biotechnology Co., Ltd.) is added into the mixing section 230-1 of the drying part 230 from the aid adding device 300, and the addition amount is 0.5kg/h, so as to obtain wet powder.
(4) The wet powder is conveyed from the mixing section 230-1 to a preheating section 230-2 (the temperature is 70 ℃, wherein the fourth twin-screw structure is from jinxin mechanical limited, shenzhen), wherein the adhesion of the processing aid to the surface of the microsphere is caused as the microsphere shell is softened. The wet powder is then conveyed to a drying section 230-3 (at 100 ℃) where it is dried to give an unexpanded, well dispersed dry powder (microspheres).
(5) The dry powder is transported from the drying section 230-3 to the cooling section 230-4 (at room temperature) for cooling, and transported to the discharging section 240 (at room temperature), and then enters the sealed discharging collection device 400 (plastic container) through the discharging port of the discharging section 240.
Thereby preferably using the above described apparatus to achieve continuous drying of the microsphere slurry.
Example 2
The process flow of example 2 is substantially the same as that of example 1, except for the following:
in the step (1), microsphere slurry (wherein the microspheres are low-temperature microspheres) which is synthesized by suspension polymerization and has a water content of 90% is added into a conical feeding hopper of a feeding device 100, the feeding speed is 350kg/h, and the rotating speed of a vertical feeding screw device in the feeding device 100 is 60 rpm;
in step (3), the processing aid from the aid adding device 300 is a dioctyl phthalate processing aid (Shanghai Aladdin Biotechnology Co., Ltd.), and the addition amount is 1 kg/h.
The dried powder (microspheres) is obtained after drying in the drying section 230-3 and is unexpanded and has good dispersibility.
Example 3
The process flow of example 3 is essentially the same as that of example 1, except for the following:
in the step (1), microsphere slurry (wherein the microspheres are high-temperature microspheres) which is synthesized by suspension polymerization and has a water content of 80% is added into a conical feeding hopper of a feeding device 100, the rotating speed of a vertical feeding screw device of the feeding device 100 is 60rpm, and the rotating speed of a transverse coupling 500 is 70 rpm;
in the step (3), the processing aid from the aid adding device 300 is a silicon dioxide processing aid (Shanghai Aladdin Biotechnology Co., Ltd.), and the adding amount is 1 kg/h;
in the step (4), the temperature of the preheating section 230-2 is 100 ℃ and the temperature of the drying section 230-3 is 140 ℃.
The dried powder (microspheres) is obtained after drying in the drying section 230-3 and is unexpanded and has good dispersibility.
Example 4
The process flow of example 4 is essentially the same as that of example 1, except for the following:
in the step (1), microsphere slurry (wherein the microspheres are high-temperature microspheres) which is synthesized by suspension polymerization and has a water content of 80% is added into a conical feeding hopper of a feeding device 100, the feeding speed is 350kg/h, the rotating speed of a transverse coupling 500 is 70rpm,
in step (3), the processing aid from the aid adding device 300 is a polyethylene glycol processing aid (Shanghai Aladdin Biotechnology Co., Ltd.) in an amount of 1 kg/h.
In the step (4), the preheating section 230-2 and the cooling section 230-4 are omitted, the temperature of the drying section 230-3 is 145 ℃,
step (5) is omitted.
The dried powder (microspheres) is obtained after drying in the drying section 230-3 and is unexpanded and has good dispersibility.
Experimental example 1 Water content test of microspheres
100g of microspheres obtained in examples 1 to 4 were weighed, and the microspheres were dried in an oven (Canno, Guangzhou, pharmaceutical machinery, Inc.) at 50 ℃ to dry water continuously, 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:
water content of dried microspheres
M0Quality of microspheres before placing in oven
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 different types of microsphere slurries are dried in the above manner, and the water content of the dried microspheres is between 0.2% and 0.7%, which indicates that the dried microspheres with extremely low water content can be obtained by the above drying method.
Experimental example 2 microscopic Observation of microsphere Dry powder
The dry powder (microspheres) obtained in example 1 was observed with a microscope.
1g of the dried microspheres was put in a test tube, 10mL of water was added, and the mixture was mixed with a 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. 5.
As can be seen from fig. 5, the microspheres after drying were uniformly dispersed, indicating that the microspheres with good dispersibility were obtained by the above-mentioned drying method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (17)
1. An expandable microsphere drying system, comprising:
(1) a feeding device, a feeding device and a feeding device,
(2) drying device, drying device transversely includes in proper order:
a feeding section, a discharging section and a feeding section,
in the dewatering section, the water is removed,
a drying section which comprises a mixing section, an optional preheating section, a drying section and an optional cooling section in sequence in the transverse direction,
a discharging section is arranged at the bottom of the feeding device,
wherein the feeding section, the dewatering section and the drying part comprise coaxial double-screw structures;
wherein the feeding device is arranged in the feeding section, and the interior of the feeding device is communicated with the interior of the feeding section; and
(3) the auxiliary agent adding device is arranged in the mixing section, and the interior of the auxiliary agent adding device is communicated with the interior of the mixing section;
(4) a discharge collection device disposed in the discharge section, just the interior of the discharge collection device is communicated with the interior of the discharge section.
2. The expandable microsphere drying system of claim 1,
the feeding device comprises a conical feeding hopper, a motor is arranged at the top of the conical feeding hopper, the motor is fixedly connected with a central shaft of the feeding device, a conical screw propeller is arranged on the central shaft, and the conical screw propeller sequentially reduces the radius from top to bottom.
3. The expandable microsphere drying system of claim 1,
in the drying device, the dewatering section comprises a water discharge port and a filter screen, and the mesh size of the filter screen is 50-100 meshes.
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 dewatering section includes a second double screw configuration,
in the drying station, the mixing section comprises a third twin screw structure,
the preheating section, the drying section and the cooling section respectively comprise a fourth twin-screw structure, wherein the fourth twin-screw structures of the preheating section, the drying section and the cooling section are the same or different.
5. The expandable microsphere drying system of claim 4,
the first and second twin-screw structures are the same, and the third and fourth twin-screw structures are different.
6. The expandable microsphere drying system of claim 1,
in the drying device, the interior of the feeding section, the interior of the dewatering section, the interior of the drying section and the interior of the discharging section are communicated.
7. The expandable microsphere drying system of claim 1,
the drying apparatus further includes a barrel surrounding the coaxial twin-screw structure.
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 dehydration section, the mixing section, the preheating section and the drying 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 of the drying device.
10. The expandable microsphere drying system of claim 1,
the drying system further comprises a frame, and the drying device is arranged on the frame.
11. A method for drying expandable microspheres using the expandable microsphere drying system according to any one of claims 1 to 10, comprising the steps of:
feeding: adding microsphere slurry synthesized by suspension polymerization into the feeding device, and conveying the microsphere slurry to a feeding section of the drying device;
and (3) dehydrating: transporting the microsphere slurry from the feed section to the dewatering section, dewatering the microsphere slurry in the dewatering section, thereby obtaining a wet cake;
mixing: outputting the wet cake from the dewatering section to a mixing section of the drying part, and adding a processing aid to the mixing section of the drying part through the aid adding device to mix the wet cake and the processing aid to form wet powder;
and (3) drying: and conveying the wet powder from the mixing section of the drying part to the drying section of the drying part, and heating and drying the wet powder in the drying section to obtain dry powder.
12. The method of claim 11,
in the feeding step, the feeding speed of the microsphere slurry is 300-500 kg/h.
13. The method of claim 11,
in the mixing step, the solid content of the wet powder is 60% or more.
14. The method of claim 11,
in the mixing step, the processing aid is a solid processing aid.
15. The method of claim 11,
in the drying step, the wet powder is conveyed from the mixing section of the drying section to the preheating section of the drying section, preheated, and then conveyed to the drying section of the drying section.
16. The method of claim 11,
the temperature of the feeding section, the dehydrating 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.
17. The method of claim 11,
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.
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