CN110860260A - Continuous preparation system and method for ultra-light material - Google Patents
Continuous preparation system and method for ultra-light material Download PDFInfo
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- CN110860260A CN110860260A CN201911336739.9A CN201911336739A CN110860260A CN 110860260 A CN110860260 A CN 110860260A CN 201911336739 A CN201911336739 A CN 201911336739A CN 110860260 A CN110860260 A CN 110860260A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/72—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F2035/99—Heating
Abstract
The invention provides an ultra-light material preparation system and a method for preparing ultra-light material by using the system, wherein the system comprises: (1) a feeding device, and (2) a double-screw mixing and heating device, which comprises the following components in sequence in the transverse direction: the device comprises a feeding zone, a mixing and dispersing zone, a preheating zone and a heating zone, wherein the heating zone sequentially comprises a first heating section, a second heating section and a third heating section in the transverse direction, the feeding zone, the mixing and dispersing zone, the preheating zone and the heating zone comprise coaxial double-screw structures, and a feeding device is arranged in the feeding zone and is communicated with the feeding zone; (3) the auxiliary agent adding device is arranged in the mixing and dispersing area, and the interior of the auxiliary agent adding device is communicated with the interior of the mixing and dispersing area; and (4) a heat-insulating foaming device which is arranged in the third heating section and is internally communicated with the inside of the third heating section. The invention can realize the continuous preparation of the ultra-light material and effectively prevent the expandable microspheres from being bonded with each other in the heating and foaming process.
Description
Technical Field
The invention relates to a continuous preparation system of an ultra-light material, and also relates to a method for preparing the ultra-light material by using the system.
Background
The ultra-light material is prepared by heating and foaming expandable microspheres, and the density of the material is 0.015-0.3Kg/m3The hollow plastic microsphere filler of (2), the diameter of which is 10 to 500 um.
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, irreversible foaming occurs, and pre-expanded microspheres (ultra-light materials) are generated. The ultra-light material is widely applied to the industrial fields of aerospace, high-speed rail, automobiles and the like, coatings, heat-insulating materials, sealing materials and the like as a light filler. The automotive industry uses ultra-lightweight materials in underbody coatings, tires, composites, and adhesives.
The synthesis and foaming techniques of microspheres are reported in patents such as US3615972, EP486080, EP566367, CN201610792097.3, CN201510483687.3, CN201280073857.5 and CN 2012100109302.3. Due to the difference of the synthesis process, the microspheres can be divided into low-temperature, medium-high temperature, high-temperature and ultrahigh-temperature microspheres according to the foamable temperature range of the microspheres. The fast-thinking technologies (shanghai) ltd may provide various different forms of expandable microspheres, including expanded and unexpanded forms, of dry powders and filter cakes, of which low-temperature WU1501 and high-temperature DU608 brands are best known.
Both the unfoamed and the foamed forms of the expandable microspheres are sold in the market, but the foamed microspheres (ultra-light materials) are ultra-light powder with low density, so that the production, transportation and sale of the foamed microspheres are inconvenient, and users generally prepare the foamed microspheres on site, namely purchase a filter cake of the unfoamed expandable microspheres to be added into production equipment for continuously preparing final products.
After the collection of the expandable microspheres from the aqueous phase, the filter cake is dewatered and further dried to form a free flowing dispersible powder. Because the spheres are temperature sensitive (depending 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 filter cake, resulting in failure to obtain pre-expanded microspheres with good dispersibility in the end.
Numerous patents have mentioned methods and apparatus for drying foamed microsphere blowing agents. As both US8247465 and US8329298 mention the step of adhering a particulate filler to the outer surface of the microsphere shell, which contributes to improving the dispersibility and flowability of the microspheres upon drying, but this operation is very demanding on the equipment, the procedure is difficult to control, and it is difficult to maintain the quality and uniformity of the product. CN105396524B provides a device for preparing a foamed microsphere foaming agent; the device adds the torrent device, sets up open tubular construction and arc and assembles the section through the setting, can prevent effectively that the microballon 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 microballon production process at any time. 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 from wet cake. However, the above-mentioned patent mentions an apparatus and a method for preparing an ultra-lightweight material by further heat-foaming a wet cake having a low water content, and the problems of agglomeration and insufficient foaming when heating a foamed microsphere cake are not solved.
Therefore, there is a need for a continuous preparation system and method for ultra-light materials that overcomes the above-mentioned disadvantages.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an ultra-light material preparation system and a method for preparing ultra-light material by using the system, which can realize continuous preparation of ultra-light material and effectively prevent the foaming microspheres from bonding with each other in the heating foaming process.
In order to achieve the above object, according to one aspect of the present invention, there is provided an ultralight material production system including:
(1) a feeding device;
(2) a twin-screw hybrid heating device comprising in order in the transverse direction:
the material feeding area is provided with a material feeding area,
a mixing and dispersing area is arranged in the mixing and dispersing area,
a pre-heating zone, wherein the pre-heating zone is provided with a plurality of pre-heating zones,
the heating zone comprises a first heating section, a second heating section and a third heating section in sequence in the transverse direction,
wherein the feeding zone, the mixing and dispersing zone, the preheating zone and the heating zone comprise coaxial double-screw structures;
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 auxiliary agent adding device is quantitatively added by adopting a quantitative pump, is arranged in the mixing and dispersing area, and is communicated with the inside of the mixing and dispersing area; and
(4) the heat preservation foaming device, the heat preservation foaming device set up in the third heating section, just the inside of heat preservation foaming device with the inside UNICOM of third heating section.
According to another aspect of the present invention, there is provided a method for preparing an ultralight material by foaming expandable microspheres using the ultralight material preparation system, the method comprising the steps of:
feeding: adding the microsphere filter cake into the feeding device, and conveying the microsphere filter cake to a feeding area of the double-screw mixing and heating device;
mixing and dispersing: conveying the microsphere filter cake from the feeding area to the mixing and dispersing area, and simultaneously adding a surface treating agent to the mixing and dispersing area through the auxiliary agent adding device, so that the microsphere filter cake and the surface treating agent are mixed to obtain microsphere wet powder;
preheating: conveying the wet microsphere powder from the mixing and dispersing zone to the preheating zone, and preheating and further mixing and dispersing the wet microsphere powder in the preheating zone;
heating: conveying the wet microsphere powder from a preheating zone to a heating zone, and heating the wet microsphere powder in the heating zone to obtain hot wet microsphere powder;
foaming: and conveying the hot microsphere wet powder to a heat-preservation foaming device from a third heating section of the heating area, adjusting a pressure relief device to relieve pressure, and instantly foaming microspheres in the heat-preservation foaming device.
According to the ultra-light material preparation system, the continuous preparation of the ultra-light material is realized through the combined form of the double-screw mixing and heating device and the heat-preservation foaming device and by adding the surface treating agent, the ultra-light material can be effectively prevented from being bonded in the preparation process, the production efficiency is improved, and the purposes of energy conservation and environmental protection are achieved. On the other hand, the invention also solves the problem of dispersibility of the ultra-light material in use by adding the surface treating agent into the filter cake.
In addition, the invention can prepare the ultra-light material with 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 of the screw, the ultra-light material of the pre-foaming microspheres with different foaming temperatures can be prepared.
The invention improves the reliability and the simplicity of the preparation of the ultra-light material, 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 preparation system and the preparation method well solve the problems that the ultra-light material cannot be continuously operated, is aggregated and agglomerated and the like during preparation. According to the invention, the filter cake can be directly mixed and dispersed, preheated and heated by a screw to foam until the filter cake becomes the ultra-light material with good dispersibility.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention provides a method for directly preparing an ultra-light material by a filter cake through a double-screw mixing heating device and a series device of a heat-insulating foaming device by utilizing the stirring and pushing functions of a screw for the first time, so that the production efficiency of the ultra-light material is greatly improved, the insufficient problem in pre-foaming preparation can be prevented, and continuous preparation is realized.
2. The invention adopts the feeding device with 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 feed the poorly dispersed materials into the double-screw mixing and heating device.
3. According to the invention, the surface treatment agent is coated on the surface of the microsphere in a manner of adding the surface treatment agent, so that the microsphere can be heated efficiently and uniformly, the material can be foamed better, the produced product is not easy to bond, and the dispersibility of the microsphere after foaming can be effectively improved.
4. The quantitative feeding device with the spiral stirring and the continuous double-screw structure can be suitable for preparing the ultra-light material with different foaming temperature intervals and states by controlling the temperature during heating.
Drawings
Fig. 1 is a schematic view of an ultralight material production system according to an embodiment of the present invention.
Fig. 2 is a schematic illustration of a heating zone according to one embodiment of the present invention.
Fig. 3 is a schematic view of an insulating foaming device according to an embodiment of the present invention.
Fig. 4 is a schematic representation of an ultralight material (pre-expanded microspheres) prepared according to one embodiment of the present invention.
Reference numerals
100: filter cake feeding device
200: double-screw mixing and heating device
210: feeding zone
220: mixing and dispersing zone
230: preheating zone
240: heating zone
240-1: first heating section
240-2: second heating section
240-3: third heating section
300: auxiliary agent adding device
400: heat-preservation foaming device
401: input port
402: input valve
403: pressure relief device
404: bath inlet
405: bath liquid outlet
406: discharge port
500: transverse coupling
600: mobile device
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. Ultra-light material preparation system
In one embodiment of the present invention, as shown in fig. 1, there is provided an ultra lightweight material preparation system, comprising:
(1) a feeding device 100;
(2) a twin-screw hybrid heating apparatus 200, the twin-screw hybrid heating apparatus 200 comprising in order in the transverse direction:
the feed zone(s) 210 are,
the mixing and dispersing area 220 is provided with a mixing and dispersing area,
the pre-heating zone 230 is provided,
the heating area 240 is formed by a heating plate,
wherein the heating zone 240 comprises a first heating section 240-1, a second heating section 240-2 and a third heating section 240-3 in sequence in the transverse direction as shown in fig. 2,
wherein the feed zone 210, mixing and dispersing zone 220, preheating zone 230, and heating zone 240 comprise a coaxial twin screw configuration,
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) an auxiliary agent adding device 300, wherein the auxiliary agent adding device 300 is arranged in the preheating zone 230, and the inside of the auxiliary agent adding device 300 is communicated with the inside of the preheating zone 230; and
(4) the heat-preservation foaming device 400 is arranged in the third heating section 240-3, and the interior of the heat-preservation foaming device 400 is communicated with the interior of the third heating section 240-3.
1.1 feeding device
In one embodiment, the feeding device 100 includes a conical feeding hopper, a motor is disposed on the top of the conical feeding hopper, the motor is fixedly connected to a central shaft of the feeding device 100, a conical propeller is disposed on the central shaft, and the conical propeller sequentially decreases in circumferential radius from top to bottom. 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 zone 210 to the feeding device 100 may be a vertical connection, preferably a vertical fixed connection. The feed section 210 may be of a construction with a metal screw for transporting the filter cake fed by the feed device 100.
1.2 double-screw mixing heating device
In one embodiment, in the twin screw mixing and heating apparatus 200,
the feed zone 210 comprises a first twin screw configuration,
the mixing and dispersing zone 220 comprises a second twin-screw configuration,
the preheating zone 230 comprises a third twin-screw configuration,
in the heating zone 240, the first heating section 240-1, the second heating section 240-2, and the third heating section 240-3 include a fourth twin-screw structure,
wherein the twin-screw configuration of each of the feed zone 210, mixing and dispersing zone 220, preheating zone 230, and heating zone 240 is the same or different.
In one embodiment, the interior of the feed zone 210, the interior of the mixing and dispersing zone 220, the interior of the preheating zone 230, and the interior of the heating zone 240 are in communication in the twin screw mixing and heating apparatus 200.
In one embodiment, the temperature of the mixing and dispersing zone 220 and the pre-heating zone 230 may beThe same or different, but below the minimum foaming temperature of the microspheres (the initial foaming temperature T of the microspheres)start)
In the heating area 240 of the heating section,
the first heating section 240-1 is used for heating the microsphere wet powder formed after the filter cake is mixed with the surface treatment agent;
the second heating section 240-2 is used for improving the heating of the microsphere wet powder;
the third heating section 240-3 is used for further improving the heating of the microsphere wet powder; and further conveyed to an input port 401 of the thermal insulation foaming device 400.
Wherein, the set temperatures of the first heating section 240-1, the second heating section 240-2 and the third heating section 240-3 can be the same or different, and the temperature is higher than the minimum foaming temperature of the microspheres (the initial foaming temperature T of the microspheres)start)
In one embodiment, an additive addition device 300 is disposed on the preheating zone 230 of the twin screw mixing and heating device. The connection between the twin-screw mixing and heating device 200 and the auxiliary agent adding device 300 can be a vertical connection, and 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 auxiliary agent hopper is used for adding a surface treatment agent.
The addition of the surface treatment agent can prevent the agglomeration of the expandable microspheres in the later heating stage. The surface treatment agent includes both solid and liquid. The surface treatment agent can effectively prevent agglomeration and surface bonding of the microspheres; the foaming of the microspheres is realized by controlling heating and balance temperature and mixing, the heat conduction effect between the screw and the microsphere wet cake is increased, and the foaming rate of the microspheres is promoted.
In one embodiment, the surface treatment agent is preferably a solid article. The solid product may be talc, calcium carbonate, titanium dioxide, alumina, especially alumina trihydrate, silica, titanium dioxide, zinc oxide, etc. Other materials include spherical or hollow beads of ceramic, quartz or glass. Titanium dioxide is preferably used as the solid product.
The surface treatment agent may be a liquid product, and glycerin, silicone oil, liquid paraffin, a silane coupling agent, polyvinyl alcohol, dimethyl phthalate, an aqueous solution of nekal (30%), or the like may be used. Preferably, glycerol is used as the liquid product.
1.4 thermal insulation foaming device
In one embodiment, as shown in fig. 3, the thermal foaming device 400 is a detachable container, which may be made of plastic or metal, and is connected to the third heating section 240-3 by a flange, and includes:
at least one of the input ports 401,
the input valve (402) is set in the valve,
the pressure relief device 403 is provided in the form of a pressure relief device,
the bath inlet 404 is provided with a bath inlet,
a bath liquid outlet 405, which is provided with a bath liquid outlet,
the discharge port 406 is provided at the discharge port,
the input port 401, the input valve 402, the pressure relief device 403 and the discharge port 406 are communicated with the interior of the heat-preservation foaming device 400; the inner part and the outer part are in a jacket form, and a bath solution inlet 404 and a bath solution outlet 405 are respectively communicated with the inner part of the jacket;
the bath solution can flow in the jacket to adjust the temperature of the heat-insulating foaming device 400.
In one embodiment, the bath may be water, alcohol, silicone oil, preferably water.
1.5 other devices
In one embodiment, the system for preparing ultra-light weight material of the present invention further comprises a transverse coupling 500, wherein the transverse coupling 500 is disposed in the feeding zone and is fixedly connected with the double-screw structural body. The transverse coupler 500 is used for connecting the two double-screw structures through a reduction gear to drive the double screws to rotate.
In one embodiment, the system for preparing ultra-light weight material of the present invention further comprises a moving device 600, which facilitates moving the preparation device at any time according to the production requirement.
2. Method for preparing ultra-light material
The process for producing the ultralight material of the present invention is described in detail below.
According to one embodiment of the invention, the preparation method of the ultralight material comprises the following steps:
feeding: adding a microsphere cake to the feed device 100 and conveying to the feed zone 210 of the twin screw mixing and heating device 200;
mixing and dispersing: conveying the microsphere filter cake from the feeding zone 210 to the mixing and dispersing zone 220, and simultaneously adding a surface treatment agent to the mixing and dispersing zone 220 through the auxiliary agent adding device 300, so that the microsphere filter cake and the surface treatment agent are mixed and dispersed in the mixing and dispersing zone 220, thereby obtaining microsphere wet powder;
preheating: transporting said wet microsphere powder from said mixing and dispersing zone 220 to said preheating zone 230, wherein said wet microsphere powder is preheated and further mixed and dispersed in said preheating zone 230 to form a mixed hot wet microsphere powder;
heating: conveying the mixed wet microsphere powder from the preheating zone 230 to the heating zone 240, and further heating the mixed wet microsphere powder through the first heating section 240-1, the second heating section 240-2 and the third heating section 240-3 to obtain incompletely foamed wet microsphere powder;
foaming: and conveying the incompletely foamed microsphere wet powder from the third heating section 240-3 to the heat-insulating foaming device 400, and completing foaming in the heat-insulating foaming device 400, thereby obtaining the ultra-light material.
2.1 feeding step
In one embodiment, the rotation speed of the conical propeller of the feeding device 100 in the feeding step may be 100 and 150rpm, preferably 90-100 rpm. The feed rate in the conical hopper may be 100 and 200 kg/h. The temperature of the feed section may be room temperature.
2.2 mixing and dispersing step
In one embodiment, in the mixing and dispersing step, the solid content of the obtained wet powder of the mixed hot microspheres can be more than 70%, and preferably 70% -75%.
2.3 preheating step
In one embodiment, the rotational speed of the lateral coupling 500 during the preheating step is 50-100rpm, preferably 80-90rpm, which is matched to the rotational speed of the conical propeller of the feeding device 100. The temperature of the preheating zone 230 can be adjusted according to the microsphere foaming temperature:
for low temperature expanded microspheres, the temperature of the preheating zone may be 60-100 ℃, preferably 70-95 ℃, more preferably 80-90 ℃;
for the high temperature expanded microspheres, the temperature of the preheating zone may be from 120-.
In one embodiment, in the preheating 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 surface treating agent is too high, and further the coating of the surface treating agent on the surface of the microsphere is too little, so that the microsphere is heated unevenly; if the rotation speed is too low, the speed of conveying the wet powder of microspheres is too slow, further the surface treatment agent mixed in the wet powder of microspheres is not uniform, the microspheres are heated for a long time, and the shells are softened to cause mutual adhesion.
In one embodiment, in the preheating step, the surface treatment agent may be mixed with the wet powder of microspheres to prevent the microspheres from blocking during foaming. In addition, the surface treating agent is also beneficial to uniformly heating the microsphere wet powder, and the probability of the microsphere shell being heated and adhered is greatly reduced when the screw rod in the machine barrel is sheared.
2.4 heating step
In one embodiment, in the heating step, the wet powder of microspheres mixed with the surface treatment agent is heated. The mixed wet microsphere powder sequentially passes through the first heating section 240-1, the second heating section 240-2 and the third heating section 240-3 of the heating section 240, so that the mixed wet microsphere powder reaches a sufficient foaming temperature before being conveyed to the heat-insulating foaming device 400.
The invention prevents the microsphere wet powder from being heated unevenly in the heating step by adding the surface treating agent. The surface treatment agent includes a solid product and a liquid product. Solid articles are preferred for heat transfer and ease of handling. Specific examples of the solid product and the liquid product are as described above.
In one embodiment, in the heating step, the temperatures of the first heating section 240-1, the second heating section 240-2, and the third heating section 240-3 may be the same or different, and are all higher than the minimum foaming temperature of the microspheres.
Specifically, the temperature of the heating zone 240 may be based on the T of the microsphere foamingstartAnd (4) selecting. In principle, the temperature of the heating zone 240 is compared to the T of the microspheresstartThe height is 20-50 ℃.
For low temperature expanded microspheres, the temperature of the heating zone 240 may be 120-170 ℃, preferably 140-160 ℃, more preferably 140-150 ℃.
For high temperature expanded microspheres, the temperature of the heating zone 240 may be 170-.
2.5 foaming step
In one embodiment, the method further comprises, after the heating step: conveying the mixed wet hot microsphere powder from the heating area 240 to a heat-preservation foaming device 400 for foaming, and collecting the obtained ultra-light material (pre-foaming microspheres) from a discharge hole 406;
wherein, the pressure in the heat-insulating foaming device 400 can be adjusted by the pressure relief device 403, the pressure in the heat-insulating foaming device 400 is 0.1-0.5Mpa, the foaming pressure can be selected according to the actual requirement, generally, the foaming pressure is preferably 0.1-0.2Mpa for sufficient foaming;
wherein the bath liquid is selected from water, and the bath liquid temperature can be 25-70 deg.C, preferably 25-50 deg.C, preferably 30-40 deg.C;
particularly, the foaming of the microspheres is collected through 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 ultralight material production system shown in fig. 1, and the method includes the steps of:
(1) firstly, a microsphere filter cake WU1501 (wherein the microspheres are low-temperature microspheres) is added into a conical feeding hopper of a feeding device 100 (Honggao machinery Co., Ltd., PSA), the feeding speed is 200kg/h, and the rotating speed of a vertical feeding screw device in the feeding device 100 is 50 rpm.
The microsphere filtercake WU1501 is then fed into the feed zone 210 of the twin screw compounding heating apparatus 200. The rotational speed of the cross coupling 500 (from taixin precision plastic machinery, ltd) fixedly attached to the twin-screw body of the twin-screw structure of the twin-screw hybrid heating apparatus 200 was 50 rpm.
(2) The microsphere filter cake is then transported from the feed zone 210 to the mixing and dispersing zone 220 (at 100 deg.C), where heating of the filter cake is accomplished by the action of the screws in the mixing and dispersing zone 220, forming a hot filter cake.
(3) The hot filter cake was introduced into the preheating zone 230 by the screw in the preheating zone 230, and at the same time, a silicone oil surface treatment agent (Shanghai Aladdin Biotechnology Co., Ltd.) was added to the preheating zone 230 from the auxiliary agent adding apparatus 300 in an amount of 0.3kg/h to obtain a hot wet powder.
(4) The hot, moist powder is conveyed from the preheating zone 230 to a first heating section 240-1 (at 120 ℃) of a heating zone 240, wherein as the microsphere shell softens, adhesion of the surface treatment agent to the microsphere surface is caused; and then, passing the hot and wet powder through a second heating section 240-2 (at a temperature of 130 ℃) and a third heating section 240-3 (at a temperature of 140 ℃) in sequence to obtain the incompletely foamed mixed hot and wet powder.
(5) And conveying the incompletely foamed mixed hot and wet powder to a heat-insulating foaming device 400, foaming to obtain pre-foamed ultra-light material (pre-foamed microspheres) with good dispersibility, and finally collecting the pre-foamed ultra-light material at a discharge hole 406 of the heat-insulating foaming device 400.
Thereby, the continuous preparation of the ultra-light material (pre-expanded microsphere) is realized by using the equipment better.
Example 2
The process flow of example 2 is substantially the same as that of example 1, except that:
in the step (1), a filter cake WU608 (wherein the microspheres are high-temperature microspheres) is added into a conical feeding hopper of the feeding device 100, the feeding speed is 250kg/h, and the rotating speed of a vertical feeding screw device in the feeding device 100 is 40 rpm;
in the step (2), the temperature of the mixing and dispersing area 220 is 120 ℃;
in the step (3), the surface treatment agent from the auxiliary agent adding device 300 is glycerol (Shanghai Aladdin Biotechnology Co., Ltd.) with an addition amount of 0.3 kg/h;
in step (4), the hot and wet powder is conveyed from the preheating zone 230 to the first heating section 240-1 (at 140 ℃) of the heating zone 240, wherein the surface treatment agent is adhered to the surface of the microspheres as the microsphere shells are softened; and then the hot wet powder passes through a second heating section 240-2 (the temperature is 150 ℃) and a third heating section 240-3 (the temperature is 160 ℃) in turn.
Finally, the ultra-light material (pre-expanded microspheres) which was sufficiently expanded and had good dispersibility was obtained in the heat-insulating foaming apparatus 400, as shown in fig. 4.
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 (16)
1. An ultralight material production system, comprising:
(1) a feeding device;
(2) a twin-screw hybrid heating device comprising in order in the transverse direction:
the material feeding area is provided with a material feeding area,
a mixing and dispersing area is arranged in the mixing and dispersing area,
a pre-heating zone, wherein the pre-heating zone is provided with a plurality of pre-heating zones,
the heating zone comprises a first heating section, a second heating section and a third heating section in sequence in the transverse direction,
wherein the feeding zone, the mixing and dispersing zone, the preheating zone and the heating zone comprise coaxial double-screw structures,
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 auxiliary agent adding device is arranged in the mixing and dispersing area, and the interior of the auxiliary agent adding device is communicated with the interior of the mixing and dispersing area; and
(4) the heat preservation foaming device, the heat preservation foaming device set up in the third heating section, just the inside of heat preservation foaming device with the inside UNICOM of third heating section.
2. The ultra lightweight material preparation system according to 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 from top to bottom in circumferential radius.
3. The ultra lightweight material preparation system according to claim 1,
in the twin-screw mixing and heating apparatus,
the feed zone comprises a first twin screw configuration,
the mixing and dispersing zone comprises a second double screw structure,
the preheating zone comprises a third twin-screw configuration,
in the heating zone, the first heating section, the second heating section, and the third heating section comprise a fourth twin screw structure,
wherein the feeding zone, the mixing and dispersing zone, the preheating zone and the heating zone respectively comprise the same or different twin-screw structures.
4. The ultra lightweight material preparation system according to claim 1,
in the twin-screw mixing and heating apparatus,
the interior of the feed zone, the interior of the mixing and dispersing zone, the interior of the preheating zone, and the interior of the heating zone are in communication.
5. The ultra lightweight material preparation system according to claim 1,
the temperature of the mixing and dispersing zone and the preheating zone are the same or different and are both lower than the minimum foaming temperature of the microspheres.
6. The ultra lightweight material preparation system according to claim 1,
in the said heating zone, the heating zone is,
the temperatures of the first heating section, the second heating section and the third heating section are the same or different and are all higher than the lowest foaming temperature of the microspheres.
7. The ultra lightweight material preparation system according to claim 1,
the auxiliary agent adding device quantitatively adds auxiliary agent by using a quantitative pump.
8. The ultra lightweight material preparation system according to claim 1,
the auxiliary agent adding device is an auxiliary agent hopper, and a coupler for improving the feeding speed exists in the auxiliary agent hopper.
9. The ultra lightweight material preparation system according to claim 1,
the foaming device that keeps warm is the container that can freely dismantle, with the heating zone with there is flange joint between the third heating section, it includes:
an input port for receiving a fluid to be delivered,
an input valve is arranged on the upper portion of the shell,
a pressure relief device for relieving the pressure of the air conditioner,
the inlet of the bath liquid is provided with a bath liquid inlet,
a bath liquid outlet,
a discharge hole is arranged on the bottom of the container,
wherein the input port, the input valve, the pressure relief device and the discharge port are communicated with the interior of the heat-preservation foaming device,
a jacket is arranged between the inside and the outside of the heat-preservation foaming device, the bath liquid inlet and the bath liquid outlet are respectively communicated with the inside of the jacket, and
the bath liquid flows in the jacket to realize the temperature regulation of the heat-preservation foaming device.
10. The ultra lightweight material preparation system according to claim 1,
the ultralight material preparation system further comprises a transverse coupler, wherein the transverse coupler is arranged in the feeding area and is fixedly connected with the double-screw structure body.
11. The method for producing an ultralight material according to any one of claims 1 to 10, characterized by comprising the steps of:
feeding: adding a microsphere filter cake to the feeding device and conveying to the feeding zone of the twin-screw mixing and heating device;
mixing and dispersing: conveying the microsphere filter cake from the feeding zone to the mixing and dispersing zone, and simultaneously adding a surface treatment agent to the mixing and dispersing zone through the auxiliary agent adding device, so that the microsphere filter cake and the surface treatment agent are mixed and dispersed in the mixing and dispersing zone, thereby obtaining microsphere wet powder;
preheating: conveying the wet microsphere powder from the mixing and dispersing zone to the preheating zone, and preheating the wet microsphere powder in the preheating zone and further mixing and dispersing to form mixed hot wet microsphere powder;
heating: conveying the mixed wet microsphere powder from the preheating zone to the heating zone, and further heating the mixed wet microsphere powder through the first heating section, the second heating section and the third heating section to obtain incompletely foamed wet microsphere powder;
foaming: and conveying the incompletely foamed microsphere wet powder to the heat-insulating foaming device from the third heating section, and completing foaming in the heat-insulating foaming device, thereby obtaining the ultralight material.
12. The method of claim 11,
the rotating speed of the conical propeller of the feeding device is 100-150rpm, and the feeding speed of the microsphere filter cake is 100-200 kg/h.
13. The method of claim 11,
in the mixing and dispersing step, the solid content of the microsphere wet powder is more than 70%.
14. The method of claim 11,
in the step of pre-heating,
adjusting the temperature of the preheating zone according to the foaming temperature of the microspheres:
for low temperature foaming microspheres, the temperature of the preheating zone is 60-100 ℃,
for the high-temperature foaming microspheres, the temperature of the preheating zone is 120-180 ℃.
15. The method of claim 11,
in the step of heating, the heating step is carried out,
the temperatures of the first heating section, the second heating section and the third heating section are the same or different and are all higher than the lowest foaming temperature of the microspheres, wherein
For the low-temperature foaming microsphere, the temperature of the heating zone is 120-170 ℃,
for the high-temperature foaming microspheres, the temperature of the heating zone is 170-250 ℃.
16. The method of claim 11,
in the step of foaming,
the pressure in the heat-preservation foaming device is adjusted through the pressure relief device, and the pressure in the heat-preservation foaming device is 0.1-0.5Mpa
The bath liquid is water, alcohol or silicone oil, and the temperature of bath liquid is 25-70 deg.C.
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