CN110860260A - System and method for continuous preparation of ultra-lightweight materials - Google Patents

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

System and method for continuous preparation of ultra-lightweight materials

technical field

The invention relates to a continuous preparation system for ultra-lightweight materials, and also relates to a method for preparing ultra-lightweight materials by using the system.

Background technique

The ultra-lightweight material is a hollow plastic microsphere filler with a density of 0.015-0.3Kg/m ³ prepared by heating and foaming the foamable microspheres, and its diameter is 10 to 500um.

Expandable microspheres are plastic particles synthesized by suspension polymerization, consisting of an airtight outer shell and a sealed foaming agent. Irreversible foaming occurs when the microspheres are heated, resulting in pre-foamed microspheres (ultra-lightweight materials). As a lightweight filler, ultra-lightweight materials are widely used in aerospace, high-speed rail, automotive and other industrial fields, coatings, thermal insulation materials and sealing materials. The automotive industry uses ultra-lightweight materials in underbody coatings, tires, composites and adhesives.

The synthesis and foaming technology of microspheres has been reported in US3615972, EP486080, EP566367, CN201610792097.3, CN201510483687.3, CN201280073857.5, CN2012100109302.3 and other patents. Due to the differences in the synthesis process, the microspheres can be divided into low temperature, medium high temperature, high temperature and ultra-high temperature microspheres according to the foamable temperature range of the microspheres. Cresire Technology (Shanghai) Co., Ltd. can provide various forms of foamable microspheres in dry powder and filter cake, including foamed and unfoamed forms, among which two types of microspheres are low temperature WU1501 and high temperature DU608 most famous.

The unfoamed form and the foamed form of the foamable microspheres are sold in the market, but due to the low density of the foamed microspheres (ultra-light materials), they are ultra-light powders, and their production, transportation and sales are more expensive. Due to the inconvenience, the user generally prepares the foamed microspheres on site, that is, the filter cake of the foamable microspheres in the unfoamed form is purchased and added to the production equipment for the continuous preparation of the final product.

After collecting the foamable microspheres from the aqueous phase, a filter cake was obtained by dehydration and further drying to form a free-flowing dispersible powder. Since the spheres are temperature sensitive (depending on the softening point of the polymer shell wall), high temperature evaporative drying cannot usually be used to remove moisture in time. Furthermore, since the aqueous slurry contains many contaminants and additives from the suspension polymerization process, it tends to aggregate and agglomerate when dewatered to form a filter cake, resulting in failure to obtain well-dispersed pre-foamed microspheres in the end.

Many patents refer to drying methods and apparatuses for foaming microsphere foaming agents. For example, US Pat. Nos. 8,247,465 and 8,329,298 all mention the step of adhering particulate fillers on the outer surface of the microsphere shell, and the particulate filler adhering to the outer surface of the microsphere shell helps to improve the dispersion of the microspheres during drying However, this operation requires a lot of 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 can effectively prevent the microsphere foaming agent from foaming during the foaming process by setting a turbulent flow device, an open cylinder structure and an arc-shaped converging section However, the production efficiency is low, the operability is poor, and the equipment utilization rate is low, and the production process of pre-foamed microspheres in different temperature ranges cannot be adjusted at any time. CN105150494A proposes a device and method for continuous preparation of ultra-light fillers, which solves the problems of bridging, clogging and poor fluidity of raw materials during feeding. The twin-screw is used to realize the continuous preparation of ultra-light dry powder from wet cake. quality filler. However, the devices and methods mentioned in the above-mentioned patents are to further heat and foam the wet cake with low water content to prepare ultra-lightweight materials, and these devices and methods have insufficient agglomeration and foaming when heating the foamed microsphere filter cake. The problem is not resolved.

Therefore, there is an urgent need for a continuous production system and method of ultra-lightweight materials that can overcome the above-mentioned disadvantages.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a system for preparing ultra-lightweight materials and a method for preparing ultra-lightweight materials by using the system, which can realize the continuous preparation of ultra-lightweight materials and effectively prevent the occurrence of The foamed microspheres are bonded to each other during the heating and foaming process.

In order to achieve the above object, according to one aspect of the present invention, an ultra-lightweight material preparation system is provided, comprising:

(1) Feeding device;

(2) twin-screw mixing and heating device, the twin-screw mixing and heating device sequentially comprises:

feed area,

mixed dispersion zone,

preheat zone,

a heating zone, the heating zone comprises a first heating section, a second heating section and a third heating section in sequence in the lateral direction,

Wherein, the feeding zone, mixing and dispersing zone, preheating zone, and heating zone comprise coaxial twin-screw structures;

Wherein, the feeding device is arranged in the feeding zone, and the interior of the feeding device communicates with the interior of the feeding zone;

(3) an auxiliary agent adding device, which is quantitatively added by a quantitative pump, the auxiliary agent addition device is arranged in the mixing and dispersing zone, and the interior of the auxiliary agent adding device is communicated with the interior of the mixing and dispersing zone; and

(4) A thermal insulation foaming device, the thermal insulation foaming device is arranged in the third heating section, and the interior of the thermal insulation foaming device communicates with the interior of the third heating section.

According to another aspect of the present invention, there is provided a method for preparing an ultra-lightweight material by foaming foamable microspheres using the above-mentioned ultra-lightweight material preparation system, the method comprising the following steps:

Feeding: adding the microsphere filter cake to the feeding device and transporting it to the feeding area of the twin-screw mixing and heating device;

Mixing and dispersing: the microsphere filter cake is transported from the feeding area to the mixing and dispersing area, and at the same time, a surface treatment agent is added to the mixing and dispersing area through the auxiliary agent adding device, so that the microsphere filter cake is Mixing with the surface treatment agent to obtain microsphere wet powder;

Preheating: the microsphere wet powder is transported from the mixing and dispersing zone to the preheating zone, where the microsphere wet powder is preheated and further mixed and dispersed;

Heating: the microsphere wet powder is transported from the preheating zone to the heating zone, and the microsphere wet powder is heated in the heating zone to obtain hot microsphere wet powder;

Foaming: the hot microsphere wet powder is transported from the third heating section of the heating zone to the thermal insulation foaming device, and the pressure relief device is adjusted to relieve pressure at the same time, and the microspheres are instantly foamed in the thermal insulation foaming device.

The ultra-lightweight material preparation system of the present invention realizes the continuous preparation of ultra-lightweight materials through the combined form of a twin-screw mixing heating device and a thermal insulation foaming device, and by adding a surface treatment agent, and can effectively prevent ultra-lightweight materials. Bonding in the preparation process improves production efficiency and achieves the purpose of energy saving and environmental protection at the same time. On the other hand, by adding a surface treatment agent to the filter cake, the present invention also solves the problem of the dispersibility of the ultra-lightweight material during use.

In addition, the present invention can prepare ultra-lightweight materials with different foaming temperature ranges and states by adopting a quantitative feeding device of helical stirring and a continuous twin-screw structure. By controlling the temperature of the screw, ultra-lightweight materials of pre-foamed microspheres with different foaming temperatures can be prepared.

The invention improves the reliability and simplicity of the preparation of the ultra-lightweight material, effectively improves the operation efficiency, is convenient for processing, has low cost, and is favorable for realizing mass production.

Compared with the prior art, the preparation system and method of the present invention well solve the problems of inability to continuously operate, agglomeration and agglomeration during the preparation of ultra-lightweight materials. According to the present invention, the filter cake can be directly mixed and dispersed by the screw, preheated, heated and foamed until finally it becomes an ultra-light material with good dispersibility.

The present invention has the following advantages and effects with respect to the prior art:

1. The present invention utilizes the stirring and pushing action of the screw for the first time, and provides a method for directly preparing ultra-light materials from filter cake through the above-mentioned device by designing a series device of a twin-screw mixing heating device and a thermal insulation foaming device. The production efficiency of ultra-lightweight materials is greatly improved, which can prevent the insufficient problem of pre-foaming preparation and realize continuous preparation.

2. The present invention solves the problems of clogging and bridging when the raw materials are unloaded by adopting the feeding device of spiral stirring, and can continuously, uniformly and stably feed the poorly dispersed materials into the twin-screw mixing and heating device. .

3. In the present invention, by adding a surface treatment agent, the surface treatment agent is coated on the surface of the microspheres, which is convenient for efficient and uniform heating, so that the material can be foamed better, and the produced product is not easy to bond, which can Effectively improve the dispersion of microspheres after foaming.

4. The screw stirring quantitative feeding device and the continuous twin-screw structure in the present invention can make the present invention suitable for the preparation of ultra-lightweight materials with different foaming temperature ranges and states by controlling the temperature during heating.

Description of drawings

FIG. 1 is a schematic diagram of an ultra-lightweight material preparation system according to an embodiment of the present invention.

Figure 2 is a schematic diagram of a heating zone according to one embodiment of the present invention.

3 is a schematic diagram of a thermal insulation foaming device according to an embodiment of the present invention.

4 is a schematic diagram of an ultra-lightweight material (pre-foamed microspheres) prepared according to one embodiment of the present invention.

reference number

100: filter cake feeding device

200: Twin screw mixing heating device

210: Feeding area

220: Mixed Dispersion Zone

230: Preheat zone

240: Heating zone

240-1: The first heating section

240-2: Second heating section

240-3: The third heating section

300: Auxiliary Additive Device

400: Thermal insulation foaming device

401: Input port

402: Input valve

403: Pressure relief device

404: Bath inlet

405: Bath outlet

406: Outlet

500: Lateral coupling

600: Mobile Device

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

1. Ultra-lightweight material preparation system

In one embodiment of the present invention, as shown in FIG. 1, an ultra-lightweight material preparation system is provided, which includes:

(1) Feeding device 100;

(2) The twin-screw mixing and heating device 200, the twin-screw mixing and heating device 200 sequentially includes:

feed zone 210,

Mixing and dispersing zone 220,

preheat zone 230,

heating zone 240,

Wherein, as shown in FIG. 2, the heating zone 240 includes a first heating section 240-1, a second heating section 240-2 and a third heating section 240-3 in sequence in the lateral direction,

Wherein, the feeding zone 210, the mixing and dispersing zone 220, the preheating zone 230 and the heating zone 240 comprise coaxial twin-screw structures,

Wherein, the feeding device 100 is disposed in the feeding area 210, and the interior of the feeding device 100 communicates with the interior of the feeding area 210;

(3) an auxiliary agent addition device 300, the auxiliary agent addition device 300 is disposed in the preheating zone 230, and the interior of the auxiliary agent addition device 300 communicates with the interior of the preheating zone 230; and

(4) The thermal insulation foaming device 400, the thermal insulation foaming device 400 is arranged in the third heating section 240-3, and the interior of the thermal insulation foaming device 400 and the interior of the third heating section 240-3 Unicom.

1.1 Feeding device

In one embodiment, the feeding device 100 includes a conical feeding hopper, and a motor is provided on the top of the conical feeding hopper, and the motor is fixedly connected with the central shaft of the feeding device 100, and the central shaft is provided with a motor. There are conical propellers whose circumferential radius decreases sequentially from top to bottom. By adopting the feeding device with spiral stirring, the problems of clogging and bridging when the raw materials are unloaded are well solved, so that the poorly dispersed materials can enter the drying device continuously, uniformly and stably.

In one embodiment, the connection between the feeding zone 210 and 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 filter cake added by the feeding device 100 .

1.2 Twin-screw mixing heating device

In one embodiment, in the twin-screw mixing heating device 200,

The feed zone 210 includes a first twin screw structure,

The mixing and dispersing zone 220 includes a second twin-screw structure,

The preheating zone 230 includes a third twin screw structure,

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,

The twin screw structures included in the feeding zone 210 , the mixing and dispersing zone 220 , the preheating zone 230 , and the heating zone 240 are the same or different.

In one embodiment, in the twin-screw mixing and heating device 200 , the interior of the feeding 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 Internally connected.

In one embodiment, the temperature of the mixing and dispersing zone 220 and the preheating zone 230 may be the same or different, but need to be lower than the minimum foaming temperature of the microspheres (the starting foaming temperature of the microspheres T _start )

In the heating zone 240,

The first heating section 240-1 is used to heat the microsphere wet powder formed after the filter cake is mixed with the surface treatment agent;

The second heating section 240-2 is used to improve the heating of the microsphere wet powder;

The third heating section 240 - 3 is used to further improve the heating of the wet microsphere powder;

Wherein, the setting temperature 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 the temperature needs to be higher than the minimum foaming temperature of the microspheres ( Microsphere start foaming temperature T _start )

In one embodiment, an auxiliary agent adding device 300 is provided 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 may be a vertical connection, preferably a vertical fixed connection.

1.3 Auxiliary Additive Device

The auxiliary agent adding device 300 may be an auxiliary agent hopper. A coupling for increasing the feeding speed may be present in the auxiliary hopper. The auxiliary hopper is used for adding surface treatment agent.

The addition of the surface treatment agent can prevent the foamable microspheres from agglomerating in the later heating stage. There are two kinds of surface treatment agents: solid and liquid. The surface treatment agent can effectively prevent the agglomeration and surface bonding of the microspheres; the foaming of the microspheres can be achieved by controlling the heating and equilibrium temperature and mixing, increasing the heat conduction effect between the screw and the wet cake of the microspheres, and promoting the foaming rate of the microspheres.

In one embodiment, the surface treatment agent is preferably a solid product. For solid products, talc, calcium carbonate, titanium dioxide, alumina, especially alumina trihydrate, silica, titania, zinc oxide, etc. can be used. Other materials include spherical or hollow beads of ceramic, quartz or glass. Titanium dioxide is preferably used as a solid product.

The surface treatment agent can also be a liquid product, such as glycerin, silicone oil, liquid paraffin, silane coupling agent, polyvinyl alcohol, dimethyl phthalate, and aqueous solution (30%) of pulling powder. Glycerol is preferably used as a liquid preparation.

1.4 Thermal insulation foaming device

In one embodiment, as shown in FIG. 3 , the thermal insulation foaming device 400 is a freely detachable container, which can be made of plastic or metal, and is connected with the third heating section 240-3 by a flange, which includes :

Input port 401,

input valve 402,

pressure relief device 403,

bath inlet 404,

Bath outlet 405,

Outlet 406,

The input port 401, the input valve 402, the pressure relief device 403, and the discharge port 406 are connected to the inside of the thermal insulation foaming device 400; the inside and the outside are in the form of a jacket, and the bath liquid inlet 404 and the bath liquid outlet 405 are respectively connected with the clamp. set internal communication;

The bath liquid can flow in the jacket to achieve temperature adjustment of the thermal insulation foaming device 400 .

In one embodiment, the bath can be water, alcohol, silicone oil, preferably water as the bath.

1.5 Other devices

In one embodiment, the ultra-lightweight material preparation system of the present invention further includes a transverse coupling 500, which is arranged in the feeding zone and is fixedly connected with the twin-screw structure body. The transverse coupling 500 is used to connect two twin screw structures through a reduction gear, so as to drive the twin screws to rotate.

In one embodiment, the ultra-lightweight material preparation system of the present invention further includes a moving device 600, so that the preparation device can be moved at any time according to production requirements.

2. Method for the preparation of ultra-lightweight materials

The preparation method of the ultra-lightweight material of the present invention will be described in detail below.

According to one embodiment of the present invention, the preparation method of the ultra-lightweight material of the present invention comprises the following steps:

Feeding: adding the microsphere filter cake into the feeding device 100 and transporting it to the feeding zone 210 of the twin-screw mixing and heating device 200;

Mixing and dispersing: the microsphere filter cake is transported from the feeding area 210 to the mixing and dispersing area 220, and at the same time, a surface treatment agent is added to the mixing and dispersing area 220 through the auxiliary agent adding device 300, so that the The microsphere filter cake and the surface treatment agent are mixed and dispersed in the mixing and dispersing zone 220, thereby obtaining the microsphere wet powder;

Preheating: the microsphere wet powder is transported from the mixing and dispersing zone 220 to the preheating zone 230, where the microsphere wet powder is preheated and further mixed and dispersed to form a preheating zone 230. Mixed hot microsphere wet powder;

Heating: the mixed hot microsphere wet powder is transported from the preheating zone 230 to the heating zone 240, and passes through the first heating section 240-1, the second heating section 240-2 and the third heating section 240-3 further heating the mixed hot microsphere wet powder to obtain an incompletely foamed microsphere wet powder;

Foaming: the incompletely foamed microsphere wet powder is transported from the third heating section 240-3 to the thermal insulation foaming device 400, and foaming is completed in the thermal insulation foaming device 400, thereby obtaining The ultra-lightweight material.

2.1 Feeding steps

In one embodiment, in the feeding step, the rotational speed of the conical propeller of the feeding device 100 may be 100-150 rpm, preferably 90-100 rpm. The feeding rate in the conical hopper can be 100-200 kg/h. The temperature of the feed section may be room temperature.

2.2 Mixing and dispersing steps

In one embodiment, in the mixing and dispersing step, the solid content of the obtained mixed thermal microsphere wet powder may be more than 70%, preferably 70%-75%.

2.3 Preheating step

In one embodiment, in the preheating step, the rotational speed of the transverse coupling 500 is 50-100 rpm, preferably 80-90 rpm, which is to match 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 foamed microspheres, the temperature of the preheating zone may be 60-100°C, preferably 70-95°C, more preferably 80-90°C;

For high temperature foamed microspheres, the temperature of the preheating zone may be 120-180°C, preferably 150-175°C, more preferably 160-170°C.

In one embodiment, in the preheating step, the rotational speed of the transverse coupling 500 may be set according to actual operating conditions. If the rotation speed is too large, the mixing speed of the wet microsphere powder and the surface treatment agent will be too fast, which will further lead to too little coating of the surface treatment agent on the surface of the microspheres, resulting in uneven heating of the microspheres; if the rotation speed is too small, it will lead to transportation The speed of the microsphere wet powder is too slow, which further leads to the uneven surface treatment agent mixed in the microsphere wet powder, and the microspheres are heated for a long time, causing the shell to soften and cause mutual bonding.

In one embodiment, in the preheating step, after the surface treatment agent is mixed with the wet microsphere powder, the microspheres can be prevented from sticking during the foaming process. In addition, the surface treatment agent also helps the microsphere wet powder to be heated evenly. Under the shearing of the screw in the barrel, the probability of the microsphere shell being heated and sticking is greatly reduced.

2.4 Heating step

In one embodiment, in the heating step, the microsphere wet powder mixed with the surface treatment agent is heated. The mixed microsphere wet powder passes through the first heating section 240-1, the second heating section 240-2 and the third heating section 240-3 of the heating zone 240 in turn, so that the mixed microsphere wet powder is transported to the thermal insulation foaming device. 400 before reaching a sufficient foaming temperature.

The present invention prevents uneven heating of the microsphere wet powder in the heating step by adding a surface treatment agent. The surface treatment agent includes solid products and liquid products. Solid articles are preferred from the standpoint of heat transfer and simplicity of operation. Specific examples of the solid product and 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, all higher than Minimum foaming temperature for microspheres.

Specifically, the temperature of the heating zone 240 may be selected according to the T _start of the foaming of the microspheres. In principle, the temperature of the heating zone 240 is 20-50°C higher than the T _start of the microspheres.

For low temperature foamed microspheres, the temperature of the heating zone 240 may be 120-170°C, preferably 140-160°C, more preferably 140-150°C.

For high temperature foamed microspheres, the temperature of the heating zone 240 may be 170-250°C, preferably 170-200°C, more preferably 180-190°C.

2.5 Foaming step

In one embodiment, after the heating step, the method further includes: conveying the mixed hot microsphere wet powder from the heating zone 240 to the thermal insulation foaming device 400 for foaming, and collecting from the discharge port 406 The resulting ultra-lightweight material (pre-foamed microspheres);

Among them, the pressure in the thermal insulation foaming device 400 can be adjusted by the pressure relief device 403, and the pressure in the thermal insulation foaming device 400 is 0.1-0.5Mpa, and the foaming pressure can be selected according to actual needs. Foam, the foaming pressure is preferably 0.1-0.2Mpa;

Wherein, the bath is water, and the temperature of the bath can be 25-70°C, preferably 25-50°C, preferably 30-40°C;

In particular, the foamed microspheres are collected through a sealed thermal insulation foaming device that can be disassembled at any time, thereby reducing the dust pollution of the powder.

Example 1

Using the ultra-lightweight material preparation system shown in FIG. 1 to implement the method of this embodiment, the method includes the following steps:

(1) First, add microsphere filter cake WU1501 (wherein the microspheres are low-temperature microspheres) into the conical hopper of the feeding device 100 (Hongyu Machinery Co., Ltd., PSA), and the feeding speed is 200kg/h, so The rotating speed of the vertical feeding screw device in the feeding device 100 is 50 rpm.

The microsphere filter cake WU1501 is then transported to the feed zone 210 of the twin-screw mixing and heating device 200 . The rotational speed of the transverse coupling 500 (from Taixin Precision Plastic Machinery Co., Ltd.) fixedly connected with the twin screw body of the twin screw structure of the twin screw mixing heating device 200 is 50 rpm.

(2) The microsphere filter cake is then transported from the feeding zone 210 to the mixing and dispersing zone 220 (the temperature is 100° C.), and under the action of the screw in the mixing and dispersing zone 220, the heating of the filter cake is completed , forming a hot cake.

(3) Under the push of the screw in the preheating zone 230, the hot filter cake enters the preheating zone 230, and at the same time, the silicone oil surface treatment agent (Shanghai Aladdin Biochemical Co., Ltd.) is added to the preheating zone 230 from the auxiliary agent adding device 300. Technology Co., Ltd.), the addition amount is 0.3kg/h, and the hot wet powder is obtained.

(4) The hot wet powder is transported from the preheating zone 230 to the first heating section 240-1 of the heating zone 240 (the temperature is 120° C.), where as the shell of the microspheres is softened, the surface of the microspheres adheres to the surface treatment agent; then pass the hot and wet powder through the second heating section 240-2 (temperature is 130 ° C) and the third heating section 240-3 (temperature is 140 ° C) in turn to obtain incompletely foamed mixed hot and wet powder .

(5) The incompletely foamed mixed hot and wet powder is transported to the thermal insulation foaming device 400 to obtain pre-foamed and well-dispersed ultra-lightweight materials (pre-foamed microspheres) after foaming. The material is collected at the discharge port 406 of the thermal insulation foaming device 400 .

The continuous production of ultra-lightweight materials (pre-foamed microspheres) is thus preferably achieved using the above-mentioned equipment.

Example 2

The technological process of embodiment 2 is basically the same as the technological process of embodiment 1, and the difference is:

In step (1), filter cake WU608 (wherein the microspheres are high temperature microspheres) is added into the conical hopper of the feeding device 100, the feeding speed is 250kg/h, and the vertical feeding screw in the feeding device 100 The speed of the device is 40rpm;

In step (2), the temperature of the mixing and dispersing zone 220 is 120°C;

In step (3), the surface treatment agent from the self-agent adding device 300 is glycerol (Shanghai Aladdin Biochemical Technology Co., Ltd.), and the addition amount is 0.3kg/h;

In step (4), the hot wet powder is transported from the preheating zone 230 to the first heating section 240-1 (the temperature is 140° C.) of the heating zone 240, wherein as the shell of the microspheres is softened, the The surface treatment agent is adhered to the surface of the ball; then the hot wet powder is passed through the second heating section 240-2 (temperature is 150°C) and the third heating section 240-3 (temperature is 160°C) in sequence.

Finally, an ultra-lightweight material (pre-foamed microspheres) with sufficient foaming and good dispersibility is obtained in the thermal insulation foaming device 400 , as shown in FIG. 4 .

The above descriptions are merely preferred embodiments of the present invention, and it should be understood that the present invention is not limited to the specific embodiments described above. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (16)

1. An ultra-lightweight material preparation system, comprising: (1) Feeding device; (2) twin-screw mixing and heating device, the twin-screw mixing and heating device sequentially comprises: feed area, mixed dispersion zone, preheat zone, a heating zone, the heating zone comprises a first heating section, a second heating section and a third heating section in sequence in the lateral direction, Wherein, the feeding zone, the mixing and dispersing zone, the preheating zone, and the heating zone comprise a coaxial twin-screw structure, Wherein, the feeding device is arranged in the feeding zone, and the interior of the feeding device communicates with the interior of the feeding zone; (3) an auxiliary agent adding device, the auxiliary agent adding device is arranged in the mixing and dispersing zone, and the interior of the auxiliary agent adding device communicates with the interior of the mixing and dispersing zone; and (4) A thermal insulation foaming device, the thermal insulation foaming device is arranged in the third heating section, and the interior of the thermal insulation foaming device communicates with the interior of the third heating section. 2. The ultra-lightweight material preparation system according to claim 1, characterized in that, The feeding device includes a conical feeding hopper, a motor is provided on the top of the conical feeding hopper, the motor is fixedly connected with the central shaft of the feeding device, and a conical propeller is arranged on the central shaft, so The circular radius of the conical propeller decreases sequentially from top to bottom. 3. The ultra-lightweight material preparation system according to claim 1, wherein, In the twin-screw mixing heating device, The feed zone includes a first twin screw structure, The mixing and dispersing zone includes a second twin-screw structure, The preheating zone includes a third twin screw structure, In the heating zone, the first heating section, the second heating section and the third heating section comprise a fourth twin-screw structure, The twin-screw structures included in the feeding zone, the mixing and dispersing zone, the preheating zone, and the heating zone are the same or different. 4. The ultra-lightweight material preparation system according to claim 1, wherein, In the twin-screw mixing heating device, The interior of the feeding zone, the interior of the mixing and dispersing zone, the interior of the preheating zone, and the interior of the heating zone are communicated. 5. The ultra-lightweight material preparation system according to claim 1, wherein, The temperature of the mixing and dispersing zone and the preheating zone are the same or different, and both are lower than the minimum foaming temperature of the microspheres. 6. The ultra-lightweight material preparation system according to claim 1, wherein, In the heating zone, 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 minimum foaming temperature of the microspheres. 7. The ultra-lightweight material preparation system according to claim 1, wherein, The auxiliary agent adding device adopts a quantitative pump for quantitative addition. 8. The ultra-lightweight material preparation system according to claim 1, wherein, The auxiliary agent adding device is an auxiliary agent hopper, and a coupling for increasing the feeding speed exists in the auxiliary agent hopper. 9. The ultra-lightweight material preparation system according to claim 1, wherein, The thermal insulation foaming device is a freely detachable container, and is connected with the third heating section of the heating zone by a flange, which includes: input port, input valve, pressure relief device, bath inlet, bath outlet, outlet, Wherein the input port, input valve, pressure relief device, and discharge port are communicated with the interior of the thermal insulation foaming device, Between the inside and the outside of the thermal insulation foaming device is a jacket, the bath liquid inlet and the bath liquid outlet are respectively communicated with the inside of the jacket, and The bath liquid flows inside the jacket to realize the temperature adjustment of the thermal insulation foaming device. 10. The ultra-lightweight material preparation system according to claim 1, wherein, The ultra-lightweight material preparation system further includes a transverse coupling, which is arranged in the feeding zone and is fixedly connected with the twin-screw structure body. 11. The method for preparing an ultra-lightweight material by the ultra-lightweight material preparation system according to any one of claims 1 to 10, wherein the method comprises the following steps: Feeding: adding the microsphere filter cake to the feeding device and transporting it to the feeding zone of the twin-screw mixing and heating device; Mixing and dispersing: the microsphere filter cake is transported from the feeding area to the mixing and dispersing area, and at the same time, a surface treatment agent is added to the mixing and dispersing area through the auxiliary agent adding device, so that the microsphere filter cake is Mixing and dispersing with the surface treatment agent in the mixing and dispersing zone, thereby obtaining the microsphere wet powder; Preheating: the microsphere wet powder is transported from the mixing and dispersing zone to the preheating zone, where the microsphere wet powder is preheated and further mixed and dispersed to form a mixed heat. Microsphere wet powder; Heating: the mixed thermal microsphere wet powder is transported from the preheating zone to the heating zone, and the mixed thermal microspheres are heated through the first heating section, the second heating section and the third heating section The wet powder is further heated to obtain an incompletely foamed microsphere wet powder; Foaming: transfer the incompletely foamed microsphere wet powder from the third heating section to the thermal insulation foaming device, and complete the foaming in the thermal insulation foaming device, thereby obtaining the ultra-lightweight Material. 12. The method of claim 11, wherein: The rotating speed of the conical propeller of the feeding device is 100-150 rpm, and the feeding speed of the microsphere filter cake is 100-200 kg/hour. 13. The method of claim 11, wherein In the mixing and dispersing step, the solid content of the microsphere wet powder is above 70%. 14. The method of claim 11, wherein: In the preheating step, Adjust the temperature of the preheating zone according to the foaming temperature of the microspheres: For low temperature foamed microspheres, the temperature of the preheating zone is 60-100°C, For high temperature foamed microspheres, the temperature of the preheating zone is 120-180°C. 15. The method of claim 11, wherein In the heating step, 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 minimum foaming temperature of the microspheres, wherein For low temperature foamed microspheres, the temperature of the heating zone is 120-170°C, For high temperature foamed microspheres, the temperature of the heating zone is 170-250°C. 16. The method of claim 11, wherein In the foaming step, The pressure in the thermal insulation foaming device is adjusted by the pressure relief device, and the pressure in the thermal insulation foaming device is 0.1-0.5Mpa, and The bath liquid is water, alcohol or silicone oil, and the temperature of the bath liquid is 25-70℃.

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