CN110841571A - Device and method for producing prefoamed microcapsules - Google Patents
Device and method for producing prefoamed microcapsules Download PDFInfo
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- CN110841571A CN110841571A CN201911337649.1A CN201911337649A CN110841571A CN 110841571 A CN110841571 A CN 110841571A CN 201911337649 A CN201911337649 A CN 201911337649A CN 110841571 A CN110841571 A CN 110841571A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/04—Making microcapsules or microballoons by physical processes, e.g. drying, spraying
Abstract
The present invention provides an apparatus and a method for preparing pre-expanded microcapsules, the apparatus comprising: (1) a feeding device; (2) a foaming device, the foaming device transversely includes in proper order: the device comprises a feeding zone, a dispersing zone, a preheating zone, a heating zone and a cooling zone, wherein the feeding zone, the dispersing zone, the preheating zone, the heating zone and the cooling zone comprise an integrated continuous shaftless screw structure, the feeding device is arranged in the feeding zone, and the interior of the feeding device is communicated with the interior of the feeding zone; (3) the cylinder inner air blowing device is arranged in the dispersion area, and the interior of the cylinder inner air blowing device is communicated with the interior of the dispersion area; and (4) a collection device disposed in the cooling zone, and an interior of the collection device is in communication with an interior of the cooling zone. The invention can effectively prevent the foamable microcapsules from being bonded with each other in the heating foaming process, thereby efficiently and controllably preparing the non-caking prefoaming microcapsules.
Description
Technical Field
The invention belongs to the field of chemical machinery, and relates to a device for preparing pre-foamed microcapsules and a method for preparing the pre-foamed microcapsules by using the device.
Background
Pre-expanded microcapsules are those which are prepared by heating expandable microcapsules, the blowing agent in the capsule shell evaporating to generate internal pressure upon heating of the blowing agent, and the microcapsules expanding as the capsule shell softens, typically increasing in diameter by a factor of about 2 to 5 to produce a density of 0.015 to 0.3Kg/m3The core-shell structure polymer microcapsule filler of (1), the diameter of which is 10 to 500 um.
The foamable microcapsule is one kind of microcapsule with core-shell structure synthesized through suspension polymerization and consists of airtight shell and sealed foaming agent. The pre-foamed microcapsule as light stuffing is used widely in aeronautics and astronautics, high iron, automobile and other industrial fields, paint, heat insulating material, sealing material, etc. The automotive industry uses ultra-lightweight materials in underbody coatings, tires, composites, and adhesives.
The synthesis and foaming techniques of foamable microcapsules are reported in patents such as US3615972, EP486080, EP566367, CN201610792097.3, CN201510483687.3, CN201280073857.5, CN 2012100109302.3, etc. Due to the difference of the synthesis processes, the microcapsules can be divided into low-temperature, medium-high temperature, high-temperature and ultrahigh-temperature microcapsules according to the foamable temperature range of the microcapsules. The fast-thinking technologies (shanghai) ltd may provide foamable microcapsules in various forms of dry powders and filter cakes, including foamed and unfoamed forms, with microcapsules of both low-temperature WU1501 and high-temperature DU608 brands being the best known.
Both unfoamed and foamed forms of foamable microcapsules are marketed, but since the foamed microcapsules are of low density and are ultra-light powders, which are inconvenient to produce, transport and sell, users generally prepare the foamed microcapsules on site, i.e., purchase the foamable microcapsules in unfoamed form to be added to a production facility for continuous production of the final product.
CN105396524B provides a foamed microcapsule preparation device; the device adds the torrent device, sets up open tube structure and arc and assembles the section through the setting, can prevent effectively that the microcapsule foamer from agglomerating at the foaming in-process, but its production efficiency is low, and maneuverability is poor, and equipment utilization is low, can not adjust the different temperature interval's of prefoaming microcapsule production process at any time.
US5342689 describes a process for the preparation of pre-expanded microcapsules wherein the microcapsules are mixed with a surface barrier coating to prevent caking during the foaming step, but the solid processing aids, used in very high amounts, make it difficult to control the degree of foaming of the microcapsules.
CN105150494A proposes a device and a method for continuously preparing pre-foamed microcapsules, which well solve the problems of bridging, blocking and poor fluidity of raw materials during feeding, wherein a double screw is used to continuously prepare the pre-foamed microcapsules from a filter cake, but the problems of high operation temperature, easy roller sticking of the microcapsules and the like exist.
CN100429061C proposes a method for preparing foamed thermoplastic microspheres by filling foamed microspheres into a foaming apparatus, the foaming apparatus has a hollow body surrounding a rotary feeding device, one or more scrapers are arranged between the outer diameter of the rotary feeding device and the inner diameter of the hollow body, which can prevent the accumulation of microsphere layer in the foaming apparatus, but the apparatus has large volume, complicated feeding procedure, high apparatus wear rate, especially the inner scrapers are easy to wear, and cannot be operated continuously for a long time, and the agglomeration of foamed microspheres is not completely solved.
The above-mentioned patent mentions a method and apparatus for preparing pre-foamed microcapsules by further heat-foaming foamable microcapsules, but the problem of blocking due to the softening and blocking of the thin thermoplastic shell of the microcapsules caused by the high temperature required for complete foaming during the complete foaming of the foamable microcapsules is not solved. In contrast, the present invention focuses on the combination of a foaming device and an in-cylinder blowing device, and the integrally continuous shaftless screw feeding structure is set to a mode comprising a feeding zone, a dispersing zone, a preheating zone, a heating zone and a cooling zone, so that the foamable microcapsules are sufficiently dispersed in the dispersing zone and the preheating zone of the shaftless screw structure under the action of hot air in the cylinder, and are further sufficiently dispersed and foamed in the heating zone, and the problem of adhesion and agglomeration of the foamed microspheres is effectively solved.
Disclosure of Invention
Therefore, in order to overcome the above disadvantages of the prior art, especially the problem of blocking and caking of the expanded microspheres, the present invention provides an apparatus for preparing pre-expanded microcapsules and a method for preparing pre-expanded microcapsules using the same, wherein pre-expanded microcapsules of different densities can be prepared by controlling the degree of expansion of the expandable microcapsules. The device has the advantages of small volume, low cost and simple operation, thereby saving the transportation space and the cost. By combining the device of the invention and utilizing the method provided by the invention, the foamable microcapsules can be effectively prevented from being bonded with each other in the heating foaming process, so that the non-caking prefoamed microcapsules can be efficiently and controllably obtained.
The technical scheme of the invention is realized by the following technical scheme:
in order to achieve the above object, according to one aspect of the present invention, there is provided a pre-expanded microcapsule preparation apparatus comprising:
(1) a feeding device;
(2) a foaming device, the foaming device transversely includes in proper order:
the material feeding area is provided with a material feeding area,
a dispersion area is arranged in the first and second dispersion areas,
a pre-heating zone, wherein the pre-heating zone is provided with a plurality of pre-heating zones,
a heating zone,
the cooling area is provided with a cooling area,
wherein the feeding zone, the dispersing zone, the preheating zone, the heating zone and the cooling zone comprise an integrated continuous shaftless screw structure,
wherein the feeding device is arranged in the feeding area, and the interior of the feeding device is communicated with the interior of the feeding area;
(3) the cylinder inner air blowing device is arranged in the dispersion area, and the interior of the cylinder inner air blowing device is communicated with the interior of the dispersion area; and
(4) a collection device disposed in the cooling zone, and an interior of the collection device in communication with an interior of the cooling zone.
According to another aspect of the present invention, there is provided a method for foaming expandable microcapsules using the above apparatus for preparing prefoamed microcapsules, the method comprising the steps of:
feeding: adding the microcapsule dry powder into the feeding device and conveying the microcapsule dry powder to a feeding area of the foaming device;
dispersing: conveying the microcapsule dry powder from the feeding area to a dispersing area of the foaming device, and blowing air to the dispersing area of the foaming device through an air blowing device in the cylinder to generate buoyancy in the cylinder so that the microcapsule dry powder is conveyed to a preheating area under the pushing of a shaftless screw structure of the dispersing area;
preheating: transferring the dry microcapsule powder from the dispersing zone to the preheating zone, wherein the dry microcapsule powder is preheated and further dispersed;
heating: conveying the hot microcapsule dry powder from a preheating zone of the foaming device to a heating zone of the foaming device, and heating and foaming the microcapsule dry powder in the heating zone to obtain pre-foamed microcapsules;
and (3) cooling: the prefoamed microcapsules are transported from the heating zone to the cooling zone of the foaming device while the prefoamed microcapsules are collected by a collecting device.
According to the pre-foaming microcapsule preparation device, the shaft-free screw structure of the foaming device is adopted, and the air is blown into the cylinder by the air blowing device in the cylinder, so that the continuous preparation of the pre-foaming microcapsules is realized, the pre-foaming microcapsules can be effectively prevented from caking in the preparation process, the production efficiency is improved, and the purposes of energy conservation and environmental protection are achieved.
In addition, the invention can prepare the pre-foaming microcapsules with different foaming temperature intervals and states by adopting a quantitative feeding device with spiral stirring and an integrated continuous shaftless screw structure. By controlling the temperature of the preheating zone and/or the heating zone, pre-expanded microcapsules of different expansion temperatures can be prepared.
The invention improves the reliability and the simplicity of the preparation of the pre-foaming microcapsule, effectively improves the operation efficiency, is convenient to process, has low cost and is beneficial to realizing mass production.
Compared with the prior art, the method of the invention well solves the problems of difficult continuous operation, aggregation, agglomeration and the like during the preparation of the pre-foaming microcapsule. According to the invention, the microcapsule dry powder can be directly dispersed by a screw, preheated, heated, foamed and cooled until the pre-foamed microcapsule with good dispersibility is finally generated.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention provides a method for directly preparing pre-foaming microcapsules from microcapsule dry powder by using a foaming device and an in-cylinder air blowing device by using the stirring and pushing effects of a shaftless screw structure for the first time and designing a mode of combining the foaming device and the in-cylinder air blowing device, greatly improves the production efficiency of the pre-foaming microcapsules, can prevent the problem of insufficient foaming during the preparation of the pre-foaming microcapsules, and realizes continuous preparation.
2. The invention adopts the feeding device with sealed spiral stirring, well solves the problems of blockage, bridging and the like during the blanking of the raw materials, and can continuously, uniformly and stably add the microcapsule dry powder into the foaming device.
3. The invention blows air into the cylinder through the air blowing device in the cylinder, and conveys hot air into the cylinder, so that the microcapsule dry powder is efficiently and uniformly heated, the material can be better foamed, the produced product is not easy to bond, and the dispersibility of the microcapsule after foaming can be effectively improved.
4. The invention adopts an integrated continuous shaftless screw structure, and can be suitable for preparing pre-foaming microcapsules in different foaming temperature intervals and states by controlling the temperature during heating.
Drawings
Fig. 1 is a schematic view of a pre-expanded microcapsule preparation apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic view of a quantitative impeller of a feeding device in a pre-expanded microcapsule preparation apparatus according to an embodiment of the present invention.
Fig. 3 is a microscopic image of pre-foamed microcapsules prepared according to example 1 of the present invention.
Reference numerals
100: feeding device
110: feed inlet
120: quantitative impeller
120-1: blade
120-2: roll shaft
200: foaming device
210: feeding zone
220: a dispersion zone
230: preheating zone
240: heating zone
250: cooling zone
260: shaftless screw structure
270: cylinder
300: driving rotating shaft
400: air blowing device in cylinder
500: limiting clamping sleeve
600: coupling device
700: collecting device
710: and an air outlet valve.
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. Pre-foaming microcapsule preparation device
In one embodiment of the present invention, as shown in fig. 1, there is provided a pre-expanded microcapsule preparation apparatus comprising:
(1) the feeding device (100) is provided with a feeding device,
(2) a foaming device 200, which comprises in order in the transverse direction:
the feed zone(s) 210 are,
the dispersion zone 220 is a zone of dispersion,
the pre-heating zone 230 is provided,
the heating area 240 is formed by a heating plate,
the cooling zone (250) is provided with,
wherein the feeding zone 210, the dispersing zone 220, the preheating zone 230, the heating zone 240, and the cooling zone 250 comprise an integrated continuous shaftless screw structure 260; under the action of the limiting clamp sleeve 500, the driving rotating shaft 300 drives the shaftless screw structure 260 to rotate;
wherein the feeding device 100 is disposed in the feeding zone 210, and the interior of the feeding device 100 is communicated with the interior of the feeding zone 210;
(3) the cylinder air blowing device 400, wherein the cylinder air blowing device 400 is arranged in the dispersion area 220, and the inside of the cylinder air blowing device 400 is communicated with the inside of the dispersion area 220; and
(4) a collection device 700, the collection device 700 being disposed in the cooling zone 250, and an interior of the collection device 700 being in communication with an interior of the cooling zone 250.
1.1 feeding device
In one embodiment, the feeding device 100 comprises a conical hopper, the whole hopper takes a sealed form, a circular feeding small opening 110 is arranged above the hopper, a motor is arranged at the top of the conical hopper, the motor is fixedly connected with a central shaft of the feeding device, a conical propeller is arranged on the central shaft, and the radius of the circumference of the conical propeller from top to bottom is reduced in sequence. Through the feeding device adopting spiral stirring, the dust problem during feeding is avoided, the problems of blocking, bridging and the like during microcapsule blanking are well solved, and the microcapsule dry powder continuously, uniformly and stably enters the foaming device.
In one embodiment, the connection of the feeding zone 210 to the feeding device 100 may be a vertical connection, preferably a vertical fixed connection. In one embodiment, the feeding device 100 further comprises a quantitative impeller 120 (as shown in fig. 2), the quantitative impeller 120 comprises a blade 120-1 and a roller 120-2, the blade 120-1 is located on the roller 120-2, the blade 120-1 forms an included angle θ (40-90 °) therebetween, and the microcapsule dry powder is quantitatively conveyed to the foaming device through a slot between the blades 120-1.
1.2 foaming device
In one embodiment, in the foaming device 200,
the feed zone 210 includes a first shaftless screw arrangement,
the dispersion zone 220 includes a second shaftless screw configuration,
the preheating zone 230 comprises a third shaftless screw configuration,
the heating zone 240 includes a fourth shaftless screw configuration,
the cooling zone 250 includes a fifth shaftless screw configuration,
wherein the feed zone 210, the dispersion zone 220, the preheating zone 230, the heating zone 240, and the cooling zone 250 each comprise shaftless screw configurations that are the same or different.
In one embodiment, in the foaming device 200, the interior of the feeding zone 210, the interior of the dispersion zone 220, the interior of the preheating zone 230, the interior of the heating zone 240, and the interior of the cooling zone 250 are in communication.
In one embodiment, the temperature of the preheating zone 230 and the heating zone 240 may be the same or different, but need to be higher than the minimum foaming temperature of the microcapsules (the initial foaming temperature T of the microcapsules)start)。
In one embodiment, an in-tube blowing device 400 is disposed on the dispersion zone 220 of the foaming device. The connection between the foaming device 200 and the in-cylinder blowing device 400 may be at an angle of 45 ° to the axial center line of the cylinder 270, and preferably is fixed at an angle of 45 °.
1.3 air blowing device in tube
The in-barrel blower 400 may be of any form. There may be a regulating valve in the blower 400 for controlling the aeration rate, and the blower in the drum is used for dispersing the microcapsule dry powder delivered to the dispersing zone 220 through the feeding zone 210.
The gas introduced into the cylinder blower 400 prevents the foamable microcapsules from sinking during foaming. The gas can be hot gas and room temperature gas, preferably hot gas, hot gas generated by the hot gas is beneficial to the floating of the microcapsule, and the heating area of the microcapsule can be increased; the microcapsule foaming is realized by controlling the air flow speed and the rotating speed of the shaftless screw structure, the heat conduction effect between the screw and the microcapsule dry powder is increased, and the foaming speed of the microcapsule is improved.
The gas may be a common gas, and hot air, nitrogen, carbon dioxide, argon, or the like may be used. Preferably, hot air is used as the aeration gas.
1.4 Collection device
In one embodiment, the collection device 700 is a removable sealed container, which may be plastic or metal, that is flanged to the cylinder 270.
1.5 other devices
In one embodiment, the apparatus for preparing pre-foamed microcapsules of the present invention further comprises a driving shaft 300, wherein the driving shaft 300 and the shaftless screw structure 260 are fixedly connected to the body under the action of the limiting clamping sleeve 500. The coupling 600 is used for connecting the shaftless screw structure 260 through the limiting clamping sleeve 500 and rotating under the action of the driving rotating shaft 300.
In one embodiment, the air flow in the cylinder is discharged from the air outlet valve 710, the air outlet valve 710 is connected with the collecting device 700 in a sealing way, the air outlet valve 710 is internally provided with a filter screen, and the diameter of the filter screen is larger than 500 meshes.
2. Method for preparing pre-foaming microcapsule
The method for preparing the pre-expanded microcapsules using the apparatus for preparing pre-expanded microcapsules of the present invention will be described in detail below.
According to one embodiment of the present invention, the process for the preparation of the prefoamed microcapsules of the present invention comprises the steps of:
feeding: dry microencapsulated powder is fed into the feeding device 100 and delivered to the feeding zone 210 of the foaming device 200;
dispersing: conveying the microcapsule dry powder from the feeding area 210 to the dispersing area 220, floating up and down along with the airflow under the buoyancy of the hot air generated by the cylinder blowing device 400, and dispersing the microcapsule dry powder in the dispersing area 220 of the cylinder 270, thereby obtaining the microcapsule dry powder suspended in the cylinder 270;
preheating: transporting the microcapsule dry powder from the dispersing zone 220 to the preheating zone 230, wherein the microcapsule dry powder is primarily foamed at a certain temperature to obtain incompletely foamed microcapsules, and transporting the incompletely foamed microcapsules to the heating zone 240 along with the shaftless screw structure 260;
heating: transporting said incompletely foamed microcapsules from said preheating zone 230 to said heating zone 240, heating said incompletely foamed microcapsules in said heating zone 240 to obtain fully foamed microcapsules;
and (3) cooling: the fully foamed microcapsules are transported from the heating zone 240 to the cooling zone 250, with the gas stream in the barrel being transported forward with the shaftless screw arrangement 260, resulting in pre-foamed microcapsules.
2.1 feeding step
In one embodiment, the rotation speed of the conical screw of the feeding device 100 may be 20 to 100rpm, preferably 50 to 80rpm, in the feeding step. The feed rate in the conical hopper can be 50-100 kg/h. The temperature of the feed section may be room temperature.
In one embodiment, at the quantitative impeller 120, it comprises blades 120-1 and a roller 120-2, the blades 120-1 are located on the roller 120-2, the angle between the blades 120-1 is θ (40-90 °), the angle is preferably 45 °, and the rotation speed is adjusted according to the feeding speed of the feeding device 100.
2.2 Dispersion step
In one embodiment, in the dispersing step, the air flow rate in the in-drum air-blowing device 400 is 8 to 15m/s, preferably 8 to 10m/s, and the gas is selected from air, preferably hot air;
in one embodiment, the in-barrel air-blowing device 400 is angled with respect to the barrel 270, preferably at 45 ° to the axis of the barrel 270 in order to match the buoyancy force created by the air flow to the process of advancing the foamed microcapsules.
2.3 preheating step
In one embodiment, the rotation speed of the driving shaft 300 is 50 to 100rpm, preferably 80 to 90rpm, which is matched to the rotation speed of the conical screw of the feeding device 100 in the preheating step. The temperature of the preheating zone can be adjusted according to the foaming temperature of the microcapsules:
for low temperature microcapsules, the temperature in the preheating zone may be in the range of 80 to 120 c, preferably 90 to 100 c,
for high temperature microcapsules, the temperature of the preheating zone may be 150-.
2.4 heating step
In one embodiment, in the heating step, the preheated microcapsule dry powder is heated to be sufficiently foamed.
The invention solves the problems of microsphere sinking, uneven heating in the heating step and insufficient foaming in the microcapsule foaming process by the air blowing device in the cylinder, and the design of the used optimized gas and device has optimization in the dispersion step.
In one embodiment, in the heating step, the heating zones are all at a temperature higher than the minimum foaming temperature of the microcapsules, and the preheating temperature zone and the heating zones may be the same or different.
In particular, the temperature of the heating zone may be dependent on the T of the microcapsule foamingstartAnd (4) selecting. In principle, the temperature in the heating zone is compared with the T of the microcapsulesstartThe height is 20-50 ℃.
For low temperature microcapsules, the temperature of the heating zone may be 120-170 deg.C, preferably 140-160 deg.C,
for high temperature microcapsules, the temperature of the heating zone may be 170-.
2.5 Cooling step
In one embodiment, the method further comprises, after the heating step: transferring the foamed microcapsule powder from the heating zone 240 to a cooling zone 250 and further to a collecting device 700;
in particular, the microcapsule foaming is collected by a sealed heat-preservation foaming device which can be detached at any time, so that the dust environmental pollution of the powder is reduced.
Example 1
The method of this example was carried out using the pre-expanded microcapsule preparation apparatus shown in fig. 1, and comprises the steps of:
(1) firstly, adding the microcapsule dry powder (wherein the microcapsules are low-temperature microcapsules) into a conical hopper of a feeding device 100 at a feeding speed of 100kg/h, and rotating a vertical feeding screw device in the feeding device 100 at a speed of 50 rpm.
The microcapsule dry powder is then transported to the feeding zone 210 of the foaming device 200. The rotation speed of the driving rotating shaft 300 fixedly connected with the integrated continuous shaftless screw structure 260 of the foaming device 200 is 50 rpm.
(2) The microencapsulated dry powder is then transported from the feeding zone 210 to the dispersing zone 220, and the dispersion of the dry powder is completed under the action of the air flow in the drum air blowing device 400.
(3) Under the push of the shaftless screw structure in the preheating zone 230, the floated microcapsule dry powder is contacted with the shaftless screw structure of the preheating zone 230 in the cylinder to form incompletely foamed microcapsules.
(4) The incompletely foamed microcapsules are transported from the pre-heating zone 230 to the heating zone 240, wherein the incompletely foamed microcapsules are sufficiently foamed in the heating zone 240 as the temperature is increased and the heating time is increased, to form completely foamed pre-foamed microcapsules.
(5) The pre-foamed microcapsules are transported to a collecting device 700 through a cooling zone 250 and finally collected through a discharge port of the collecting device 700.
As can be seen from the micrograph in FIG. 3, with the apparatus and process of the present invention, pre-expanded microcapsules are obtained which are free from agglomerated lumps and are sufficiently expanded.
The continuous production of prefoamed microcapsules is thus advantageously achieved using the apparatus according to the invention.
The foregoing is merely a preferred embodiment of the present invention, and it should be understood that the present invention is not limited to the specific embodiment described above. 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 construed as the protection scope of the present invention.
Claims (14)
1. A pre-foaming microcapsule preparation device is characterized by comprising:
(1) a feeding device;
(2) a foaming device, the foaming device transversely includes in proper order:
the material feeding area is provided with a material feeding area,
a dispersion area is arranged in the first and second dispersion areas,
a pre-heating zone, wherein the pre-heating zone is provided with a plurality of pre-heating zones,
a heating zone,
the cooling area is provided with a cooling area,
wherein the feeding zone, the dispersing zone, the preheating zone, the heating zone and the cooling zone comprise an integrated continuous shaftless screw structure,
wherein the feeding device is arranged in the feeding area, and the interior of the feeding device is communicated with the interior of the feeding area;
(3) the cylinder inner air blowing device is arranged in the dispersion area, and the interior of the cylinder inner air blowing device is communicated with the interior of the dispersion area; and
(4) a collection device disposed in the cooling zone, and an interior of the collection device in communication with an interior of the cooling zone.
2. The apparatus for producing pre-expanded microcapsules according to claim 1,
the feeding device comprises a conical feeding hopper in a sealing mode, a round feeding small opening is formed in the upper portion of the 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 propeller is arranged on the central shaft, and the conical propeller sequentially reduces the radius from top to bottom.
3. The apparatus for producing pre-expanded microcapsules according to claim 1,
the feeding device comprises a quantitative impeller, the quantitative impeller comprises blades and a roll shaft, the blades are positioned on the roll shaft, an included angle of 40-90 degrees is formed between the blades, and microcapsule dry powder is quantitatively conveyed to the foaming device through a clamping groove between the blades.
4. The apparatus for producing pre-expanded microcapsules according to claim 1,
in the foaming device, the foaming device is provided with a foaming chamber,
the feed zone includes a first shaftless screw arrangement,
the dispersion zone includes a second shaftless screw arrangement,
the preheating zone comprises a third shaftless screw arrangement,
the heating zone comprises a fourth shaftless screw arrangement,
the cooling zone includes a fifth shaftless screw arrangement,
wherein the feed zone, the dispersion zone, the preheating zone, the heating zone, and the cooling zone each comprise shaftless screw configurations that are the same or different.
5. The apparatus for producing pre-expanded microcapsules according to claim 1,
in the foaming apparatus, the inside of the feeding zone, the inside of the dispersing zone, the inside of the preheating zone, the inside of the heating zone, the inside of the cooling zone are communicated.
6. The apparatus for producing pre-expanded microcapsules according to claim 1,
in the foaming device, the temperature of the preheating zone and the temperature of the heating zone are the same or different and are both higher than the minimum foaming temperature of the microcapsule dry powder.
7. The apparatus for producing pre-expanded microcapsules according to claim 1,
the in-cylinder air-blowing device is arranged on the dispersion area of the foaming device in a manner of forming an angle of 45 degrees with the axial lead of the cylinder.
8. The apparatus for producing pre-expanded microcapsules according to claim 1,
the collecting device is provided with an air outlet valve, a filter screen is arranged in the air outlet valve, and the aperture of the filter screen is larger than 500 meshes.
9. The apparatus for producing pre-expanded microcapsules according to claim 1,
the pre-foaming microcapsule preparation device further comprises a driving rotating shaft and a coupling, wherein the driving rotating shaft and the coupling are fixedly connected with the integrated continuous shaftless screw structure through a limiting clamping sleeve.
10. The apparatus for preparing prefoamed microcapsules according to any of claims 1 to 9, wherein the process comprises the steps of:
feeding: adding the microcapsule dry powder into the feeding device and conveying the microcapsule dry powder to a feeding area of the foaming device;
dispersing: conveying the microcapsule dry powder from the feeding area to a dispersing area of the foaming device, and blowing air to the dispersing area of the foaming device through an air blowing device in the cylinder to generate buoyancy in the cylinder, so that the microcapsule dry powder is conveyed to a preheating area under the pushing of a shaftless screw structure of the dispersing area;
preheating: transferring the dry microcapsule powder from the dispersing zone to the preheating zone, wherein the dry microcapsule powder is preheated and further dispersed;
heating: conveying the hot microcapsule dry powder from a preheating zone of the foaming device to a heating zone of the foaming device, and heating and foaming the microcapsule dry powder in the heating zone to obtain pre-foamed microcapsules;
and (3) cooling: the prefoamed microcapsules are transported from the heating zone to the cooling zone of the foaming device while the prefoamed microcapsules are collected by a collecting device.
11. The method of claim 10,
in the feeding step, the rotating speed of a conical propeller in the feeding device is 20-100rpm, and the feeding speed of the microcapsule dry powder is 50-100 kg/h.
12. The method of claim 10,
in the dispersion step, the gas in the drum air-blowing device is air, and the air flow speed is 8-15 m/s.
13. The method of claim 10,
in the step of pre-heating,
for low temperature microcapsules, the temperature in the preheating zone is 80-120 ℃,
for high temperature microcapsules, the temperature in the preheating zone is 150-.
14. The method of claim 10,
in the step of heating, the heating step is carried out,
the temperature of the heating zone is 20-50 ℃ higher than the lowest foaming temperature of the microcapsule dry powder,
for the low-temperature microcapsule, the temperature of the heating zone is 120-170 ℃,
for high temperature microcapsules, the temperature of the heating zone is 170-250 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911337649.1A CN110841571A (en) | 2019-12-23 | 2019-12-23 | Device and method for producing prefoamed microcapsules |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911337649.1A CN110841571A (en) | 2019-12-23 | 2019-12-23 | Device and method for producing prefoamed microcapsules |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240659A (en) * | 2020-10-17 | 2021-01-19 | 温州桑盾信息科技有限公司 | Capsule machine safety protection is with automatic cooling mechanism |
| CN115368695A (en) * | 2022-08-08 | 2022-11-22 | 贵州师范大学 | Functional thermal expansion type foaming microcapsule and preparation method and application thereof |
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| CN115368695A (en) * | 2022-08-08 | 2022-11-22 | 贵州师范大学 | Functional thermal expansion type foaming microcapsule and preparation method and application thereof |
| CN115368695B (en) * | 2022-08-08 | 2023-09-19 | 贵州师范大学 | Application method of functional thermal expansion type foaming microcapsule |
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